United States Assessments of Undiscovered Oil and Gas Resources
Explore US Undiscovered Oil and Gas Assessment Provinces
Assessment results, publications, data and more are available
click here to launchAssessment Overview
The USGS assesses potential for undiscovered oil and gas resources in priority geologic provinces in the United States. This website highlights conventional and unconventional (continuous) oil and gas assessments.
Summary of Continuous Assessments
This applications shows maps and tables of all continuous assessments in the United States.
Click here to launchRecent Assessments
Below are the latest US Assessments:
2019 Appalachian Basin Province
2018 Eastern Great Basin Province
2018 Uinta-Piceance Basin/Tight-Gas of Mesaverde and Wasatch
2018 Wind River Basin - Niobrara interval of the Cody Shale
2018 Wolfcamp Shale of Delaware Basin, Permian Basin Province
Browse AssessmentsScience Center Objects
USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States and the World (click here for information about World Oil and Gas Assessments). This website provides access to new, prioritized, assessment results and supporting data for the United States, as part of the Energy Policy and Conservation Act (EPCA).
National Oil and Gas Assessment Methodology
The U.S. Geological Survey Energy Resources Program assesses the potential for undiscovered oil and gas resources in priority geologic provinces in the United States and around the world. Two methodologies are used by the USGS; one for assessing conventional oil and gas resources and one for assessing unconventional (continuous) oil and gas resources (such as shale gas and coalbed gas). USGS publications detailing and explaining the conventional and continuous assessment methodologies are provided below. These methodologies have been subjected to rigorous peer reviews by non federal panels, and the two panel reports are provided on this page.
Conventional Resources
USGS Reports
U.S. Geological Survey Assessment Concepts for Conventional Petroleum Accumulations
By James W. Schmoker and T.R. Klett
U.S. Geological Survey Input-Data Form and Operational Procedure for the Assessment of Conventional Petroleum Accumulations
By T.R. Klett, James W. Schmoker, and Ronald R. Charpentier
A Monte Carlo Simulation Method for the Assessment of Undiscovered, Conventional Oil and Gas
By Ronald R. Charpentier and T.R. Klett
Continuous Resources
USGS Reports
U.S. Geological Survey Assessment Concepts for Continuous Petroleum Accumulations
By James W. Schmoker
U.S. Geological Survey Input-Data Form and Operational Procedure for the Assessment Of Continuous Petroleum Accumulations, 2002
By T.R. Klett and James W. Schmoker
Analytic Resource Assessment Method for Continuous Petroleum Accumulations—The ACCESS Assessment Method
By Robert A. Crovelli
FORSPAN Model Users Guide
By T.R. Klett, and Ronald R. Charpentier
Methodology Revisions
Improved USGS methodology for assessing continuous petroleum resources.
Charpentier, R.R., and Cook, T.A.
Applying Probabilistic Well-Performance Parameters to Assessments of Shale-Gas Resources
By Ronald R. Charpentier and Troy Cook
Assembling Probabilistic Performance Parameters of Shale-Gas Wells
By Cook, Troy, and Charpentier, R.R.
USGS Methodology for Assessing Continuous Petroleum Resources
By Ronald R. Charpentier and Troy Cook
New U.S. Geological Survey Method for the Assessment of Reserve Growth
By Timothy R. Klett, Emil D. Attanasi, Ronald R. Charpentier, Troy A. Cook, Philip A. Freeman, Donald L. Gautier, Phuong A. Le, Robert T. Ryder, Christopher J. Schenk, Marilyn E. Tennyson, and Mahendra K. Verma (Reserve Growth Assessment Team)
Variability of Distributions of Well-Scale Estimated Ultimate Recovery for Continuous (Unconventional) Oil and Gas Resources in the United States
By U.S. Geological Survey Oil and Gas Assessment Team
Peer Review
Reserve Growth Methodology
USGS Reports
New U.S. Geological Survey Method for the Assessment of Reserve Growth
By Reserve Growth Assessment Team
Reserve Growth of Oil and Gas Fields - Investigations and Applications
By Troy Cook
Peer Review
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Date published: August 28, 2018Status: ActiveAlaska Petroleum Systems
The Alaska Petroleum Systems project has three main objectives:
(A) conduct research that increases our understanding of Alaska petroleum systems,
(B) conduct assessments of undiscovered oil and gas resources, and
(C) deliver energy-resource information to land and resource managers, policy makers, and the public.Contacts: David W Houseknecht -
Date published: November 16, 2018Status: ActiveWestern Oregon-Washington Oil and Gas Assessments
The U.S. Geological Survey completed the following assessments of undiscovered oil and gas resources of the Western Oregon and Washington Province 5004:
- 2009 Conventional and Continuous Assessment (Fact Sheet 2009-3060, DDS 69-X).
- 1995 Assessment ( ...
Contacts: Christopher J Schenk -
Date published: November 16, 2018Status: ActiveEastern Oregon-Washington Oil and Gas Assessments
In 2006, the U.S. Geological Survey (USGS) completed the following assessments of undiscovered gas resources of the Eastern Oregon and Washington Province 5005.
2006 . This province was previously assessed in 1995 ( see DD
- 2006 Assessment (Fact Sheet 2006-3091 ...
Contacts: Christopher J Schenk -
Date published: July 19, 2018Status: ActiveAppalachian Basin Oil and Gas Assessments
The USGS has conducted numerous assessments of undiscovered oil and gas in the Appalachian Basin, including studies of the Marcellus Shale. The region extends from Alabama to Maine. The following is an overview of the assessments:
- 2019 Ordovician Point Pleasant Formation and Utica Shale (FS 2019-3044)
- 2019 ...
Contacts: Christopher J Schenk -
Date published: August 9, 2018Status: ActiveGulf Coast Petroleum Systems Project - Assessments
This site highlights the assessments of the Gulf Coast Petroleum Systems Project. Scientifically robust assessments of undiscovered, technically recoverable hydrocarbon resources are published in a variety of USGS publications. This project also conducts research on the processes that impact the formation, accumulation, occurrence and alteration of hydrocarbon energy resources (...
Contacts: William H Craddock, Justin Birdwell -
Date published: November 1, 2018Status: ActivePermian Basin Oil and Gas Assessments
The USGS has conducted several assessments of undiscovered oil and gas in formations in the Permian Basin of western Texas. This inlcudes the following:
Contacts: Stephanie Gaswirth, Ph.D. -
Date published: November 8, 2018Status: ActiveWilliston Basin Oil and Gas Assessments
The U.S. Geological Survey completed the following assessments of conventional and continuous oil and gas resources of the Devonian Three Forks Formation and Devonian and Mississippian Bakken Formation in the Williston Basin Province 5031 of North Dakota, Montana, and South Dakota:
- 2013 Conventional and Continuous Assessment ( ...
Contacts: Stephanie Gaswirth, Ph.D. -
Date published: November 30, 2018Status: ActiveNorthern Coastal Oil and Gas Assessments
The U.S. Geological Survey completed the following assessment of undiscovered oil and gas resources of the Northern Coastal Province 5007:
- 1995 Assessment (DDS-30).
Contacts: Christopher J Schenk -
Date published: November 30, 2018Sonoma-Livermore Basin Oil and Gas Assessments
The U.S. Geological Survey completed the following assessment of undiscovered oil and gas resources of the Sonoma-Livermore Province 5008:
- 1995 Assessment (DDS-30).
Contacts: Christopher J Schenk -
Date published: November 19, 2018Status: ActiveSacramento Basin Oil and Gas Assessments
The U.S. Geological Survey completed the following assessments of undiscovered natural gas resources of the Sacramento Basin Province of California 5008:
- 2006 Conventional and Continuous Assessment (Fact Sheet 2007-3014).
- 1995 Assessment ( ...
Contacts: Christopher J Schenk
Assessment of undiscovered continuous oil and gas resources in the Upper Ordovician Point Pleasant Formation and Utica Shale of the Appalachian Basin Province, 2019
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable continuous mean resources of 1.8 billion barrels of oil and 117.2 trillion cubic feet of gas in the Upper Ordovician Point Pleasant Formation and Utica Shale of the Appalachian Basin Province.
Enomoto, Catherine B.; Trippi, Michael H.; Higley, Debra K.; Drake, Ronald M.; Gaswirth, Stephanie B.; Mercier, Tracey J.; Brownfield, Michael E.; Leathers-Miller, Heidi M.; Le, Phuong A.; Marra, Kristen R.; Tennyson, Marilyn E.; Woodall, Cheryl A.; Schenk, Christopher J.
Assessment of undiscovered gas resources in the Middle Devonian Marcellus Shale of the Appalachian Basin Province, 2019
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable continuous mean resources of 96.5 trillion cubic feet of gas in the Middle Devonian Marcellus Shale of the Appalachian Basin Province.
Higley, Debra K.; Enomoto, Catherine E; Leathers-Miller, Heidi M.; Ellis, Geoffrey S.; Mercier, Tracey J.; Schenk, Christopher J.; Trippi, Michael H.; Le, Phuong A.; Brownfield, Michael E.; Woodall, Cheryl A.; Marra, Kristen R.; Tennyson, Marilyn E.
Assessment of continuous oil resources in the Eastern Great Basin Province of Nevada, Utah, and Idaho, 2018
The U.S. Geological Survey (USGS) quantitatively assessed the potential for undiscovered, technically recoverable continuous oil and gas resources in the Eastern Great Basin Province (Anna and others, 2007) of Nevada, Utah, and Idaho (fig. 1). The assessment focused on the area of the province between the Roberts Mountains and...
Schenk, Christopher J.; Mercier, Tracey J.; Woodall, Cheryl A.; Finn, Thomas M.; Gaswirth, Stephanie B.; Marra, Kristen R.; Le, Phuong A.; Brownfield, Michael E.; Leathers-Miller, Heidi M.; Drake, Ronald M.; Kinney, Scott A.
Assessment of undiscovered continuous tight-gas resources in the Mesaverde Group and Wasatch Formation, Uinta-Piceance Province, Utah and Colorado, 2018
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 24 trillion cubic feet of gas in the Mesaverde Group and Wasatch Formation of the Uinta-Piceance Province in northeast Utah and northwest Colorado.
Drake, Ronald M.; Schenk, Christopher J.; Mercier, Tracey J.; Le, Phuong A.; Finn, Thomas M.; Johnson, Ronald C.; Woodall, Cheryl A.; Gaswirth, Stephanie B.; Marra, Kristen R.; Pitman, Janet K.; Leathers-Miller, Heidi M.; Haines, Seth S.; Tennyson, Marilyn E.
Structure contour and overburden maps of the Niobrara interval of the Upper Cretaceous Cody Shale in the Wind River Basin, Wyoming
The Wind River Basin in central Wyoming is one of many structural and sedimentary basins that formed in the Rocky Mountain foreland during the Laramide orogeny. The basin is bounded by the Washakie, Owl Creek, and southern Bighorn uplifts on the north, the Casper arch on the east, the Granite Mountains uplift on the south, and Wind...
Finn, Thomas M.
Stratigraphic cross sections of the Niobrara Interval of the Upper Cretaceous Cody Shale in the Bighorn Basin, Wyoming and Montana
The Bighorn Basin is one of many structural and sedimentary basins that formed in the Rocky Mountain foreland during the Laramide orogeny. The basin is nearly 180 miles long, 100 miles wide, and encompasses about 10,400 square miles in northern Wyoming and southern Montana. The basin is bounded by major basement uplifts that include the Pryor...
Finn, Thomas M.
Assessment of undiscovered oil and gas resources in the South Florida basin, 2016
Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean undiscovered, technically recoverable resources of 49 million barrels of oil and 18 billion cubic feet of gas in the onshore and State waters part of the South Florida basin.
Roberts-Ashby, Tina L.; Hackley, Paul C.; Lohr, Celeste D.; Schenk, Christopher J.; Mercier, Tracey J.; Whidden, Katherine J.; Le, Phuong A.; Tennyson, Marilyn E.; Gaswirth, Stephanie B.; Woodall, Cheryl A.; Brownfield, Michael E.; Leathers-Miller, Heidi M.; Marra, Kristen R.; Finn, Thomas M.
Assessment of continuous oil and gas resources in the Niobrara interval of the Cody Shale, Wind River Basin Province, Wyoming, 2018
Using a geology-based assessment methodology, the U.S. Geological Survey estimated means of 528 million barrels of oil and 2 trillion cubic feet of gas in the Niobrara interval of the Cody Shale in the Wind River Basin Province, Wyoming.
Finn, Thomas M.; Schenk, Christopher J.; Mercier, Tracey J.; Tennyson, Marilyn E.; Le, Phuong A.; Brownfield, Michael E.; Marra, Kristen R.; Leathers-Miller, Heidi M.; Drake, Ronald M.; Woodall, Cheryl A.; Kinney, Scott A.
Assessment of undiscovered continuous oil and gas resources in the Wolfcamp Shale and Bone Spring Formation of the Delaware Basin, Permian Basin Province, New Mexico and Texas, 2018
Using a geology-based assessment methodology, the U.S. Geological Survey assessed undiscovered, technically recoverable continuous mean resources of 46.3 billion barrels of oil and 281 trillion cubic feet of gas in the Wolfcamp shale and Bone Spring Formation of the Delaware Basin in the Permian Basin Province, southeast New Mexico and west Texas.
Gaswirth, Stephanie B.; French, Katherine L.; Pitman, Janet K.; Marra, Kristen R.; Mercier, Tracey J.; Leathers-Miller, Heidi M.; Schenk, Christopher J.; Tennyson, Marilyn E.; Woodall, Cheryl A.; Brownfield, Michael E.; Finn, Thomas M.; Le, Phuong A.
U.S. Geological Survey input-data forms for the assessment of the Upper Jurassic Bossier Formation, U.S. Gulf Coast, 2016
IntroductionIn 2016, the U.S. Geological Survey (USGS) completed an updated assessment of undiscovered, technically recoverable oil and gas resources in the Upper Jurassic Bossier Formation of the onshore U.S. Gulf Coast Province (Paxton and others, 2017). The Bossier Formation was assessed using both the standard continuous (unconventional) and...
Paxton, Stanley T.; Pitman, Janet K.; Kinney, Scott A.; Gianoutsos, Nicholas J.; Pearson, Ofori N.; Whidden, Katherine J.; Dubiel, Russell F.; Schenk, Christopher J.; Burke, Lauri A.; Klett, Timothy R.; Leathers-Miller, Heidi M.; Mercier, Tracey J.; Haines, Seth S.; Varela, Brian A.; Le, Phuong A.; Finn, Thomas M.; Gaswirth, Stephanie B.; Hawkins, Sarah J.; Marra, Kristen R.; Tennyson, Marilyn E.
U.S. Geological Survey input-data forms for the assessment of the Upper Jurassic Haynesville Formation, U.S. Gulf Coast, 2016
IntroductionIn 2016, the U.S. Geological Survey (USGS) completed an updated assessment of undiscovered, technically recoverable oil and gas resources in the Upper Jurassic Haynesville Formation of the onshore U.S. Gulf Coast Province (Paxton and others, 2017). The Haynesville Formation was assessed using both the standard continuous (...
Paxton, Stanley T.; Pitman, Janet K.; Kinney, Scott A.; Gianoutsos, Nicholas J.; Pearson, Ofori N.; Whidden, Katherine J.; Dubiel, Russell F.; Schenk, Christopher J.; Burke, Lauri A.; Klett, Timothy R.; Leathers-Miller, Heidi M.; Mercier, Tracey J.; Haines, Seth S.; Varela, Brian A.; Le, Phuong A.; Finn, Thomas M.; Gaswirth, Stephanie B.; Hawkins, Sarah J.; Marra, Kristen R.; Tennyson, Marilyn E.
Assessment of undiscovered continuous oil and gas resources in the Upper Cretaceous Tuscaloosa marine shale of the U.S. Gulf Coast, 2018
Using a geology-based assessment methodology, the U.S. Geological Survey assessed mean undiscovered, technically recoverable continuousresources of 1.5 billion barrels of oil and 4.6 trillion cubic feet of gas in the Upper Cretaceous Tuscaloosa marine shale in onshore and State waters ofLouisiana, Mississippi, Alabama, and Florida in the U.S. Gulf...
Hackley, Paul C.; Enomoto, Catherine B.; Valentine, Brett J.; Rouse, William A.; Lohr, Celeste D.; Dulong, Frank T.; Hatcherian, Javin J.; Brennan, Sean T.; Craddock, William H.; Finn, Thomas M.; Gaswirth, Stephanie B.; Le, Phuong A.; Leathers-Miller, Heidi M.; Marra, Kristen R.; Mercier, Tracey J.; Paxton, Stanley T.; Whidden, Katherine J.; Woodall, Cheryl A.; Schenk, Christopher J.-
Date published: March 25, 2019Downloadable Data for National Oil and Gas Assessments
GIS Data for the National Oil and Gas Assessments
Attribution: Central Energy Resources Science Center
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Date published: January 1, 2018USGS Alaska Petroleum Systems Project: Northern Alaska Province, Nanushuk and Torok Formations Assessment Units and Assessment Input Forms
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a...
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Date published: January 1, 2018
USGS Gulf Coast Petroleum Systems, and National and Global Oil and Gas Assessment Projects - USGS Province 50 Assessment Unit Boundaries and Assessment Input Forms
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a...
Attribution: Florence Bascom Geoscience Center -
Date published: January 1, 2018
USGS National and Global Oil and Gas Assessment Project-Appalachian Basin Province, Upper Devonian Shales Assessment Unit Boundaries and Assessment Input Forms
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a...
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Date published: January 1, 2018
USGS National and Global Oil and Gas Assessment Project-Permian Basin Province, Delaware Basin, Wolfcamp Shale and Bone Spring Assessment Units and Input Data
This data release contains the boundaries of assessment units and input data for the assessment of undiscovered oil and gas in the Delaware Basin, Wolfcamp Shale and Bone Spring. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total...
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Date published: January 1, 2018
USGS National and Global Oil and Gas Assessment Project-Permian Basin Province, Midland Basin, Spraberry Formation Assessment Units
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a...
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Date published: August 28, 2018USGS Domestic Continuous (Unconventional) Oil & Gas Assessments, 2000-Present
Interactively explore assessment summary information for continuous (unconventional) assessments conducted at the USGS from 2000-2018. The assessment results data used to generate this visualization can be downloaded here in Excel Format. These data represent all assessment results...
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Date published: January 1, 2019
USGS Gulf Coast Petroleum Systems, and National and Global Oil and Gas Assessment Projects-Eagle Ford Group and Associated Cenomanian-Turonian Strata Assessment Unit Boundaries and Assessment Input Data Forms
This data release contains the boundaries of assessment units and input data for the assessment of undiscovered oil and gas in the Eagle Ford group and Associated Cenomanian-Turonian Strata, Texas Gulf Coast. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the...
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Date published: January 1, 2019
USGS National and Global Oil and Gas Assessment Project - Appalachian Basin Province, Middle Devonian Marcellus Shale Assessment Units and Input Data Forms
This data release contains the boundaries of assessment units and input data for the assessment of undiscovered gas resources in the Middle Devonian Marcellus Shale of the Appalachian Basin Province, 2019. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the...
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Date published: January 1, 2019
USGS National and Global Oil and Gas Assessment Project - Appalachian Basin Province, Point Pleasant Formation and Utica Shale Assessment Unit Boundaries and Assessment Input Data Forms
This data release contains the boundaries of assessment units and input data for the assessment of undiscovered gas hydrate resources on the north slope of Alaska. The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum...
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Date published: January 1, 2019
USGS National and Global Oil and Gas Assessment Project - Permian Basin Province, Midland Basin, Wolfcamp Shale Assessment Unit Boundaries and Assessment Input Data Forms, Version 2.0
The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a...
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Date published: March 19, 2019Explore US Oil and Gas Assessments
This map shows the provinces assessed by the USGS for undiscovered oil and gas resources.
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Date published: November 28, 2018USGS Announces Largest Continuous Oil Assessment in Texas and New Mexico
Estimates Include 46.3 Billion Barrels of Oil, 281 Trillion Cubic feet of Natural Gas, and 20 Billion Barrels of Natural Gas Liquids in Texas and New Mexico’s Wolfcamp Shale and Bone Spring Formation.
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Date published: June 22, 2018USGS Estimates Oil and Gas in Texas’ Eagle Ford Group
The Eagle Ford Group of Texas contains estimated means of 8.5 billion barrels of oil, 66 trillion cubic feet of natural gas, and 1.9 billion barrels of natural gas liquids, according to a new assessment by the U.S. Geological Survey. This estimate consists of undiscovered, technically recoverable resources in continuous accumulations.
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Date published: April 10, 2008
3 to 4.3 Billion Barrels of Technically Recoverable Oil Assessed in North Dakota and Montana’s Bakken Formation—25 Times More Than 1995 Estimate—
North Dakota and Montana have an estimated 3.0 to 4.3 billion barrels of undiscovered, technically recoverable oil in an area known as the Bakken Formation.
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What are the different columns on a USGS oil and gas resource assessment table?
The USGS uses a statistically-based process to calculate the likely range of its estimate. The range of values extends from a 5% or greater likelihood of occurrence (the F5 value, or largest estimated value) to less than 95% likelihood of occurrence (the F95 value, or smallest estimated value). The F50 column is the value that occurs when 50% of... -
What are "technically recoverable" oil and gas resources?
“Technically recoverable” means that the oil and/or gas can be produced using currently available technology and industry practices. This is regardless of any economic or accessibility considerations. For example, the technology required to produce oil from a location might exist, but it costs more than the oil is worth. The oil is still... -
Why have some estimates of undiscovered technically recoverable oil or gas changed so much from previous estimates?
Petroleum geologists have long known that oil and gas resources were present in “tight” or impermeable formations such as shale. But there was no feasible way to extract that oil and gas, so they were not “technically recoverable” and were not included in USGS assessment results. Thanks to new technologies, oil and gas can now be extracted from “... -
When did hydraulic fracturing become such a popular approach to oil and gas production?
Hydraulic fracturing in vertical wells has been used for over fifty years to improve the flow of oil and gas from conventional reservoirs. However, the current practice of horizontal drilling coupled with multiple applications of hydraulic fracturing in a single well was pioneered in the late 1980s and has continued to evolve. Since the final... -
Where in the United States is hydraulic fracturing being used for oil and gas extraction?
Hydraulic fracturing is used in many established oil and gas producing regions of the country as well as some areas new to the petroleum industry. Maps of major shale gas, tight gas, and tight oil basins are available from the U.S. Energy Information Administration, although not all of the shale basins shown currently have production. -
Are other countries using hydraulic fracturing for oil and gas extraction?
Yes, hydraulic fracturing is being used extensively in Canada and is increasingly being used in countries in Asia, Europe, and South America.