Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement: Background and Issues for Congress

Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement: Background and Issues for Congress

Proposed U.S.-Mexico Transboundary
Hydrocarbons Agreement: Background and
Issues for Congress
Curry L. Hagerty
Specialist in Energy and Natural Resources Policy
James C. Uzel
Geospatial Information Systems Analyst
August 29, 2013
Congressional Research Service
7-5700
www.crs.gov
R43204

Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement

Summary
The offshore areas of the Gulf of Mexico provide a setting for domestic and international energy
production, U.S. military training and border operations, trade and commerce, fishing, tourist
attractions, and recreation. These governmental, commercial, and cultural activities depend on
healthy and productive marine and coastal areas for a range of economic and social benefits.
Consequences of hurricanes and oil spills demonstrate that offshore areas in the Gulf of Mexico
are governed by a number of interrelated legal regimes, including treaties and international,
federal, and state laws.
A key congressional interest has been the federal role in managing energy resources in deepwater
areas of the Gulf of Mexico, particularly in waters beyond the U.S. exclusive economic zone
(EEZ), more than 200 miles from shore. In 2012, the United States and Mexico signed an
agreement known as the U.S.-Mexico Transboundary Hydrocarbons Agreement (the Agreement).
This proposed Agreement marks the start of an energy partnership in an area of international
waters that the U.S. Department of the Interior’s (DOI’s) Bureau of Ocean Energy Management
(BOEM) estimates to contain as much as 172 million barrels of oil and 304 billion cubic feet of
natural gas. The main purposes of the partnership would be to lift a moratorium and to jointly
develop reservoirs of oil and natural gas, referred to as “transboundary resources,” that exist in
areas straddling the marine border of both countries. The proposed Agreement stems from a series
of bilateral treaties originating in the 1970s. Like other diplomatic measures, for the proposed
Agreement to take effect, it must be placed before each country’s national lawmakers for review.
To date, Mexico has completed review and accepted the Agreement. The proposed Agreement
awaits review in the U.S. Congress.
In the United States, review involves examining the two main commitments of the proposed
Agreement. First, under the Agreement, a framework for jointly developing a 550-mile distance
(1.5 million acres) is established. Diplomats on both sides of the border claim that this framework
achieves a mutual goal of greater options for energy production to help gain energy independence
for both countries. The second commitment is to dismantle a treaty-based moratorium on oil and
gas development agreed to in 2000 and covering a 135-mile area (158,584 acres). Current treaty
provisions establishing the ban would also allow it to expire in 2014.
The proposed Agreement faces hurdles in both countries. In the United States, a possible hurdle is
the status of the U.S. safety reforms announced after the Deepwater Horizon spill in 2010. These
reforms are being phased in and full implementation is not anticipated until 2013 and 2014. These
regulations are considered a more robust set of deepwater drilling standards than were in place
prior to the Deepwater Horizon spill. Until they take full effect, the treaty-based moratorium is
perceived by many as a necessary mechanism to protect against the risk of oil spills. In Mexico,
although the Agreement has been accepted, implementation poses regulatory challenges.
Legislation in the 113th Congress concerning this Agreement includes H.R. 1613 and S. 812. On
June 27, 2012, the House passed H.R. 1613, the Outer Continental Shelf Transboundary
Hydrocarbon Agreements Authorization Act (H.Rept. 113-101). This bill would approve and
implement the Agreement. With no deadline for U.S. review of the proposed Agreement and no
schedule for review in the Senate, it is difficult to predict what legislative interest the Agreement
might attract, if any, during the remainder of the 113th Congress.

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Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement

Contents
Introduction ...................................................................................................................................... 1
Policy Review: U.S. Offshore Oil and Gas Leasing System ..................................................... 3
Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement ............................................ 4
Related Developments ............................................................................................................... 5
Geographic Areas Cited in the Proposed Agreement ....................................................................... 7
Concise Summary of the Proposed Agreement ............................................................................. 13
Possible Implications of the Proposed Agreement ......................................................................... 15
U.S. Perspectives and Issues for Congress .................................................................................... 17
Pending Legislation ................................................................................................................. 17
Worker Safety, Public Health, and Environmental Protection ................................................. 19
Disbursement of Revenue Anticipated From U.S.-Mexico Projects ....................................... 20
Concentration of U.S. Leases in the Gulf of Mexico .............................................................. 21
Conclusion ..................................................................................................................................... 21

Figures
Figure 1. U.S. Gulf of Mexico in Relation to Selected Coastal States and Cities ........................... 4
Figure 2. Basic Features of the Western and Eastern Gaps in the Gulf of Mexico .......................... 8
Figure 3. Detail of Western Gap in the Gulf of Mexico ................................................................... 9
Figure 4. Delimitation Line Defined by the Proposed Agreement ................................................ 10
Figure 5. Illustration of the Moratorium Area Located in the Western Gap .................................. 11
Figure 6. Selected Features of the Transboundary Area ................................................................ 12
Figure 7. Perdido Host as Example of Unitization in the Western Gulf of Mexico ....................... 16

Appendixes
Appendix. Summary of Hearings in the House ............................................................................. 23

Contacts
Author Contact Information........................................................................................................... 25

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Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement

Introduction
Since the 1970s, prompted by high fuel prices and a mutual interest in greater energy security, the
United States and Mexico have agreed to a series of bilateral treaties defining territorial claims
and laying the groundwork for future oil and gas development partnerships. These treaties and
other diplomatic activities are helping to define each nation’s stake in oil and gas resources in
ocean areas in the western Gulf of Mexico beyond each country’s 200-mile exclusive economic
zone (EEZ).1
A prominent component of these treaties has been an offshore moratorium on oil and gas
development covering a 158,584-acre area within a larger transboundary area encompassing 1.5
million acres.2 The stated purpose of this moratorium is to allow time for both countries to form a
partnership for jointly developing transboundary oil and gas resources beyond each country’s
EEZ.
The United States and Mexico are moving to form a partnership to jointly manage areas for
offshore drilling operations. This entails lifting the temporary moratorium and replacing it with a
framework for a joint development scenario.3 The United States and Mexico are not alone in
seeking this type of energy partnership. Around the world, nations claiming ocean areas beyond
established national borders are forming similar partnerships to cope with challenges associated
with managing offshore areas for developing oil and gas resources.4 The global race for ocean
energy resources is among other contributors to the intensification of diplomatic talks between
the United States and Mexico that started in 2010. These talks were concluded in 2012 by both
countries signing the U.S.-Mexico Transboundary Hydrocarbons Agreement (the Agreement).5
Several hurdles stand in the way of this energy partnership –– each stemming from different
policy dilemmas on each side of the border.6 While the Mexican Senate moved swiftly to approve
the Agreement on April 12, 2012, and the Mexican Presidency completed other domestic
requirements on May 22, 2012, uncertainties surround implementation of the proposed

1 See Treaty to Resolve the International Boundary, signed on November 23, 1970; Treaty on Maritime Boundaries
between the United Mexican States and the United States of America, signed on May 4, 1978; and Treaty between the
Government of the United Mexican States and the Government of the United States of America on the Continental
Shelf, signed on June 9, 2000.
2 For legal jurisdictions related to ocean energy development, see CRS Report RL33404, Offshore Oil and Gas
Development: Legal Framework, by Adam Vann.
3 Under the proposed U.S.-Mexico Transboundary Hydrocarbons Agreement, both countries might proceed with
deepwater development via “unitization,” a model commonly used for federally regulated drilling in the U.S. Gulf of
Mexico. A framework (specifically to support unitization as a model for development, which is explained in a basic
fashion in the next section) is widely recognized as necessary for offshore exploration and production to occur.
4 For details about developments involving China, see CRS Report R42784, Maritime Territorial and Exclusive
Economic Zone (EEZ) Disputes Involving China: Issues for Congress, by Ronald O'Rourke. For details about
developments involving multinational interests in the Arctic, see CRS Report R41153, Changes in the Arctic:
Background and Issues for Congress, coordinated by Ronald O'Rourke.
5 Department of State, Summary of the U.S.-Mexico Transboundary Hydrocarbons Agreement (July 30, 2012). This
summary can be found at http://www.state.gov/r/pa/prs/ps/2012/02/184235.htm.
6 For a discussion of conditions in Mexico, see CRS Report R42917, Mexico’s Peña Nieto Administration: Priorities
and Key Issues in U.S.-Mexican Relations, by Clare Ribando Seelke.
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Agreement. At issue is the role of Mexico’s state oil company, PEMEX, specifically whether
PEMEX is able to pursue deepwater operations without significant regulatory challenges.7
In contrast to the examination of issues underway in Mexico, the hurdle in the United States
involves lack of consensus about lifting the moratorium. To date, the Bureau of Safety and
Environmental Enforcement (BSEE) has not completed phasing in the safety reforms
promulgated by the agency in 2010 and 2011.8 Without these new safety requirements being in
place (anticipated for late 2013), there is little to counter the concerns expressed by U.S. interests
dependent on water-related activities in the Gulf of Mexico (fishing, recreation, and tourism) that
the moratorium is needed to prevent possible oil spill risks that can accompany deepwater drilling
operations in the Gulf of Mexico.9
On February 20, 2012, at the signing ceremony for the Agreement, U.S. officials acknowledged
that for the Agreement to take effect, both countries must review and accept it. Referring to the
challenges facing the Agreement on both sides of the border, these officials praised the
Agreement as a way to help both countries reach a mutual goal–– improved North American
energy security. Specifically, then-Secretary of State Hillary Rodham Clinton referred to “shared
challenges” when announcing the Agreement: “Our actions today are further proof of how
Mexico and the United States come together to solve shared challenges. From our earliest days,
the Gulf of Mexico has been a source of unity for our peoples and our countries. And the steps we
are taking today will help make sure it remains that way for decades to come.”10
To date, U.S. review of the proposed Agreement includes House consideration through hearings
and a markup session in the Committee on Natural Resources on June 6, 2013. On June 27, 2012,
the House passed H.R. 1613 (H.Rept. 113-101), a bill to approve and implement the Agreement.
This House action highlighted a persistent tension between proponents of ocean oil and gas
drilling seeking to accelerate production of domestic energy supplies and those opposed to ocean
drilling in favor of maintaining the moratorium in order to provide time for safety and
environmental issues to be addressed.
Congress can act on the proposed Agreement throughout the remainder of the 113th Congress, or
can defer action indefinitely. While the Agreement awaits U.S. attention, the moratorium that was
established in a previous treaty remains in effect until 2014, or until another acceptable
alternative (diplomatic or legislative) supersedes it.

7 “Mexico’s Congress Could Get Mexico Energy Reform Package Soon, Official Says,” Latin American Herald
Tribune, August 14, 2013. Both the Chamber of Deputies and the Senate have been in recess since May 1, 2013, and
the legislative session opens on September 1, 2013. Full article available at http://www.laht.com/article.asp?ArticleId=
812412&CategoryId=14091.
8 Bureau of Safety and Environmental Enforcement (BSEE, pronounced “Bessy”), is responsible for oversight and
enforcement, field operations, inspections, workforce safety, and decommissioning. For analysis of these topics as they
relate to recent reforms, see CRS Report R42942, Deepwater Horizon Oil Spill: Recent Activities and Ongoing
Developments, by Jonathan L. Ramseur and Curry L. Hagerty.
9 For findings of the cumulative effects of multiple management changes within the DOI bureaus responsible for
offshore energy production, see GAO-13-283 High-Risk Series (February 14, 2013). This report outlines management
challenges related to drilling programs. It is updated every two years, at the start of each new Congress. See also
Department of the Interior: Major Management Challenges,” GAO-11-42T (March 1, 2011).
10 U.S. Department of State, “Remarks by Secretary of State Hillary Rodham Clinton at the Signing of the U.S.-Mexico
Transboundary Agreement,” press release, February 20, 2012.
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Policy Review: U.S. Offshore Oil and Gas Leasing System
In its current form, the federally regulated offshore oil and gas leasing system comprises roughly
1.7 billion acres beyond state waters, including the U.S. exclusive economic zone (EEZ) and
areas beyond the U.S. EEZ.11 Responsibility for managing ocean energy resources falls within the
U.S. Department of State and the U.S. Department of the Interior’s (DOI’s) Bureau of Ocean
Energy Management (BOEM).12 Conveying U.S. leases through lease sales and managing the
leasing system (from early planning to decommissioning) is achieved mainly through the Five-
Year Outer Continental Shelf Oil and Gas Leasing Program13 and the Offshore Renewable Energy
Program.14 Consistent with the objectives of each program, BOEM manages more than 8,000
active leases organized in a grid system that was established at the start of the program in 1953.15
U.S. ocean energy production currently accounts for 26% of domestic oil production and about
16% of domestic natural gas production. While most offshore acreage is found in the Alaska
region (approximately 1.03 billion acres of a total of 1.7 billion acres), oil and gas leases are
located mainly in the Gulf of Mexico (89% of the federally regulated offshore energy activity is
concentrated in an area accounting for about 2% of U.S. waters). Figure 1 illustrates generally
where U.S. oil and gas lease sales take place in the Gulf of Mexico.
Specifically, Figure 1 depicts ocean areas in the Gulf of Mexico in relation to coastal states and
cities, highlighting areas eligible for lease sales (shaded areas) and areas ineligible for lease sales
(unshaded areas).16 In addition to generating domestic energy supplies in these areas, federally
regulated offshore energy projects are recognized as generating significant public receipts,
including approximately $6.9 billion in 2012.17 U.S. lease sales in the Gulf of Mexico resulted in
reported revenues totaling over $13 billion in the last two years.18 DOI estimates future revenues
of $50 million in 2014 from energy activities projected to take place in the transboundary area.19

11 The U.S. EEZ generally includes territory 200 nautical miles seaward of state waters. See Presidential Proclamation
No. 5030, 48 Federal Register 10605 (March 14, 1983).
12 Bureau of Ocean Energy Management (BOEM, rhymes with “Rome”) is tasked with offshore leasing administration,
including developing maps, completing scientific and economic analyses, and issuing leases. BOEM also participates
in some international relations missions regarding U.S. ocean energy resources.
13 See Five-Year OCS Oil and Gas Leasing Program 2012-2017. This program was approved on August 27, 2012, and
is anticipated to be in place through 2017. Each program is mandated by the Outer Continental Shelf Lands Act (43
U.S.C. §1344) to be “a schedule of proposed lease sales indicating, as precisely as possible, the size, timing, and
location of leasing activity which ... will best meet national energy needs.”
14 43 U.S.C. §1337(p). For more information about deployment of renewable energy projects, see
http://www.boem.gov/Renewable-Energy-Program/Smart-from-the-Start/Index.aspx.
15 After 1953 the federal land tenure system reflected a federal grid system beginning seaward of state submerged land
tenure systems. Starting in1983 this grid system recognized the U.S. EEZ.
16 For the purposes of this report, the state and federal waters of the Gulf of Mexico are defined as follows: Florida
waters extend 9 nautical miles (10.4 statute miles) from shore; Louisiana, Mississippi, and Alabama state waters extend
3 nautical miles (or 3.5 statute miles) from shore; and Texas state waters extend 9 nautical miles (10.4 statute miles)
from shore. For an comprehensive analysis of coastal and marine uses in the western Gulf of Mexico, see 2012-2017
Western Planning Area/Central Planning Area Multisale Environmental Impact Statement (EIS), BOEM (available at
http://www.boem.gov/uploadedFiles/BOEM/Environmental_Stewardship/Environmental_Assessment/NEPA/BOEM-
2012-019_v3.pdf.
17 Statistics about annual energy supplies and annual receipts from bonus bids, rentals, and royalties are published
through numerous sources. The statistics in this report are derived from the Office of Natural Resources Revenue
within DOI, available at http://www.ONRR.gov.
18 For ocean energy revenue statistics see ONRR.gov. FY2012 federal offshore reported revenues were $6.9 billion;
FY2011, $6.5 billion; and FY2010, $5.3 billion.
19 See DOI FY2014 Congressional Budget Justification, Bureau of Ocean Energy Management (BOEM), p. 12. DOI
(continued...)
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Figure 1. U.S. Gulf of Mexico in Relation to Selected Coastal States and Cities

Source: BOEM.
National ownership and use of ocean resources are issues attracting increased attention in
Congress, particularly when resource management issues involve transboundary areas of
international waters.20 Competing national interests in offshore drilling stir questions: How does
Congress balance the nation’s interests in resource use and protection in international ocean
areas? What are effective ways to monitor safety at international marine borders, particularly
when the marine areas fall under the jurisdiction of multiple federal agencies?21 Some in
Congress have expressed an interest in these questions through legislative proposals, program
oversight, and annual appropriations for the relevant federal agencies.
Proposed U.S.-Mexico Transboundary Hydrocarbons Agreement
The Agreement at issue is widely recognized as an initial step toward a joint development
scenario involving three U.S.-Mexico commitments: (1) eliminating the moratorium in waters
beyond their respective exclusive economic zones (EEZs); (2) studying the transboundary areas

(...continued)
bases this statement on assumptions about bonus payments and other predicted revenue streams for rentals and taxes
deriving from operations in the transboundary area cited in the Agreement. Estimates of federal budget effects vary
widely. For example, a recent estimate by the Congressional Budget Office (CBO) provided as part of analysis of a
specific bill to implement the Agreement (H.R. 1613) concluded that approving and implementing the Agreement in
that instance would increase federal receipts by $25 million from 2014 through 2023.
20 International customary law provides frameworks for governance of some but not all areas and activities beyond
national jurisdictions such as a nation’s EEZ. One widely recognized framework is the United Nations Convention of
the Law of the Sea (UNCLOS), a multilateral treaty with which the United States participates as a non-party. While not
directly applicable to U.S-Mexico bi-lateral compacts in the Gulf of Mexico, Article 76 of UNCLOS has provided a
process for claiming extended continental shelf (ECS) areas resulting in territorial claims reaching 350 nautical miles
from a country’s coastal areas.
21 Each of these issues is discussed in the section of this report entitled “Pending Legislation.”
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(exchanging geological information); and (3) potentially deploying joint oil and gas operations
associated with developing transboundary reservoirs.22
Under the current statutory framework, U.S. commitments fall into three basic categories:
commitments relative to federal-state coordination23 (mainly to recognize state policies in state
waters); commitments that are federal in nature24 (mainly balancing competing energy and
environmental interests at the national level); and commitments relative to the international
context25 (a fluid mix of military, trade, and diplomatic missions derived unilaterally or through
nation-to-nation mechanisms). Given the fragmented and overlapping nature of these three
categories, several questions have arisen related to how U.S. commitments under the Agreement
might affect U.S. interests. Would the Agreement lead to any new legal or regulatory obligations
for U.S. interests? Would existing environmental laws or existing lease terms and conditions in
effect in the Gulf of Mexico be affected by the Agreement? What, if any, fiscal implications might
result from carrying out collaborative projects in the boundary area?
These questions will likely be examined in the context of several recent developments
summarized in the next section.
Related Developments
Federal activities relevant to U.S. legislative review of this Agreement are unfolding in the
legislative, regulatory, and diplomatic contexts listed below.
• Hearings Addressing a Range of Public Lands Issues. Multiple oversight
hearings in the House and Senate during the 113th Congress have involved
lawmakers examining how current federal resource management laws govern
energy production. These hearings reflect two visions: seeing the need to grant
access to some areas to enhance energy production and ––as a counterbalance––
seeing the need to defer access to some areas to protect people and the
environment from risk. As part of hearings about offshore energy development,
some Members are proposing statutory changes related to the following:
(1) alternatives to current programs for allocating federal receipts generated from

22 Joint commitments listed in the agreement involve goals for the safe and equitable exploitation of transboundary
reservoirs. These commitments are intended to unfold over many years through further negotiations aimed at
facilitating more specific approaches to such issues as standards for operations and environmental review. Until the
agreement is accepted, the timeline for implementation remains unclear. Numerous federal regulators might be
involved in regulating activities covered by the agreement. Operational safety and revenue obligations related to any
future oil and gas leases have already been delegated to the Bureau of Ocean Energy Management (BOEM, within the
Department of the Interior). See CRS Report R42599, Department of the Interior (DOI) Reorganization of Ocean
Energy Programs, by Curry L. Hagerty.
23 The Submerged Lands Act (SLA), 43 U.S.C. §§1301 et seq. Consistent with SLA, most federal obligations are
defined relative to the jurisdictional bounds of state and federal waters.
24 The Outer Continental Shelf Lands Act of 1953 (OCSLA), 43 U.S.C. §§1331 et seq. Consistent with OCSLA, federal
mandatory and discretionary responsibilities are defined for energy resource management and revenue management in
areas beyond state waters referred to as the Outer Continental Shelf (OCS).
25 U.S. commitments relative to managing ocean energy resources in international waters involve various treaties.
Separate from the U.S.-Mexico bilateral treaties discussed above, the United States is party to four prominent ocean
governance treaties adopted in 1958: Convention on the Territorial Sea and the Contiguous Zone, Convention on the
High Seas, Convention on the Continental Shelf, and Convention on Fishing and Conservation of the Living Resources
of the High Seas.
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drilling operations and offshore wind farms; (2) deployment of more diverse
ocean energy technologies in a wider range of locations; and (3) changes in the
pace of inspections and permitting. To date, legislative attention to these various
themes demonstrates that lawmakers are considering statutory changes by
addressing the U.S. offshore energy program as a whole. In contrast to piecemeal
approaches of the past, there seems to be an interest in examining a broad agenda
of interlocking issues to achieve a more diverse U.S. portfolio in the Gulf of
Mexico and beyond.

What, If Anything, Has Changed Since the Gulf Oil Spill of 2010?
In the aftermath of the April 20, 2010, explosion and fire on the Deepwater Horizon26 in the Gulf of Mexico, federal
regulators reexamined some of the risks and benefits accompanying deepwater drilling, bolstered enforcement
measures related to operational safety, and revised standards for certain deepwater drilling operations.
Perceptions about the adequacy of these federal reforms vary. As implementation of these reforms continues to
unfold, some in Congress have expressed an interest in how the reforms might be affecting energy production,
worker safety, and environmental protection in U.S. waters.27
More than one Government Accountability Office (GAO) study is underway to offer insights on DOI agency
performance as part of a broader look at how federal offshore areas are managed.28

• Regulatory Actions to Solicit Bids for Ocean Tracts in the Transboundary
Area. As part of periodically conducting U.S. lease sales to convey development
rights in ocean tracts in the Gulf of Mexico, BOEM has offered leases for oil and
gas development rights pursuant to treaty terms established in 2000. As in the
past, BOEM has announced that any bids on the transboundary area would not be
opened until after both parties have accepted the Agreement. Specifically, as part
of offering offshore oil and gas development rights beyond the U.S. EEZ and
near the marine boundary area with Mexico, in 2012 BOEM conducted
Sale 229,29 and in 2013, Sale 233.30 Agency preparation for these lease sales has

26 The Deepwater Horizon events resulted in 11 worker fatalities, a massive oil release, and a national response effort
in the Gulf of Mexico led by the federal government. Based on estimates from the U.S. Geological Survey, the oil spill
was the largest in U.S. waters.
27 76 Federal Register 64432 (October 18, 2011). BSEE revised 30 CFR Chapter II. For a status report, see CRS Report
R42942, Deepwater Horizon Oil Spill: Recent Activities and Ongoing Developments, by Jonathan L. Ramseur and
Curry L. Hagerty.
28 Gene L. Dodaro, U.S. Comptroller General, testimony before the House Committee on Oversight and Government
Reform, February 17, 2011; Committee on Appropriations, Subcommittee on Interior, Hearing March 17, 2011. GAO-
13-283 High-Risk Series (February 14, 2013). This GAO report is updated at the start of each new Congress.
29 Specifically, on November 28, 2012, BOEM offered offshore oil and gas development rights beyond the U.S. EEZ
and near the marine boundary area with Mexico as part of the public lease sale referred to as Sale 229. Prior to U.S.
leasing activities near the U.S.-Mexico continental shelf boundary, the Bureau of Ocean Energy Management (BOEM)
issued the following statement: “Within 30 days following the approval of the Agreement between the United States of
America and the United Mexican States Concerning Transboundary Hydrocarbon Reservoirs in the Gulf of Mexico or
by May 31, 2013, whichever occurs first, the Secretary of the Interior will determine whether it is in the best interest of
the United States either to open bids for boundary area blocks or to return the bids unopened.” The sale drew 131 bids
on 116 ocean tracts from 13 companies. Ocean tracts offered at the sale were located from just beyond Texas state
waters to acreage beyond the U.S. EEZ. A previous Western Gulf lease sale (Sale 218 conducted in December, 2011)
offered acreage in this general area, attracting 241 bids on 191 ocean tracts from 20 companies. For details about the
most recent sale, see http://www.boem.gov/Oil-and-Gas-Energy-Program/Leasing/Regional-Leasing/Gulf-of-Mexico-
Region/Lease-Sales/229/index.aspx.
30 This sale entailed 3,864 tracts from nine to more than 250 miles off the U.S. coast, in water depths ranging from 16
(continued...)
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included offering maps of offshore areas depicting where the U.S. grid is located
with respect to leased and unleased tracts and stipulating certain lease terms and
conditions related to tracts in the transboundary area.
• Diplomatic Cooperation on Oil Spill Risks: For decades, U.S.-Mexico
cooperation on oil spill risks has included planning strategies to cope with
pollution caused by oil spills. Both countries participate regularly in a joint
contingency planning in order to ensure adequate response to spills.31 The current
joint plan—known as Mexus Plan—sets standard operating procedures in case of
incidents that threaten the coastal waters or marine environment of the border
zone of both countries. The U.S. response team is coordinated by the Coast
Guard’s Assistant Commandant for Marine Safety and Environmental
Protection.32
Geographic Areas Cited in the Proposed Agreement
The Agreement reflects a continued commitment by the United States and Mexico to identify and
define certain geographic areas located beyond each country’s EEZ. These areas were first
recognized by both countries through diplomatic channels in 1978. Figure 2 illustrates these
areas in relation to U.S.-Mexico treaty lines.33
The rationale for the United States and Mexico recognizing certain geographic areas located
beyond each country’s EEZ is consistent with customary international law relevant to countries
planning to regulate drilling operations beyond their EEZs. It is widely recognized that areas
beyond the U.S. - Mexico EEZs are largely unexamined for oil and gas development. As a result,
there is not a robust collection of data about impacts of energy development on particular
populations and ecosystems. Both countries’ diplomats have stated plans to monitor activities
taking place in transboundary areas as a component of a joint development scenario.
The line-striped areas depicted in Figure 2 illustrate areas defined by treaty. These areas are
sometimes referred to as “gaps” (specifically the “Western Gap” and the “Eastern Gap”). This

(...continued)
to more than 10,975 feet. BOEM estimates this lease sale could result in the production of 116 million to 200 million
barrels of oil and 538 billion to 938 billion cubic feet of natural gas. Following this sale, bids go through an evaluation
process within BOEM to ensure the public receives fair market value before a lease is awarded. Sale statistics for Sale
233 are found at http://www.boem.gov/Sale-233.
31 U.S. Department of State, “Mexico, Pollution: Marine Environment, Agreement signed July 24, 1980,” TIAS, 10021.
32 U.S. Coast Guard, “Mexus Plan, The Joint Contingency Plan Between the United Mexican States and the United
States of America Regarding Pollution of the Marine Environment by Discharges of Hydrocarbons and Other
Hazardous Substance,” February 25, 2000. Furthermore, National Commission on the BP Deepwater Horizon Oil Spill
and Offshore Drilling report issued in January 2011 reports Mexico already conducts safety drills in the Gulf of Mexico
and it is in the U.S. national interest to engage in a common, rigorous system of regulatory oversight to cooperate on
containment and response strategies in case of a spill. See Deepwater, The Gulf Oil Disaster and the Future of Offshore
Drilling, Report to the President, p. 254 and p. 300. See the full text of the report at
http://www.oilspillcommission.gov/sites/default/files/documents/DEEPWATER_ReporttothePresident_FINAL.pdf.
33 In these areas, referred to as “gaps,” national marine boundaries have not been fully defined. The Western Gap is the
polygon located near the Mexican coast of Tamaulipas and the U.S. coast of Houston, TX. The Eastern Gap is the
polygon located near the Mexican coast of Yucatan, the U.S. coast of New Orleans, LA, and the coast of Cuba. A
discussion of the Eastern Gap is beyond the scope of this report. The Western Gap is depicted in Figure 6.
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signifies not only a gap that exists in how nations define the legal status of that area, but also a
gap in available scientific information about the area.
Figure 2. Basic Features of the Western and Eastern Gaps in the Gulf of Mexico

Source: Adapted by CRS from International Boundaries Research Unit (IBRU) 1997. Line-striped areas are the
western and eastern polygons representing “gaps” where national marine boundaries have not been ful y defined.
Western Gap
The Western Gap is the polygon located in Figure 2 in the western portion of the Gulf of Mexico
and in Figure 3 as the main image. The Western Gap encompasses about 4.2 million acres. The
U.S. acreage in the Western Gap includes about 1.5 million acres to the north of the
transboundary area featured in various degrees of detail in Figures 2, 3, 4, 5 and 6.34 Of the U.S.
acreage within the Western Gap, the portion falling in the transboundary area and covered by the
moratorium measures 158,584 acres. Some ocean acreage located beyond the U.S. EEZ (other
than the transboundary area within Western Gap covered by moratorium) has been offered at U.S.
lease sales since 2001.35

34 According to BOEM, the division of the Western Gap allocates 1,507,840 acres or 38% to the United States and
2,624,000 acres or 62% to Mexico.
35 See H.Rept. 113-101, Part 1, p. 4. “Currently, there are 67 active lease blocks held by nine companies on the U.S.
(continued...)
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Figure 3. Detail of Western Gap in the Gulf of Mexico

Source: CRS modifications to image available from National Geodetic Survey (NGS) National Ocean Service
(NOS) National Oceanic and Atmospheric Administration (NOAA) at http://www.ngs.noaa.gov/CORS/Articles/
solgps.pdf.
Transboundary Area
The transboundary area defined in the Agreement is illustrated in Figure 4 as a solid yellow line
running east beyond Texas state waters, through the Western Gap, to the western edge of the
Eastern Gap. As discussed above, the U.S. portion of this area encompasses 1.5 million acres,
located in a corridor also referred to as the Delimitation Line. See Figures 2, 4, 5 and 6 for four
different views.

(...continued)
portion of the Western Gap, meaning roughly 20% of the available acreage in the Western Gap area is under lease.” For
a discussion of U.S. leasing activities in the western Gulf of Mexico beyond the U.S. EEZ and potentially subject to the
provisions of international agreements, see U.S. Accession to U.N. Convention on the Law of the Sea Unnecessary to
Develop Oil and Gas Resources, Backgrounder No. 2668 by Steven Groves, p. 9 (May 14, 2012).
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Figure 4. Delimitation Line Defined by the Proposed Agreement

Source: BOEM. U.S. side of the Western Gap (1.5 million U.S. acres) and the Eastern Gap (undetermined U.S.
acreage) is shown. Mexican coastal areas are not shown.
Moratorium Area
The moratorium area is located entirely inside the Western Gap. It comprises a narrow (2.8
nautical miles) corridor cutting across a 135-mile distance (158,584 acres).36 The moratorium area
attracts attention, partly because, as Figures 2, 3, 4 and 5 illustrate, it is located in a mid-section
of the 550-mile transboundary area.
Consistent with U.S.-Mexico treaty provisions, this moratorium expires in 2014. In the absence of
applicable measures to the contrary, and absent clearance to lift the ban pursuant to the
Agreement, the following actions are possible: allowing the moratorium to expire without further
indication of national relations relative to managing the area, extending the moratorium for an
agreeable time frame; or replacing the moratorium with some other alternative to which the
United States and Mexico may need to agree.

36 Analysis of the Eastern Gap area is beyond the scope of this report. For more information about the Eastern Gap and
how the U.S.-Mexican boundaries for this area were drawn, see GPS World (May, 2001) available at
http://www.ngs.noaa.gov/CORS/Articles/solgps.pdf.
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Figure 5. Illustration of the Moratorium Area Located in the Western Gap

Source: CRS, adapted from the treaty documents submitted by U.S. negotiators in support of Treaty between the
Government of the United Mexican States and the Government of the United States of America on the Continental Shelf
signed on June 9, 2000.
Upon signing the Agreement, U.S. negotiators elaborated on various diplomatic activities,
including plans to eliminate the moratorium after review and acceptance of the Agreement by
both countries.37 Further commitments included providing U.S. leaseholders with a framework
for exploiting transboundary reservoirs through “unitization”;38 encouraging options for
investment; offering predictable resolution of disputes; and ensuring a joint safety regime.39
These commitments spark a tension between the perceived need to commence oil and gas
operations and the notion that deferring such operations through the moratorium would provide
more time to resolve domestic regulatory policy dilemmas. This tension is discussed in the
section “Issues for Congress.”

37 U.S. Department of State, Summary of the U.S.–Mexico Transboundary Hydrocarbons Agreement, July 30, 2012,
http://www.state.gov/r/pa/prs/ps/2012/02/184235.htm. For the purpose of this report, all treaties are referred to by the
year the treaty is signed. Accordingly, this treaty is the “1970 Treaty.” In November 1970, the two nations established
their maritime boundaries in the Gulf of Mexico; the treaty entered into force on April 18, 1972.
38 Transboundary reservoirs straddle marine areas between government (nations or U.S. coastal states). Unitization is
one approach to determining the recovery of oil from these areas. This concept is discussed throughout this report.
39 For the full set of remarks at the signing of the U.S.-Mexico Transboundary Agreement, Los Cabos, Mexico,
February 20, 2012, see http://www.state.gov/secretary/rm/2012/02/184236.htm.
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Figure 6. Selected Features of the Transboundary Area

Source: CRS.
Notes: CRS designed this image to feature lines detailed in the Agreement. Specifically, CRS used point data
from the Treaty between the Government of the United States of America and the Government of the United
Mexican States on the Delimitation of the Continental Shelf in the Western Gulf of Mexico beyond 200 Nautical
Miles, June 9, 2000. This image also features locations of the Sigsbee Escarpment and the Mississippi Canyon, not
detailed in the Treaty or depicted in other images in this report.
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Concise Summary of the Proposed Agreement40
This section introduces readers to the contents of the Agreement by summarizing some major
concepts found in all seven chapters and 27 articles. Provisions attracting particular attention
include Chapter 3 (Articles 10-13: establishing a joint development scenario) and Chapter 7
(Article 24: terminating the current moratorium).
Chapter 1 (Articles 1-5) describes the “General Principles” of the Agreement including the
scope,41 definitions,42 jurisdiction43 and activities near the Delimitation Line.44 Furthermore, this
chapter establishes a process for jointly determining the existence of transboundary reservoirs.45
Chapter 2 (Articles 6-9) outlines joint guidelines for companies from both countries to jointly
explore and develop transboundary resources cited in the Agreement. These guidelines entail a
“Unitization Agreement;”46 joint management principles;47 and production allocations.48
Chapter 3 (Articles 10-13) establishes requirements related to agreements involving unit
operators.49 It states broad guidelines addressing commercial aspects of the following: operations
subject to a unit operation agreement50 and fiscal terms related to exploiting oil and natural gas
reservoirs in specific areas.51

40 This section does not provide a comprehensive legal examination of the Agreement’s contents and does not offer an
in-depth analysis of U.S. interests in various provisions. A variety of topics addressed in other CRS reports analyze
policy perspectives surrounding U.S. interests in the Agreement: peacetime military engagement; fisheries
enforcement, search and rescue, drug interdiction, trade, investment and marine pollution law enforcement. These
topics are distinct in many ways from topics surrounding U.S. interests in managing ocean energy resources in U.S.
waters. For more information on these aspects of U.S.-Mexico relations, see CRS Report R42917, Mexico’s Peña Nieto
Administration: Priorities and Key Issues in U.S.-Mexican Relations, by Clare Ribando Seelke; CRS Report R41349,
U.S.-Mexican Security Cooperation: The Mérida Initiative and Beyond, by Clare Ribando Seelke and Kristin Finklea;
and CRS Report R42965, NAFTA at 20: Overview and Trade Effects, by M. Angeles Villarreal and Ian F. Fergusson.
41 Article 1 provides that the Agreement applies to areas extending “across the Delimitation Line” This line begins
beyond 9 nautical miles from the coastline of Texas and ends 550 miles to the east, at the point to the west of the
Eastern Gap.
42 Article 2 provides definitions for 24 terms, starting with “Confidential Data” and ending with “Unit Operating
Agreement.”
43 Article 3 states that nothing in the Agreement “shall be interpreted as affecting the sovereign rights and the
jurisdiction which each Party has under international law ...”
44 Article 4 establishes requirements for consultations “on exploration and exploitation activities” carried out within
certain areas surrounding the Delimitation Line.
45 Article 5 outlines a multi-step process for reaching a determination on the existence of a Transboundary Reservoir.
This determination entails deadlines for consultations and submissions to the “Joint Commission” as defined elsewhere
in the Agreement.
46 Article 6 details the components of a Unitization Agreement, including requirements to measure production;
procedures for ensuring accurate payments of royalties and other proceeds; and safety and environmental measures to
be taken under the national laws of each Party.
47 Article 7 addresses management guidelines prior to the formation of a transboundary unit.
48 Articles 8 and 9 provide for determining and redetermining allocation of production.
49 Article 10 reads as follows: “The Executive Agencies shall ensure that a unit operator for a Transboundary Unit is
designated by agreement between the Licensees. The designation or change of the unit operator shall be subject to the
approval of the Executive Agencies. The unit operator will act on behalf of the Licensees.”
50 Articles 11 and 12 provide general guidelines addressing operational aspects of a project to facilitate cooperation
between relevant parties.
51 Article 13 provides the following: “Income arising from the Exploitation of Transboundary Reservoirs shall be taxed
(continued...)
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Chapter 4 (Article 14) creates an institutional body for resolving disputes. This body is referred
to as a Joint Commission.52
Chapter 5 (Articles 15-17) details the process for dispute settlement by providing options for
parties to resolve disagreements arising from implementation of this Agreement.53
Chapter 6 (Articles 18-19) outlines principles for joint inspections relating to safety and
environmental protection.54
Chapter 7 (Articles 20-27) concludes the Agreement with a variety of provisions to guide the
process for amending, terminating and bringing the Agreement into force,55 terminating the
moratorium56 and determining how the Agreement might relate to other agreements.57
Consistent with both countries stated intentions in 2010,58 officials on both sides of the border
have asserted that the Agreement achieves stated goals for “jointly managing, administering and
governing” the transboundary area in a “considered, sustainable and structured manner” in order
to “optimize energy resource development and to protect the surrounding marine environment.”59

(...continued)
in accordance with the legislation of the United Mexican States and the United States of America respectively, as well
as the Convention between the Government of the United States of America and the Government of the United
Mexican States for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with respect to Taxes on
Income and Capital, signed on September 18th, 1992, as amended (and as may be amended in the future), or any
Convention superseding that Convention as the Parties may enter into in the future.”
52 Article 14 is more detailed than most other provisions in the Agreement. It refers to powers vested in the Joint
Commission for resolving differences concerning the allocation of production pursuant to Articles 8 and 9. It sets
deadlines for the Joint Commission to act and provides alternatives for resolving disputes.
53 Articles 15, 16 and 17 provide broad guidelines for consultations, mediation, expert determination and arbitration.
These guidelines include multiple references to deadlines and to terms defined elsewhere in the Agreement.
54 Articles 18 and 19 generally reference “applicable national law” as a basis of joint inspections in the area.
55 Articles 20, 21, 22, and 23 provide details about amending, terminating and bringing this Agreement into force.
56 Article 24 reads as follows: “Upon entry into force of this Agreement, the period of any moratorium on the
authorization or permitting of petroleum or natural gas drilling or exploration of the continental shelf within the
boundary “Area” as established by Article 4, paragraph 1, of the 2000 Treaty on the Continental Shelf and extended by
any subsequent exchanges of notes shall be terminated.”
57 Article 25 asserts that “nothing in this Agreement shall affect the rights and obligations of the Parties with respect to
other international agreements to which they are both party.”
58 On June 23, 2010, a Joint Statement was adopted by President Obama and then-President Calderon at the conclusion
of then-President Calderon’s State Visit to Washington on May 19, 2010. For the full set of remarks are found at
http://www.whitehouse.gov/the-press-office/joint-statement-president-barack-obama-and-president-felipe-calder-n. See
also Joint Statement by President Barack Obama, President Felipe Calderon of Mexico, and Prime Minister Stephen
Harper of Canada on Climate Change and Clean Energy (August 10, 2009).
59 For the full set of remarks at the signing of the U.S.-Mexico Transboundary Agreement, Los Cabos, Mexico,
February 20, 2012, see http://www.state.gov/secretary/rm/2012/02/184236.htm.
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Possible Implications of the Proposed Agreement60
Diplomats from the United States and Mexico have described possible implications of the
Agreement entering into force as follows:
• The current moratorium on oil exploration and production would end.
• A cooperative process for managing the maritime boundary region would begin.
• It would be possible for commercial activities to unfold involving options for
companies to voluntarily enter into unitization arrangements. In the event such an
arrangement is not achieved, the Agreement also establishes options by which
companies might develop potential resources on each side of the border.
• Joint inspection teams addressing compliance with applicable laws and
regulations would be activated by both governments to review operational plans
relevant to transboundary reservoirs.61
Parties on both sides of the border have observed that the Agreement does not provide specific
details about a possible development scenario. Instead it offers a framework for both countries to
work further to commence joint operations.
Other possible impacts on activities in the Gulf of Mexico or, from a broader perspective, on the
national ocean energy portfolio remain a matter of conjecture.62 For example, as part of
estimating fiscal impacts, many in Congress turn to the Congressional Budget Office (CBO) score
for H.R. 1613.63 On May 17, 2013, CBO estimated that “enacting H.R. 1613 would increase
offsetting receipts from offshore lease sales by $25 million from 2014 through 2023.” As part of
this analysis, CBO assumes, first, that approving the Agreement would allow DOI to offer leases
for acreage which is currently under moratorium and, second, that approving the Agreement
would increase values of other leased tracts in the nearby area.64
Other possible implications of the Agreement coming into force involve coping with challenges
related to safety and monitoring marine borders; issues surrounding disbursement of potential
revenue anticipated from U.S.-Mexico projects; and the concentration of undeveloped leases in
the Gulf of Mexico. Each of these issues is discussed in the next section.

60 Information used for this section was obtained from the U.S. Department of State Fact Sheet dated February 20,
2012, and found at http://www.state.gov/r/pa/prs/ps/2012/02/184235.htm.
61 See joint statement adopted by Presidents Obama and Calderon, Washington, DC, May 19, 2010.
62 Concurrent with regulating operations in the Gulf of Mexico, DOI is assessing energy resource potential off the coast
of the Mid- and South Atlantic and off the coasts of California and Alaska, including in the Chukchi and Beaufort Seas.
For a comprehensive statement of current federal policies toward offshore oil and gas development see 77 Federal
Register 40080 (July 6, 2012).
63 For a full CBO report on H.R. 1613, see http://www.cbo.gov/sites/default/files/cbofiles/attachments/hr1613.pdf.
64 For information about the lease sales referred to in the CBO score see Five-Year Outer Continental Shelf (OCS) Oil
and Gas Leasing Program for 2012–2017, 77 Federal Register 40080 (July 6, 2012).
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What Is “Unitization?”
Unitization is a method to jointly develop a field or reservoir that might encompass a large area and even straddle a
state or national boundary. This method for OCS development is common in U.S. waters. Described by some as the
centerpiece of the Agreement, unitization facilitates companies licensed by the United States and by Mexico (through
the state oil company Petróleos Mexicanos, PEMEX) to operate as one entity as part of joint operations involving
distinct oil and gas reservoirs potentially discovered to extend across the maritime boundary.65 Frameworks for
unitization (including the framework adopted in the U.S.-Mexico Agreement) can be founded on a combination of the
following:
•
international law—formal agreements between countries (consistent with treaties, conventions and international
customs);
•
national laws of host governments, and contracts between host governments and licensees; and
•
private contracts among licensees and interested third parties, such as operating agreements and production
sales contracts.
An example of a project in U.S. waters made possible through unitization exists in the western Gulf of Mexico––the
Perdido project. Figure 7 illustrates this project by highlighting the three subsea units that tie back to a floating
production facility referred to as a Regional Host. This facility is located in approximately 8,000 feet of water,
approximately 250 miles south of Houston, TX, and less than 100 miles from the transboundary area cited in the
Agreement. When first constructed, this project was the deepest “vertical access” facility in the world.66
Figure 7. Perdido Host as Example of Unitization in the Western Gulf of Mexico

Source: Perdido Development System, modified by CRS.

65 Transboundary Agreement, Articles 2, 6, 7, 8, 9, 10, 11, 12, 18, 22, 23. See also S.Rept. 112-43, Oil Mexico, and the
Transboundary Agreement, Senate Committee on Foreign Relations (December 21, 2012). See also 30 CFR 250
Subpart M. See http://www.bsee.gov/Exploration-and-Production/Unitization/Unitization.aspx.
66 A “vertical access” facility is a system comprising a floating host located over a drilling location with the floating
host comprising drilling functions. More information on this facility can be found at http://www.shell.com.
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U.S. Perspectives and Issues for Congress
Three developments set the stage for the 113th Congress to review this Agreement. First, both
governments have demonstrated an increased interest in developing ocean energy resources.67
Second, the Mexican Senate moved swiftly to approve the Agreement on April 12, 2012, and the
Mexican Presidency completed all other domestic requirements to implement the Agreement on
May 22, 2012. Third, various U.S. stakeholders (some in the U.S. energy sector and some
environmental organizations) have expressed interest related to the Agreement.68
Many Members of Congress and the Obama Administration have supported efforts to enhance
U.S.-Mexico energy cooperation for several reasons, including enhancing energy security.
Executive branch officials assert that U.S. interests benefit from jointly developing the
transboundary area, particularly in light of Mexico’s role as a key U.S. partner in other policy
spheres (trade, border issues, international drug interdiction and law enforcement). They also
assert that U.S.-Mexico cooperation will help manage ocean energy resources on both sides of the
marine border by enhancing energy production while monitoring safety and environmental
protection.
U.S. diplomatic officials have asserted that various commitments between the United States and
Mexico protect U.S. interests and that this Agreement merely updates and strengthens existing
treaties between the two countries. At issue for some in Congress is whether this U.S.-Mexico
Agreement is in step with U.S.-Mexico partnerships relevant to marine borders, worker safety and
leasing policies involving receipts and disbursements and other issues of mutual interest.69
Further attention to the proposed Agreement, if any, during the 113th Congress is likely to attract
interest in legislation discussed below.
Pending Legislation
As noted above, the Administration and some in and outside of Congress have advocated for swift
U.S. review and acceptance of the Agreement. Others have expressed skepticism that the
Agreement is an optimal approach to expand the ocean energy portfolio in the Gulf of Mexico.
Two legislative initiatives (H.R. 161370 and S. 812)71 were introduced as part of the U.S. review

67 In the United States the 110th Congress allowed the annual congressional moratoriums included in DOI
appropriations acts to expire on September 30, 2008, and did not extend these congressional bans on oil and gas leasing
activities (P.L. 110-329). Legislation related to domestic moratoriums has been driven by support for the following
national objectives: promoting domestic energy production to improve energy security and increasing offshore receipts
and disbursements.
68 See statement of Nicolette Nye, spokeswoman for National Ocean Industries Association (NOIA) in U.S.-Mexico
transboundary Agreement mired in Congress (January 8, 2013) at http://www.eenews.net/gw/sample/print/3. See
statement of Greenpeace, Transboundary Agreement Spells Disaster for the Gulf, February 22, 2012.
69 The United States and Mexico launched the Bilateral Framework on Clean Energy and Climate Change in April 2009
to explore ways to further develop the potential of an energy relationship. With its focus on renewable energy, energy
efficiency, jobs and technology development, the Bilateral Framework has supported work on common standards,
closer integration of electricity grids and other development goals in border regions.
70 This bill was taken up at a full committee mark-up session on May 15, 2013, and, with one amendment, was
favorably reported. The summary provided describes the bill as passed by the House on June 27, 2013.
71 Introduced April 25, 2013, and referred to the Committee on Energy and Natural Resources.
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of this Agreement. Each bill would accept the Agreement taking a slightly different approach to
implementation.
H.R. 1613
H.R. 1613, “Outer Continental Shelf Transboundary Hydrocarbon Agreements Authorization Act”
was considered and passed by the House on June 27, 2013.72 This legislation would establish
guidelines and procedures for implementing that agreement; and among other measures, to
provide for legislative review of any future agreements governing that area. This bill would
amend the Outer Continental Shelf Lands Act (OCSLA, 43 U.S.C. 1331 et seq.) to implement a
transboundary hydrocarbon Agreement by providing new powers to the Secretary of the Interior
for approving unitization agreements.73
By adding a new section to the end of the OCSLA (“Section 32”), the bill authorizes the Secretary
to implement the Agreement with Mexico by completing the following steps:
• submitting the Agreement to the Speaker of the House; the Majority Leader of
the Senate; the Chairs of the House Committee on Natural Resources and the
Senate Committee on Energy and Natural Resources;
• including in the submission (1) legislation relevant to implementation; (2)
economic analysis of impacts of the Agreement on domestic production of
offshore oil and gas resources; (3) a description of regulations expected to be
issued to implement the Agreement; and (4) adopting unitization as the approach
to developing the area.74
Furthermore, H.R. 1613 would exempt U.S. firms from certain reporting requirements of the
Securities Exchange Act of 1934.75 Currently publicly traded companies are required to disclose
certain information regarding business dealings related to extractive operations to investors
through filings with the Securities and Exchange Commission (SEC). Section 1504 of the Dodd-
Frank Wall Street Reform and Consumer Protection Act of 2010 (P.L. 111-203) amended the
Securities Exchange Act of 1934 by expanding certain required public company disclosures.76

72 To help understand the role of the House of Representatives with respect to review of this Agreement, it is important
to clarify that this Agreement has not been submitted to the Senate as a treaty. Under the U.S. system, a legally binding
international agreement can take different forms. Unlike agreements taking the form of a treaty (that would enter into
force if approved by a two-thirds majority of the Senate and subsequently ratified by the President), this Agreement
was negotiated and signed by the Executive branch as a non-treaty. In the case of a non-treaty, to be legally binding, it
must either be authorized by a statute passed by Congress (“congressional executive agreements”) or a prior treaty
approved by the Senate, except when it concerns matters falling under the exclusive constitutional authority of the
President (“sole executive agreements”). For further discussion, see CRS Report RL32528, International Law and
Agreements: Their Effect upon U.S. Law, by Michael John Garcia.
73 H.R. 1613 was referred to three committees: Committee on Natural Resources; Committee on Foreign Affairs and
Committee on Financial Services. On June 6, 2013, the Committees on Foreign Affairs and Financial Services
discharged the bill.
74 In addition, H.R. 1613 offers placeholders for implementing Agreements with four other countries: Canada, Russia,
the Bahamas, and Bermuda. Although placeholders are sometimes included in bills that are introduced, they have rarely
been enacted as law.
75 Securities Exchange Act of 1934, 157 U.S.C. 78m(q).This section of the bill is summarized by Gary Shorter, CRS
Specialist in Financial Economics.
76 CRS Report R41350, The Dodd-Frank Wall Street Reform and Consumer Protection Act: Issues and Summary,
coordinated by Baird Webel.
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When applied to the commercial development of oil, natural gas, or minerals, the act requires the
disclosure of certain payments made to the federal government or foreign governments by public
companies required to file annual reports with the SEC. The provision in H.R. 1613, entitled
“Exemption from Resources Extraction,” provides that actions taken by such a public company
pertaining to any transboundary hydrocarbon Agreement shall be exempt from such disclosure
requirements.77
S. 81278
This bill would authorize the Secretary of the Interior to implement the Agreement consistent
with a legislative proposal referred to in the Administration’s 2014 budget request,79 Consistent
with this budget request, S. 812 would provide the Secretary of the Interior new authorities to
approve unitization agreements and related arrangements within certain guidelines. This approach
contrasts with H.R. 1613 in several respects.
A key distinction between the Senate and House bills is the difference regarding disclosure
requirements for investment information pursuant to U.S. Securities and Exchange Commission
(SEC) rules. These disclosure requirements are found in Section 13(q) of the Securities Exchange
Act of 1934.80 In contrast to the House bill discussed below, S. 812 is silent on this point, not
addressing the treatment of U.S. revenues with respect to U.S. firms and SEC obligations.
Worker Safety, Public Health, and Environmental Protection
Worker safety, public health, and environmental protection stemming from activities at marine
border areas presents special challenges, in part because international marine borders tend to be
geographically remote, resulting in limited options for equipment inspections, audits of worker
training and law enforcement coverage.81 These concerns about activities in offshore areas are
relevant to safety, health and environmental protection issues onshore because of the nature of air-
and waterborne pollutants and debris. At marine border areas, oil and gas facilities are subject to
regulation by the Bureau of Safety and Environmental Enforcement (BSEE), the DOI agency
responsible for federal inspections and reviewing oil spill response plans; and testing oil spill
containment equipment.82

77 In general, the American Petroleum Institute (API) and other business groups have resisted implementation of
Section 1504 of the Dodd-Frank Act. This resistance has been demonstrated by challenging SEC’s new rule requiring
publicly traded U.S. oil and gas companies to report information about projects that potentially could benefit their
overseas national oil companies.
78 Descriptions of SEC obligations were authored by Gary Shorter, CRS Specialist in Financial Economics.
79 See DOI FY2014 Budget Justifications at Budget Highlights p. 23. See also BOEM Office of Congressional Affairs
written communication to CRS May 16, 2013. This report uses available data from CBO and DOI. It does not address
the underlying questions surrounding either the quality, accuracy, or comprehensiveness of that data, or the
methodologies used to derive any of it.
80 157 U.S.C. 78m(q). See also http://thehill.com/blogs/e2-wire/e2-wire/296235-house-gop-moves-to-shield-oil-
companies-from-disclosure-rules#ixzz2RyR0jqGZ.
81 U.S. Government Accountability Office, Border Security: Additional Actions Needed to Better Ensure a Coordinated
Federal Response to Illegal Activity on Federal Lands, GAO-11-177, November 2010, pp. 9-10.
82 Bureau of Safety and Environmental Enforcement (BSEE, pronounced “Bessy”) is tasked with DOI oversight and
enforcement for offshore field operations, inspections, workforce safety, and decommissioning. Other than BSEE
authorities pursuant to OCSLA, BSEE responsibilities are governed by the National Environmental Policy Act of 1969
(continued...)
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While marine border activities may be governed by different federal missions (military,
diplomatic, trade) and involve various federal or international jurisdictions, agencies have been
required to integrate planning and regulatory compliance requirements to ensure that federal
decisions reflect values Americans place on worker safety and environmental protection.83
Sometimes departments—including DOI for example—have signed Memoranda of
Understanding (MOUs) on border issues that govern information sharing related to safety,
budgeting and access to federal lands, among other topics.84
Of particular interest to some in Congress might be how legislative initiatives discussed above
might ensure safety at the marine border by detailing strategies to address worker safety and
environmental protection.
Disbursement of Revenue Anticipated From U.S.-Mexico Projects
Consistent with various revenue management mechanisms that have evolved over the years, an
established percentage of federal revenues flows to federal and state projects in designated
portions of the Gulf of Mexico.85 Determining an acceptable division of revenue from future
offshore energy projects between coastal states and the federal government has proven to be a
difficult problem. When leased tracts on federal territory are at issue, coastal states argue that they
bear the brunt of remediating environmental impacts and infrastructure wear-and-tear
accompanying offshore oil and gas activity. Some states also harbor concern about international
development scenarios impacting shore-side communities and possibly increasing state-wide
costs related to water-dependent activities.
To date, OCS revenues have been a major source of funds for the Land and Water Conservation
Fund (LWCF) and the National Historic Preservation Fund (NHPF).86 State and federal entities
use these funds to acquire park and recreational lands. Thus far, U.S. review of the Agreement has
not examined values involved in an equitable distribution of public revenues, if any, related to
offshore projects managed jointly by the United States and Mexico.
At issue for Congress is whether statutory mandates related to nation-to-nation or federal-state
revenue sharing programs might be considered as part of U.S. review of this Agreement.

(...continued)
(NEPA P.L. 91-190; 42 U.S.C. §§ 4321-4347 and implementing regulations 40 C.F.R. Part 1500.
83 For more information on compliance with NEPA in relation to U.S. border programs, see CBP, “SBI Environmental
Documents,” http://www.cbp.gov/xp/cgov/border_security/otia/sbi_news/sbi_enviro_docs/. A related issue is the
authority, and litigation challenging the authority, related to waivers from environmental protection statutes.
84 For information on issues related to border barriers, see CRS Report R42138, Border Security: Immigration
Enforcement Between Ports of Entry, by Marc R. Rosenblum.
85 See Gulf of Mexico Energy Security Act of 2006 (GOMESA, P.L. 109-432).
86 The LWCF is a trust fund that accumulates $900 million at the end of each fiscal year. While most of the $900
million is derived from offshore revenues, additional monies have been provided by surplus property sales, and DOI
fees otherwise collected from public lands. The National Historic Preservation Act of 1966 establishes the Historic
Preservation Fund, made up annually of monies intended for matching grants to the states and to the National Trust for
Historic Preservation. These funds are not administered as typical “trust funds.” Both consist of monies that cannot be
spent unless appropriated by Congress. From FY1965 through FY2012 less than half the accumulated funds in the
LWCF has been appropriated. For more information see CRS Report RL33531, Land and Water Conservation Fund:
Overview, Funding History, and Issues, by Carol Hardy Vincent.
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Concentration of U.S. Leases in the Gulf of Mexico
Continuous federal oil and gas leasing in the Gulf of Mexico from the 1950s to the present has
contributed to a higher concentration of federal leases in the Gulf of Mexico region than in the
other three regions (Atlantic, Pacific and Alaska) combined. DOI reports most federally regulated
leases in the Gulf of Mexico remain undeveloped (showing no physical signs of development)
and while likely to generate rental receipts, these leases currently generate neither energy supplies
nor royalties.87
An issue attracting increased attention among some in Congress is how to cope with new leasing
options when so many leased tracts already exist. Some concerned about the number of
undeveloped U.S. leases question the benefits of leasing more acreage without examining the
significance, if any, of the backlog of undeveloped leased tracts. Others contend that with no
statutory limit on the number of undeveloped leases a leaseholder may own, there should be no
correlation between new leasing options and efforts to examine (or reduce) the number of existing
leases.
Disagreements related to so-called “idle leases” can stem from differing perspectives on the
values attached to the oil and gas leasing system in the U.S. Gulf of Mexico. Arguably, the value
of each lease (developed and undeveloped) is determined by the company owning the lease. In
theory, developed and undeveloped leases might play a role on an owner’s balance sheet––
providing operational and investment options that might include access to credit through liens or
mortgages or other attributes derived from accounting rules or the tax code.88
Attention to this issue has a tendency to wax and wane, with lawmaker interest increasing in
recent years.
Conclusion
Controversy surrounds most U.S. legislative initiatives to grant (or defer) offshore oil and gas
drilling rights. When these legislative deliberations touch on ocean drilling issues, a persistent
question among lawmakers is how to cope with myriad issues and competing interests at stake
when it comes to managing ocean resources.89 Of the breadth of issues and interests that might be
related to the proposed U.S.-Mexico Transboundary Hydrocarbons Agreement, this report has
focused on resource management issues, only addressing the competing national interests that
mainly involve balancing the demands of producing ocean energy supplies while protecting
marine and coastal resources and resources found in international waters beyond the U.S. EEZ.

87 Furthermore, in the absence of physical development, there is little to indicate BOEM and BSEE regulatory authority
relevant to the leases. GAO, Oil and Gas Leasing: Interior Could Do More to Encourage Diligent Development, GAO-
09-74 (Washington, D.C.: Oct. 3, 2008). See also Oil and Gas Lease Utilization, Onshore and Offshore Updated
Report to the President DOI (May 2012).
88 In theory, important tax implications can stem from how taxpayers with OCS leases determine their value.
Specifically, the character of any losses or gains (e.g., capital asset or ordinary income, carried interest) associated with
OCS leases could, in theory, be a factor for some firms maintaining an increasing number of undeveloped tracts.
89 The offshore drilling debate is a combination of several discrete debates about oil and gas leasing activity in federal
and international waters. Congress addresses multiple issues related to access (state-federal consultations about state
revenue sharing, adequacy of environmental reviews, timetables for drilling permitting, operational safety, federal
receipts and disbursements to federal programs, research).
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While the Obama Administration has stated the Agreement is part of engaging Mexico in a host
of related energy and environmental partnerships, asserting that the benefits of this Agreement
outweigh potential risks, skeptics have voiced doubt that the Agreement ensures an emphasis on
rigorous safety measures on both sides of the border.90 Related issues include how to handle
public receipts (royalties and other gains), if any, anticipated from jointly managed ocean energy
projects and how to cope with oil spill risks and other risks associated with a joint development
scenario.
Recent activities in the House highlight a policy divide that accompanies legislative review of this
Agreement.91 Arguably, positions expressed about legislation to accept and implement the
Agreement reflect two camps: one focusing on the benefits of maintaining the moratorium on
ocean drilling and the other focusing on gains anticipated from options to generate new energy
supplies and public revenues.
Many of these arguments highlight external factors associated with U.S.-Mexico relations.92
However, some arguments are reminiscent of the historic choices faced by U.S. lawmakers in the
past about whether and where to allow ocean drilling and how to monitor development scenarios
where permissible.
As the expiration of the moratorium draws closer, pressure may increase for lawmakers and
diplomatic officials on both sides of the border to find an acceptable policy alternative for
achieving a safe, responsible and sustainable future for U.S. and Mexican ocean energy portfolios
in the Gulf of Mexico. With no schedule in place for further U.S. review of the proposed
Agreement, it is difficult to predict whether Congress might defer attention to the Agreement or
undertake further U.S. review.

90 See, for example, Greenpeace, Transboundary Agreement Spells Disaster for the Gulf, February 22, 2012.
91 H. Rept. 113-101, including Dissenting Views.
92 For a comprehensive discussion of U.S.-Mexican relations see CRS Report R42917, Mexico’s Peña Nieto
Administration: Priorities and Key Issues in U.S.-Mexican Relations, by Clare Ribando Seelke.
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Appendix. Summary of Hearings in the House
Both House hearings discussed below were conducted prior to lawmakers introducing the bills
discussed elsewhere in this report. Absent the opportunity to parse introduced legislation,
witnesses mainly offered general statements relevant to the proposed Agreement. As a result these
hearings were free of the more precise legislative analysis and stakeholder discussion that can
come from review directly related to pending legislation.93
House Committee on Foreign Affairs
On March 14, 2013, the House Committee on Foreign Affairs, Subcommittee on the Western
Hemisphere held a hearing entitled U.S. Energy Security: Enhancing Partnerships with Mexico
and Canada.94 At the hearing the four witnesses representing academia and private sector firms95
claimed U.S. approval of the Agreement would impact U.S. and Mexican interests through one or
more of the following considerations:
• “Approving the treaty will create new levels of legal certainty for U.S.
and Mexican firms operating in the Gulf border regions, encouraging them to
engage in the risk-taking required to produce oil from deep waters ... ”96
• “Swift ratification of the Transboundary Hydrocarbon Agreement is important to
our nation’s energy security and long-term economic growth.”97
• “The current focus on hydrocarbon reform in Mexico also means that extended
U.S. inaction on the Transboundary Hydrocarbons Agreement will be noticed,
with potentially negative consequences for the broader bilateral relationship.”98
House Committee on Natural Resources
On April 25, 2013, the House Committee on Natural Resources, Subcommittee on Energy and
Mineral Resources held a legislative and oversight hearing entitled “U.S.-Mexico Transboundary
Hydrocarbon Agreement and Steps Needed for Implementation.”99 At this hearing six witnesses
representing federal agencies, private firms, academia, and an internationally recognized

93 This Agreement has been characterized as very technical in nature, as compared to earlier U.S.-Mexico compacts
related to governance of acreage in western Gulf of Mexico. For a discussion detailing the technical aspects of the
Agreement see U.S.-Mexico Agreement on Transboundary Hydrocarbon Reservoirs in the Gulf of Mexico: A Blueprint
for Progress or a Recipe for Conflict? by Jorge A Vargas, (San Diego International Law Journal Fall, 2012).
94 See http://foreignaffairs.house.gov/hearing/subcommittee-hearing-us-energy-security-enhancing-partnerships-
mexico-and-canada.
95 Witnesses included Duncan Wood, Ph.D., Director, Mexico Institute, The Wilson Center; Daniel R. Simmons,
Director of Regulatory and State Affairs, Institute for Energy Research; Kyle Isakower, Vice President, Regulatory and
Economic Policy, American Petroleum Institute; Michael A. Levi, Ph.D., Senior Fellow for Energy and the
Environment, and Director of the Program on Energy Security and Climate Change, Council on Foreign Relations. No
Administration witness was on the panel.
96 Testimony of Duncan Wood.
97 Testimony of Kyle Isakower.
98 Testimony of Michael Levi.
99 See http://foreignaffairs.house.gov/hearing/subcommittee-hearing-us-energy-security-enhancing-partnerships-
mexico-and-canada.
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environmental organization offered perspectives on U.S. involvement in the Agreement.100 With
one exception, witnesses voiced support for the Agreement and draft legislation, by claiming that
U.S. acceptance of the Agreement offered greater legal certainty for U.S. energy interests in the
Gulf of Mexico. The one exception was Mr. Manuel, Sierra Club, arguing that the proposed
Agreement was not needed due to the backlog of U.S. leases already in effect in the Gulf of
Mexico.101 Witnesses asserted varying perspectives on the Agreement, based on one or more of
the following considerations:
• The Agreement permits, for the first time, firms on the U.S. side of the border to
cooperate with Mexico’s national oil company, Petróleos Mexicanos (PEMEX)
on joint exploration and development projects.102
• The Agreement allows more numerous options for U.S. oil and natural gas
companies to invest in and to operate in the Gulf of Mexico, creating jobs and
enhancing U.S. energy security.103
• Lacking specifics about safety and environmental protection, it remains unclear
whether the Agreement is compatible with U.S. interests in fishing and tourism in
the Gulf of Mexico.104
Of the witnesses testifying in favor of legislative review and acceptance of the Agreement, each
cited clarifying U.S.-Mexico relations with respect to governing the transboundary area was
needed for safe and responsible energy development to commence. In contrast to the testimony of
these witnesses, the Sierra Club witness expressed skepticism that swift U.S. acceptance was
needed “given that the oil and gas industry is sitting on a large number of inactive leases in
federal waters, proving accelerated leasing in the Gulf of Mexico to be unnecessary.”105
Following these hearings, legislation (S. 812, H.R. 1613) was introduced in both chambers on
April 25, 2013. This legislation would approve and implement the proposed Agreement taking
slightly differing approaches.106

100 Witnesses included Tommy Beaudreau, Acting Assistant Secretary for Land and Minerals Management U.S.
Department of the Interior (DOI); Ambassador Carlos Pascual, Special Envoy and Coordinator for International Energy
Affairs U.S. Department of State (DOS); Erik Milito, American Petroleum Institute; Daniel R. Simmons, Institute for
Energy Research; Steven Groves, Heritage Foundation; and, Athan Manuel, Sierra Club.
101 Sierra Club statement is found at http://naturalresources.house.gov/uploadedfiles/manueltestimony04-25-13.pdf.
102 This point was made by both Mr. Beaudreau (DOI) and Ambassador Pascual (DOS). For the complete written
testimony of both witnesses see http://naturalresources.house.gov/uploadedfiles/beaudreautestimony04-25-13.pdf and
http://naturalresources.house.gov/uploadedfiles/pascualtestimony04-25-13.pdf.
103 This point was made by both Mr. Milito and Mr. Groves. For the complete written testimony of both witnesses see
http://naturalresources.house.gov/uploadedfiles/militotestimony04-25-13.pdf and http://naturalresources.house.gov/
uploadedfiles/grovestestimony04-25-13.pdf.
104 This point was made by Mr. Manuel. For the complete Sierra Club statement see http://naturalresources.house.gov/
uploadedfiles/manueltestimony04-25-13.pdf.
105 See Sierra Club written testimony, p. 3. For further information on offshore acreage leased but not producing see
Oil and Gas Lease Utilization – Onshore and Offshore, Report to the President, U.S. Department of the Interior
(March, 2011) found at http://www.doi.gov/news/pressreleases/loader.cfm?csModule=security/getfile&pageid=
239255.
106 These bills are summarized in the section of this report entitled “Pending Legislation.”
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Author Contact Information

Curry L. Hagerty
James C. Uzel
Specialist in Energy and Natural Resources Policy
Geospatial Information Systems Analyst
chagerty@crs.loc.gov, 7-7738
juzel@crs.loc.gov, 7-6830

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