Chapter 2

Tabular Data and Graphical Images in 

Support of the U.S. Geological Survey 

National Oil and Gas Assessment—

Powder River Basin Province (5033)

By T.R. Klett and P.A. Le

Chapter 2 of

Total Petroleum Systems and Geologic Assessment of Oil and 

Gas Resources in the Powder River Basin Province, 

Wyoming and Montana

By U.S. Geological Survey Powder River Basin Assessment Team

U.S. Geological Survey Digital Data Series DDS–69–U

U.S. Department of the Interior

U.S. Geological Survey

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Volume Title Page
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2010

Revised: April 2010

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U.S. Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Klett, T.R., Le, P.A., 2010, Tabular data and graphical images in support of the U.S. Geological Survey National Oil 

and Gas Assessment—Powder River Basin Province (5033), in Total Petroleum Systems and Geologic Assessment 

of Oil and Gas Resources in the Powder River Basin Province, Wyoming and Montana: U.S. Geological Survey Series 

DDS–69–U, chap. 2, 20 p. Revised April 2010.
iii

Contents

Introduction.....................................................................................................................................................1

Disclaimers .....................................................................................................................................................1

Data Sources..................................................................................................................................................1

Data Overview................................................................................................................................................2

Data Tables ............................................................................................................................................2

Summary Tables....................................................................................................................................2

Graphs.....................................................................................................................................................2

Numeric Codes...............................................................................................................................................2

Summary Tables....................................................................................................................................3

Graphical Data................................................................................................................................................3

File List.............................................................................................................................................................4

Tabular Data....................................................................................................................................................5

References Cited..........................................................................................................................................20

Note: Individual .pdf file names are listed on page 4–5 and are linked to the respective .pdf files
Tabular Data and Graphical Images in Support of the U.S. 

Geological Survey National Oil and Gas Assessment—

Powder River Basin Province (5033)

By T.R. Klett and P.A. Le

Introduction

This chapter describes data used in support of the process being applied by the U.S. Geological Survey (USGS) National 

Oil and Gas Assessment (NOGA) project. Digital tabular data used in this report and archival data that permit the user to perform further analyses are available in the PDF and TAB files folder within the REPORTS folder on this CD–ROM. Computers 

and software may import the data without transcription from the Portable Document Format files (.pdf files) of the text by the 

reader. Because of the number and variety of platforms and software available, graphical images are provided as .pdf files and 

tabular data are provided in a raw form as tab-delimited text files (.tab files).

Disclaimers

This publication was prepared by an agency of the United States Government. Reference therein to any specific commercial 

product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its 

endorsement, recommendation, or favoring by the United States Government or any agency thereof.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of 

these data or related materials.

Data Sources

Crude oil and natural gas production data (including all volumetric and descriptive data such as cumulative production, 

remaining reserves, known recoverable volumes, major producing reservoirs, and petroleum type) and historical data (including 

field-discovery dates, well-completion dates, exploration objectives, and well depths) for fields, reservoirs, and wells are derived 

from commercial databases leased and (or) purchased by the USGS, including (1) PI/Dwights Plus US Production Data (IHS 

Energy Group, 2006a), (2) PI/Dwights Plus US Well Data (IHS Energy Group, 2006b), (3) NRG Associates, Inc., “Significant 

Oil and Gas Fields of the United States” (NRG Associates, 2005), as well as older versions of these databases. Data from these 

databases are subject to proprietary constraints, but derivative representations in the form of graphs and summary statistics are 

allowed to be published and were prepared for each assessment unit. To supplement commercial databases, additional data are 

obtained, where available, from operators, other Federal and State agencies, or published geological reports.

The PI/Dwights Plus US Production database provides production data for wells, leases, or production units. The PI/

Dwights Plus US Well database provides individual well data (including data for dry holes), including well identifications, 

locations, initial and final well status classifications, completion dates, and information on penetrated formations. The NRG 

Associates, Inc., “Significant Oil and Gas Fields of the United States” database provides volumetric and production data for 

fields and reservoirs.
2 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

Data Overview

This report provides various data files supporting the NOGA project. The files contain data that are the source for the 

various graphs, data tables, and summary tables used in the assessment process. Tabular data are provided as tab-delimited 

text files (.tab files), usable in spreadsheet and database software. Graphical and summary data are provided as Portable 

Document Format files (.pdf files). File name conventions are as follows:

Data Tables

eco####.tab

fed####.tab

own####.tab

sta####.tab

vol####.tab

inf####.tab

ins####.tab

kvol####.tab

Summary Tables

c######.pdf

d######.pdf

u######.pdf

Graphs

em######.pdf

fp######.pdf

g######.pdf

k######.pdf

For identification purposes, numbers in the positions occupied by the four symbols “####” represent the province code. 

Files with these numbers contain data for the entire province. Files having numbers in the positions occupied by the six symbols “######” (which represent the last six digits of the assessment-unit code) contain data only for that assessment unit.

Numeric Codes

A hierarchical numeric code identifies each region, province, total petroleum system, and assessment unit. The criteria 

for assigning codes are uniform throughout the NOGA project and throughout all resulting publications. The numeric codes 

used in this study are listed below.

Unit Name Code

Region North America 5

Province Powder River Basin 5033

Total Petroleum System Cretaceous-Tertiary Composite 503301

Mowry 503302

Niobrara 503303

Cretaceous Biogenic Gas 503304

Pennsylvanian-Permian Composite 503305

Paleozoic-Mesozoic Composite 503306

Assessment Units Eastern Basin Margin Upper Fort Union Sandstone 50330101

Wasatch Formation 50330181

Upper Fort Union Formation 50330182

Lower Fort Union–Lance Formations 50330183
Graphical Data 3

Fall River–Lakota Sandstones 50330201

Muddy Sandstones 50330202

Mowry Continuous Oil 50330261

Frontier-Turner Sandstones 50330301

Sussex-Shannon Sandstones 50330302

Mesaverde-Lewis Sandstones 50330303

Niobrara Continuous Oil 50330361

Shallow Continuous Biogenic Gas 50330461

Minnelusa-Tensleep-Leo Sandstones 50330501

Basin Margin 50330601

The assessment-unit portion of the code (last two digits) defines the type of assessment unit. Numbers from 01 to 59 

represent conventional assessment units: 61 to 79 represent continuous oil or gas assessment units, and 81 to 99 represent coalbed-gas assessment units. No total petroleum system or assessment-unit codes end with 0, for example 503300, 

50330160 or 50330180.

To maintain the conventional labeling of files (8-character name and 3-character extension), some file names that contain assessment-unit numbers do not include the first two digits. For example, a summary table that contains input data for the 

Eastern Basin Margin Upper Fort Union Sandstone assessment unit is labeled “c330101.pdf.”

Summary Tables

The c######.pdf and u######.pdf files are copies of the completed input data forms used in the assessment process. 

The c######.pdf files contain the Seventh Approximation Data Forms for Conventional Assessment Units. The 

u######.pdf files contain the FORSPAN Assessment Model for Continuous Accumulations–Basic Input Data Form. These 

data are defined in the inf####.tab and ins####.tab sections of this report.

The d######.pdf files contain three tables of known and grown petroleum volumes in an assessment unit as a whole 

and in terms of discovery history. Grown field sizes are defined as known accumulation sizes that were adjusted upward to 

account for estimated future reserve growth. NA means not applicable and is shown in place of volumes for which only one 

field is present to protect the proprietary nature of the data.

Graphical Data

The fp######.pdf files contain graphs of input data and estimated petroleum resource volumes for continuous assessment units. The data are defined in the inf####.tab and vol####.tab sections of this report. The graphs contained in these files 

are derived from a report generated by a commercial software package. The quality of these preformatted graphs, therefore, 

does not necessarily meet USGS editorial standards.

The em######.pdf files contain graphs of input data and estimated petroleum resource volumes for conventional assessment units. The data are defined in the ins####.tab and vol####.tab sections of this report. The graphs contained in these files 

are derived from a report generated by a commercial software package. The quality of these preformatted graphs, therefore, 

does not necessarily meet USGS editorial standards.

The g######.pdf and k######.pdf files contain graphs of exploration and discovery data for conventional assessment 

units. The volumetric data are defined in the kvol####.tab sections of this report. To protect the proprietary nature of the data, 

these files are not provided if the total number of accumulations in the assessment unit that are greater than or equal to the 

specified minimum size is less than four.

Two sets of exploration-activity and discovery-history graphs are provided for each of the assessment units, one set 

showing known field sizes (cumulative production plus remaining reserves) and the other showing field sizes that were 

adjusted to compensate for potential reserve growth that may occur in the next 30 years (labeled “grown”). Within each set of 

graphs, oil fields and gas fields are treated separately. The graphs include:

• Cumulative Number of New-Field Wildcat Wells vs. Drilling-Completion Year

• Number of New-Field Wildcat Wells vs. Drilling-Completion Year

• Oil- or Gas-Accumulation Size (MMBO or BCFG) vs. Oil- or Gas-Accumulation Rank by Size (With Respect to 

Discovery Halves or Thirds)
4 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

• Number of Oil or Gas Accumulations vs. Oil- or Gas-Accumulation Size Classes (MMBO or BCFG) (With Respect to 

Discovery Halves or Thirds)

• Volume of Oil or Gas (MMBO or BCFG) vs. Oil- or Gas-Accumulation Size Classes (MMBO or BCFG)

• Oil- or Gas-Accumulation Size (MMBO or BCFG) vs. Accumulation-Discovery Year

• Oil- or Gas-Accumulation Size (MMBO or BCFG) vs. Cumulative Number of New-Field Wildcat Wells

• Cumulative Oil or Gas Volume (MMBO or BCFG) vs. Accumulation-Discovery Year

• Cumulative Oil or Gas Volume (MMBO or BCFG) vs. Cumulative Number of New-Field Wildcat Wells

• Cumulative Number of Oil or Gas Accumulations vs. Accumulation-Discovery Year

• Cumulative Number of Oil or Gas Accumulations vs. Cumulative Number of New-Field Wildcat Wells

• Reservoir Depth, Oil or Gas Accumulations (ft) vs. Accumulation-Discovery Year

• Reservoir Depth, Oil or Gas Accumulations (ft) vs. Cumulative Number of New-Field Wildcat Wells

• Gas/Oil, Oil Accumulations (CFG/BO) vs. Mean Reservoir Depth (ft)

• NGL/Gas, Oil Accumulations (BNGL/MMCFG) vs. Mean Reservoir Depth (ft)

• Liquids/Gas, Gas Accumulations (BL/MMCFG) vs. Mean Reservoir Depth (ft)

• Number of Reservoirs in Oil Accumulations vs. API Gravity (Degrees)

If data are insufficient or do not exist, graphs are not provided. Therefore, not all graphs are included in all files.

File List

Data tables

eco5033.tab

fed5033.tab

inf5033.tab

ins5033.tab

kvol5033.tab

own5033.tab

sta5033.tab

vol5033.tab

Summary tables Assessment-unit name

c330101.pdf Eastern Basin Margin Upper Fort Union Sandstone

c330201.pdf Fall River–Lakota Sandstones

c330202.pdf Muddy Sandstones

c330301.pdf Frontier-Turner Sandstones

c330302.pdf Sussex-Shannon Sandstones

c330303.pdf Mesaverde-Lewis Sandstones

c330501.pdf Minnelusa-Tensleep-Leo Sandstones

c330601.pdf Basin Margin

d330201.pdf Fall River–Lakota Sandstones

d330301.pdf Frontier-Turner Sandstones

d330302.pdf Sussex-Shannon Sandstones

d330303.pdf Mesaverde-Lewis Sandstones

d330501.pdf Minnelusa-Tensleep-Leo Sandstones

d330601.pdf Basin Margin

u330181.pdf Wasatch Formations

u330182.pdf Upper Fort Union Formation

u330183.pdf Lower Fort Union–Lance Formations
Tabular Data 5

u330261.pdf Mowry Continuous Oil

u330361.pdf Niobrara Continuous Oil

u330461.pdf Shallow Continuous Biogenic Gas

Graphs Assessment-unit name

em330101.pdf Eastern Basin Margin Upper Fort Union Sandstone

em330201.pdf Fall River–Lakota Sandstones

em330202.pdf Muddy Sandstones

em330301.pdf Frontier-Turner Sandstones

em330302.pdf Sussex-Shannon Sandstones

em330303.pdf Mesaverde-Lewis Sandstones

em330501.pdf Minnelusa-Tensleep-Leo Sandstones

em330601.pdf Basin Margin

fp330181.pdf Wasatch Formations

fp330182.pdf Upper Fort Union Formation

fp330183.pdf Lower Fort Union–Lance Formations

fp330261.pdf Mowry Continuous Oil

fp330361.pdf Niobrara Continuous Oil

fp330461.pdf Shallow Continuous Biogenic Gas

g330201.pdf Fall River–Lakota Sandstones

g330301.pdf Frontier-Turner Sandstones

g330302.pdf Sussex-Shannon Sandstones

g330303.pdf Mesaverde-Lewis Sandstones

g330501.pdf Minnelusa-Tensleep-Leo Sandstones

g330601.pdf Basin Margin

k330201.pdf Fall River–Lakota Sandstones

k330301.pdf Frontier-Turner Sandstones

k330302.pdf Sussex-Shannon Sandstones

k330303.pdf Mesaverde-Lewis Sandstones

k330501.pdf Minnelusa-Tensleep-Leo Sandstones

k330601.pdf Basin Margin

Tabular Data

The eco####.tab, fed####.tab, own####.tab, and sta####.tab files contain volume-percent data of undiscovered petroleum allocated to ecosystem regions, Federal lands, general land-ownership parcels, and States. Cells are left blank if data are 

unavailable.

The eco####.tab table contains 59 columns. The sum of the percentages should equal those for the total area (excluding 

offshore) in the own####.tab file. Data columns for these files are as follows:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Area km2—area of the assessment unit in square kilometers.

(4) Eco 1—name of first ecosystem that occupies all or part of the assessment-unit area.

(5) E1 Area %—percentage of assessment-unit area that is occupied by ecosystem 1.

(6) E1 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 1.

(7) E1 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 1.

(8) Eco 2—name of second ecosystem that occupies part of the assessment-unit area.

(9) E2 Area %—percentage of assessment-unit area that is occupied by ecosystem 2.

(10) E2 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 2.

(11) E2 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 2.

(12) Eco 3—name of third ecosystem that occupies part of the assessment-unit area.

(13) E3 Area %—percentage of assessment-unit area that is occupied by ecosystem 3.

(14) E3 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 3.

(15) E3 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 3.

(16) Eco 4—name of fourth ecosystem that occupies part of the assessment-unit area.

(17) E4 Area %—percentage of assessment-unit area that is occupied by ecosystem 4.

(18) E4 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 4.

(19) E4 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 4.
6 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(20) Eco 5—name of fifth ecosystem that occupies part of the assessment-unit area.

(21) E5 Area %—percentage of assessment-unit area that is occupied by ecosystem 5.

(22) E5 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 5.

(23) E5 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 5.

(24) Eco 6—name of sixth ecosystem that occupies part of the assessment-unit area.

(25) E6 Area %—percentage of assessment-unit area that is occupied by ecosystem 6.

(26) E6 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 6.

(27) E6 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 6.

(28) Eco 7—name of seventh ecosystem that occupies part of the assessment-unit area.

(29) E7 Area %— percentage of assessment-unit area that is occupied by ecosystem 7.

(30) E7 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 7.

(31) E7 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 7.

(32) Eco 8—name of eighth ecosystem that occupies part of the assessment-unit area.

(33) E8 Area %—percentage of assessment-unit area that is occupied by ecosystem 8.

(34) E8 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 8.

(35) E8 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 8.

(36) Eco 9—name of ninth ecosystem that occupies part of the assessment-unit area.

(37) E9 Area %—percentage of assessment-unit area that is occupied by ecosystem 9.

(38) E9 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 9.

(39) E9 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 9.

(40) Eco 10—name of tenth ecosystem that occupies part of the assessment-unit area.

(41) E10 Area %—percentage of assessment-unit area that is occupied by ecosystem 10.

(42) E10 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 10.

(43) E10 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 10.

(44) Eco 11—name of eleventh ecosystem that occupies part of the assessment-unit area.

(45) E11 Area %—percentage of assessment-unit area that is occupied by ecosystem 11.

(46) E11 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 11.

(47) E11 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 11.

(48) Eco 12—name of twelfth ecosystem that occupies part of the assessment-unit area.

(49) E12 Area %—percentage of assessment-unit area that is occupied by ecosystem 12.

(50) E12 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 12.

(51) E12 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 12.

(52) Eco 13—name of thirteenth ecosystem that occupies part of the assessment-unit area.

(53) E13 Area %—percentage of assessment-unit area that is occupied by ecosystem 13.

(54) E13 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 13.

(55) E13 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 13.

(56) Eco 14—name of fourteenth ecosystem that occupies part of the assessment-unit area.

(57) E14 Area %—percentage of assessment-unit area that is occupied by ecosystem 14.

(58) E14 Oil %—estimated percentage of undiscovered oil volume allocated to ecosystem 14.

(59) E14 Gas %—estimated percentage of undiscovered gas volume allocated to ecosystem 14.

The fed####.tab table contains 83 columns. The sum of the percentages should equal those for Federal lands in the 

own####.tab file. Data columns for these files are:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Area km2—area of the assessment unit in square kilometers.

(4) BLM—“Bureau of Land Management (BLM),” name of Federal land that occupies all or part of the 

assessment-unit area.

(5) BLM Area %—percentage of assessment-unit area that is occupied by Bureau of Land Management lands.

(6) BLM Oil %—estimated percentage of undiscovered oil volume allocated to Bureau of Land Management 

lands.

(7) BLM Gas %—estimated percentage of undiscovered gas volume allocated to Bureau of Land Management 

lands.

(8) BLMW—“BLM Wilderness Areas (BLMW),” name of Federal land that occupies all or part of the 

assessment-unit area.
Tabular Data 7

(9) BLMW Area %—percentage of assessment-unit area that is occupied by Bureau of Land Management 

Wilderness Areas.

(10) BLMW Oil %—estimated percentage of undiscovered oil volume allocated to Bureau of Land 

Management Wilderness Areas.

(11) BLMW Gas %—estimated percentage of undiscovered gas volume allocated to Bureau of Land 

Management Wilderness Areas.

(12) BLMR—“BLM Roadless Areas (BLMR),” name of Federal land that occupies all or part of the 

assessment-unit area.

(13) BLMR Area %—percentage of assessment-unit area that is occupied by Bureau of Land Management 

Roadless Areas.

(14) BLMR Oil %—estimated percentage of undiscovered oil volume allocated to Bureau of Land Management 

Roadless Areas.

(15) BLMR Gas %—estimated percentage of undiscovered gas volume allocated to Bureau of Land 

Management Roadless Areas.

(16) NPS—“National Park Service (NPS),” name of Federal land that occupies all or part of the assessment-unit 

area.

(17) NPS Area %—percentage of assessment-unit area that is occupied by National Park Service lands.

(18) NPS Oil %—estimated percentage of undiscovered oil volume allocated to National Park Service lands.

(19) NPS Gas %—estimated percentage of undiscovered gas volume allocated to National Park Service lands.

(20) NPSW—“NPS Wilderness Areas (NPSW),” name of Federal land that occupies all or part of the 

assessment-unit area.

(21) NPSW Area %—percentage of assessment-unit area that is occupied by National Park Service Wilderness 

Areas.

(22) NPSW Oil %—estimated percentage of undiscovered oil volume allocated to National Park Service 

Wilderness Areas.

(23) NPSW Gas %—estimated percentage of undiscovered gas volume allocated to National Park Service 

Wilderness Areas.

(24) NPSP—“NPS Withdrawals (NPSP),” name of Federal land that occupies all or part of the assessment-unit 

area.

(25) NPSP Area %—percentage of assessment-unit area that is occupied by National Park Service Withdrawals.

(26) NPSP Oil %—estimated percentage of undiscovered oil volume allocated to National Park Service 

Withdrawals.

(27) NPSP Gas %—estimated percentage of undiscovered gas volume allocated to National Park Service 

Withdrawals.

(28) FS—“Forest Service (FS),” name of Federal land that occupies all or part of the assessment-unit area.

(29) FS Area %—percentage of assessment-unit area that is occupied by USDA Forest Service lands.

(30) FS Oil %—estimated percentage of undiscovered oil volume allocated to USDA Forest Service lands.

(31) FS Gas %—estimated percentage of undiscovered gas volume allocated to USDA Forest Service lands.

(32) FSW—“FS Wilderness Areas (FSW),” name of Federal land that occupies all or part of the assessment-unit 

area.

(33) FSW Area %—percentage of assessment-unit area that is occupied by USDA Forest Service Wilderness 

Areas.

(34) FSW Oil %—estimated percentage of undiscovered oil volume allocated to USDA Forest Service 

Wilderness Areas.

(35) FSW Gas %—estimated percentage of undiscovered gas volume allocated to USDA Forest Service 

Wilderness Areas.

(36) FSR—“FS Roadless Areas (FSR),” name of Federal land that occupies all or part of the assessment-unit 

area.

(37) FSR Area %—percentage of assessment-unit area that is occupied by USDA Forest Service Roadless 

Areas.

(38) FSR Oil %—estimated percentage of undiscovered oil volume allocated to USDA Forest Service Roadless 

Areas.

(39) FSR Gas %—estimated percentage of undiscovered gas volume allocated to USDA Forest Service 

Roadless Areas.
8 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(40) FSP—“FS Protected Withdrawals (FSP),” name of Federal land that occupies all or part of the assessmentunit area.

(41) FSP Area %—percentage of assessment-unit area that is occupied by USDA Forest Service Protected 

Withdrawals.

(42) FSP Oil %—estimated percentage of undiscovered oil volume allocated to USDA Forest Service Protected 

Withdrawals.

(43) FSP Gas %—estimated percentage of undiscovered gas volume allocated to USDA Forest Service 

Protected Withdrawals.

(44) FWS—“U.S. Fish and Wildlife Service (USFWS),” name of Federal land that occupies all or part of the 

assessment-unit area.

(45) FWS Area %—percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service lands.

(46) FWS Oil %—estimated percentage of undiscovered oil volume allocated to U.S. Fish and Wildlife Service 

lands.

(47) FWS Gas %—estimated percentage of undiscovered gas volume allocated to U.S. Fish and Wildlife Service 

lands.

(48) FWSW—“USFWS Wilderness Areas (USFWSW),” name of Federal land that occupies all or part of the 

assessment-unit area.

(49) FWSW Area %—percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service 

Wilderness Areas.

(50) FWSW Oil %—estimated percentage of undiscovered oil volume allocated to U.S. Fish and Wildlife 

Service Wilderness Areas.

(51) FWSW Gas %—estimated percentage of undiscovered gas volume allocated to U.S. Fish and Wildlife 

Service Wilderness Areas.

(52) FWSP—“USFWS Protected Withdrawals (USFWSP),” name of Federal land that occupies all or part of the 

assessment-unit area.

(53) FWSP Area %—percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service 

Protected Withdrawals.

(54) FWSP Oil %—estimated percentage of undiscovered oil volume allocated to U.S. Fish and Wildlife Service 

Protected Withdrawals.

(55) FWSP Gas %—estimated percentage of undiscovered gas volume allocated to U.S. Fish and Wildlife 

Service Protected Withdrawals.

(56) WS—“Wilderness Study Areas (WS),” name of Federal land that occupies all or part of the assessment-unit 

area.

(57) WS Area %—percentage of assessment-unit area that is occupied by Wilderness Study Areas.

(58) WS Oil %—estimated percentage of undiscovered oil volume allocated to Wilderness Study Areas.

(59) WS Gas %—estimated percentage of undiscovered gas volume allocated to Wilderness Study Areas.

(60) DOE—“Department of Energy (DOE),” name of Federal land that occupies all or part of the assessmentunit area.

(61) DOE Area %—percentage of assessment-unit area that is occupied by Department of Energy lands.

(62) DOE Oil %—estimated percentage of undiscovered oil volume allocated to Department of Energy lands.

(63) DOE Gas %—estimated percentage of undiscovered gas volume allocated to Department of Energy lands.

(64) DOD—“Department of Defense (DOD),” name of Federal land that occupies all or part of the assessmentunit area.

(65) DOD Area %—percentage of assessment-unit area that is occupied by Department of Defense lands.

(66) DOD Oil %—estimated percentage of undiscovered oil volume allocated to Department of Defense lands.

(67) DOD Gas %—estimated percentage of undiscovered gas volume allocated to Department of Defense lands.

(68) BOR—“Bureau of Reclamation (BOR),” name of Federal land that occupies all or part of the assessmentunit area.

(69) BOR Area %—percentage of assessment-unit area that is occupied by Bureau of Reclamation lands.

(70) BOR Oil %—estimated percentage of undiscovered oil volume allocated to Bureau of Reclamation lands.

(71) BOR Gas %—estimated percentage of undiscovered gas volume allocated to Bureau of Reclamation lands.

(72) TVA—“Tennessee Valley Authority (TVA),” name of Federal land that occupies all or part of the 

assessment-unit area.

(73) TVA Area %—percentage of assessment-unit area that is occupied by Tennessee Valley Authority lands.

(74) TVA Oil %—estimated percentage of undiscovered oil volume allocated to Tennessee Valley Authority 

lands.
Tabular Data 9

(75) TVA Gas %—estimated percentage of undiscovered gas volume allocated to Tennessee Valley Authority 

lands.

(76) Other—“Other Federal,” other unspecified Federal lands that occupy all part of the assessment-unit area.

(77) Oth Area %—percentage of assessment-unit area that is occupied by other unspecified Federal lands.

(78) Oth Oil %—estimated percentage of undiscovered oil volume allocated to other unspecified Federal lands.

(79) Oth Gas %—estimated percentage of undiscovered gas volume allocated to other unspecified Federal lands.

(80) Fed 20—name of additional specified Federal lands that occupy all or part of the assessment-unit area.

(81) F20 Area %—percentage of assessment-unit area that is occupied by additional specified Federal lands.

(82) F20 Oil %—estimated percentage of undiscovered oil volume allocated to additional specified Federal 

lands.

(83) F20 Gas %—estimated percentage of undiscovered gas volume allocated to additional specified Federal 

lands.

The own####.tab table contains 59 columns. The sum of the percentages should equal 100. Data columns for these files 

are as follows:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Area km2—area of the assessment unit in square kilometers.

(4) Fed—“Federal Lands,” all Federal lands that occupy all or part of the assessment-unit area.

(5) Fed Area %—percentage of assessment-unit area that is occupied by Federal lands.

(6) Fed Oil %—estimated percentage of undiscovered oil volume allocated to Federal lands.

(7) Fed Gas %—estimated percentage of undiscovered gas volume allocated to Federal lands.

(8) Pri—“Private Lands,” all private lands that occupy all or part of the assessment-unit area.

(9) Pri Area %—percentage of assessment-unit area that is occupied by private lands.

(10) Pri Oil %—estimated percentage of undiscovered oil volume allocated to private lands.

(11) Pri Gas %—estimated percentage of undiscovered gas volume allocated to private lands.

(12) Tri—“Tribal Lands,” all tribal lands that occupy all or part of the assessment-unit area.

(13) Tri Area %—percentage of assessment-unit area that is occupied by tribal lands.

(14) Tri Oil %—estimated percentage of undiscovered oil volume allocated to tribal lands.

(15) Tri Gas %—estimated percentage of undiscovered gas volume allocated to tribal lands.

(16) Oth—name of other unspecified lands or offshore areas that occupy all or part of the assessment-unit area.

(17) Oth Area %—percentage of assessment-unit area that is occupied by other unspecified lands or offshore 

areas.

(18) Oth Oil %—estimated percentage of undiscovered oil volume allocated to other unspecified lands or 

offshore areas.

(19) Oth Gas %—estimated percentage of undiscovered gas volume allocated to other unspecified lands or 

offshore areas.

(20) State 1—name of first State for which State-owned lands or waters occupy all or part of the assessment-unit 

area.

(21) S1 Area %—percentage of assessment-unit area that is occupied by State 1-owned lands or waters.

(22) S1 Oil %—estimated percentage of undiscovered oil volume allocated to State 1-owned lands or waters.

(23) S1 Gas %—estimated percentage of undiscovered gas volume allocated to State 1-owned lands or waters.

(24) State 2—name of second State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(25) S2 Area %—percentage of assessment-unit area that is occupied by State 2-owned lands or waters.

(26) S2 Oil %—estimated percentage of undiscovered oil volume allocated to State 2-owned lands or waters.

(27) S2 Gas %—estimated percentage of undiscovered gas volume allocated to State 2-owned lands or waters.

(28) State 3—name of third State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(29) S3 Area %—percentage of assessment-unit area that is occupied by State 3-owned lands or waters.

(30) S3 Oil %—estimated percentage of undiscovered oil volume allocated to State 3-owned lands or waters.

(31) S3 Gas %—estimated percentage of undiscovered gas volume allocated to State 3-owned lands or waters.

(32) State 4—name of fourth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(33) S4 Area %—percentage of assessment-unit area that is occupied by State 4-owned lands or waters.

(34) S4 Oil %—estimated percentage of undiscovered oil volume allocated to State 4-owned lands or waters.
10 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(35) S4 Gas %—estimated percentage of undiscovered gas volume allocated to State 4-owned lands or waters.

(36) State 5—name of fifth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(37) S5 Area %—percentage of assessment-unit area that is occupied by State 5-owned lands or waters.

(38) S5 Oil %—estimated percentage of undiscovered oil volume allocated to State 5-owned lands or waters.

(39) S5 Gas %—estimated percentage of undiscovered gas volume allocated to State 5-owned lands or waters.

(40) State 6—name of sixth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(41) S6 Area %—percentage of assessment-unit area that is occupied by State 6-owned lands or waters.

(42) S6 Oil %—estimated percentage of undiscovered oil volume allocated to State 6-owned lands or waters.

(43) S6 Gas %—estimated percentage of undiscovered gas volume allocated to State 6-owned lands or waters.

(44) State 7—name of seventh State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(45) S7 Area %—percentage of assessment-unit area that is occupied by State 7-owned lands or waters.

(46) S7 Oil %—estimated percentage of undiscovered oil volume allocated to State 7-owned lands or waters.

(47) S7 Gas %—estimated percentage of undiscovered gas volume allocated to State 7-owned lands or waters.

(48) State 8—name of eighth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(49) S8 Area %—percentage of assessment-unit area that is occupied by State 8-owned lands or waters.

(50) S8 Oil %—estimated percentage of undiscovered oil volume allocated to State 8-owned lands or waters.

(51) S8 Gas %—estimated percentage of undiscovered gas volume allocated to State 8-owned lands or waters.

(52) State 9—name of ninth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(53) S9 Area %—percentage of assessment-unit area that is occupied by State 9-owned lands or waters.

(54) S9 Oil %—estimated percentage of undiscovered oil volume allocated to State 9-owned lands or waters.

(55) S9 Gas %—estimated percentage of undiscovered gas volume allocated to State 9-owned lands or waters.

(56) State 10—name of tenth State for which State-owned lands or waters occupy all or part of the assessmentunit area.

(57) S10 Area %—percentage of assessment-unit area that is occupied by State 10-owned lands or waters.

(58) S10 Oil %—estimated percentage of undiscovered oil volume allocated to State 10-owned lands or waters.

(59) S10 Gas %—estimated percentage of undiscovered gas volume allocated to State 10-owned lands or 

waters.

The sta####.tab table contains 59 columns. The sum of the percentages should equal 100. Data columns for these files 

are as follows:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Area km2—area of the assessment unit in square kilometers.

(4) State 1—name of first State (onshore and offshore) that occupies all or part of the assessment-unit area.

(5) S1 Area %—percentage of assessment-unit area that is occupied by State 1.

(6) S1 Oil %—estimated percentage of undiscovered oil volume allocated to State 1.

(7) S1 Gas %—estimated percentage of undiscovered gas volume allocated to State 1.

(8) State 2—name of second State (onshore and offshore) that occupies all or part of the assessment-unit area.

(9) S2 Area %—percentage of assessment-unit area that is occupied by State 2.

(10) S2 Oil %—estimated percentage of undiscovered oil volume allocated to State 2.

(11) S2 Gas %—estimated percentage of undiscovered gas volume allocated to State 2.

(12) State 3—name of third State (onshore and offshore) that occupies all or part of the assessment-unit area.

(13) S3 Area %—percentage of assessment-unit area that is occupied by State 3.

(14) S3 Oil %—estimated percentage of undiscovered oil volume allocated to State 3.

(15) S3 Gas %—estimated percentage of undiscovered gas volume allocated to State 3.

(16) State 4—name of fourth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(17) S4 Area %—percentage of assessment-unit area that is occupied by State 4.

(18) S4 Oil %—estimated percentage of undiscovered oil volume allocated to State 4.

(19) S4 Gas %—estimated percentage of undiscovered gas volume allocated to State 4.

(20) State 5—name of fifth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(21) S5 Area %—percentage of assessment-unit area that is occupied by State 5.
Tabular Data 11

(22) S5 Oil %—estimated percentage of undiscovered oil volume allocated to State 5.

(23) S5 Gas %—estimated percentage of undiscovered gas volume allocated to State 5.

(24) State 6—name of sixth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(25) S6 Area %—percentage of assessment-unit area that is occupied by State 6.

(26) S6 Oil %—estimated percentage of undiscovered oil volume allocated to State 6.

(27) S6 Gas %—estimated percentage of undiscovered gas volume allocated to State 6.

(28) State 7—name of seventh State (onshore and offshore) that occupies all or part of the assessment-unit area.

(29) S7 Area %—percentage of assessment-unit area that is occupied by State 7.

(30) S7 Oil %—estimated percentage of undiscovered oil volume allocated to State 7.

(31) S7 Gas %—estimated percentage of undiscovered gas volume allocated to State 7.

(32) State 8—name of eighth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(33) S8 Gas %—percentage of assessment-unit area that is occupied by State 8.

(34) S8 Oil %—estimated percentage of undiscovered oil volume allocated to State 8.

(35) S8 Gas %—estimated percentage of undiscovered gas volume allocated to State 8.

(36) State 9—name of ninth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(37) S9 Area %—percentage of assessment-unit area that is occupied by State 9.

(38) S9 Oil %—estimated percentage of undiscovered oil volume allocated to State 9.

(39) S9 Gas %—estimated percentage of undiscovered gas volume allocated to State 9.

(40) State 10—name of tenth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(41) S10 Area %—percentage of assessment-unit area that is occupied by State 10.

(42) S10 Oil %—estimated percentage of undiscovered oil volume allocated to State 10.

(43) S10 Gas %—estimated percentage of undiscovered gas volume allocated to State 10.

(44) State 11—name of eleventh State (onshore and offshore) that occupies all or part of the assessment-unit 

area.

(45) S11 Area %—percentage of assessment-unit area that is occupied by State 11.

(46) S11 Oil %—estimated percentage of undiscovered oil volume allocated to State 11.

(47) S11 Gas %—estimated percentage of undiscovered gas volume allocated to State 11.

(48) State 12—name of twelfth State (onshore and offshore) that occupies all or part of the assessment-unit area.

(49) S12 Area %—percentage of assessment-unit area that is occupied by State 12.

(50) S12 Oil %—estimated percentage of undiscovered oil volume allocated to State 12.

(51) S12 Gas %—estimated percentage of undiscovered gas volume allocated to State 12.

(52) State 13—name of thirteenth State (onshore and offshore) that occupies all or part of the assessment-unit 

area.

(53) S13 Area %—percentage of assessment-unit area that is occupied by State 13.

(54) S13 Oil %—estimated percentage of undiscovered oil volume allocated to State 13.

(55) S13 Gas %—estimated percentage of undiscovered gas volume allocated to State 13.

(56) State 14—name of fourteenth State (onshore and offshore) that occupies all or part of the assessment-unit 

area.

(57) S14 Area %—percentage of assessment-unit area that is occupied by State 14.

(58) S14 Oil %—estimated percentage of undiscovered oil volume allocated to State 14.

(59) S14 Gas %—estimated percentage of undiscovered gas volume allocated to State 14.

The vol####.tab table contains estimates of undiscovered petroleum resources along with parameters that express 

uncertainty in these estimates. The table contains 40 columns. Blank cells represent no data. Data columns for these files are 

as follows:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Type—type of assessment unit, conventional, continuous oil, continuous gas, or coalbed gas.

(4) Status—remarks indicating that assessment unit was not quantitatively assessed; otherwise blank.

(5) Prob %—geologic probability of the assessment unit.

(6) OILF95 MMB—the estimated value of undiscovered oil (oil in oil accumulations) such that there is a 

95-percent probability that this amount or more exists in the assessment unit. The volume is given in 

millions of barrels of oil (MMBO).

(7) OILF50 MMB—the estimated value of undiscovered oil (oil in oil accumulations) such that there is a 

50-percent probability that this amount or more exists in the assessment unit. This is the median value. The 

volume is given in millions of barrels of oil (MMBO).
12 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(8) OILF5 MMB—the estimated value of undiscovered oil (oil in oil accumulations) such that there is a 

5-percent probability that this amount or more exists in the assessment unit. The volume is given in 

millions of barrels of oil (MMBO).

(9) OILMN MMB—the estimated mean (average) value of undiscovered oil (oil in oil accumulations). The 

volume is given in millions of barrels of oil (MMBO).

(10) OILSD MMB—the estimated standard deviation value of undiscovered oil (oil in oil accumulations). The 

volume is given in millions of barrels of oil (MMBO).

(11) AGF95 BCF—the estimated value of undiscovered associated/dissolved gas (gas in oil accumulations) 

such that there is a 95-percent probability that this amount or more exists in the assessment unit. The 

volume is given in billions of cubic feet of gas (BCFG).

(12) AGF50 BCF—the estimated value of undiscovered associated/dissolved gas (gas in oil accumulations) 

such that there is a 50-percent probability that this amount or more exists in the assessment unit. This is the 

median value. The volume is given in billions of cubic feet of gas (BCFG).

(13) AGF5 BCF—the estimated value of undiscovered associated/dissolved gas (gas in oil accumulations) such 

that there is a 5-percent probability that this amount or more exists in the assessment unit. The volume is 

given in billions of cubic feet of gas (BCFG).

(14) AGMN BCF—the estimated mean (average) value of undiscovered associated/dissolved gas (gas in oil 

accumulations). The volume is given in billions of cubic feet of gas (BCFG).

(15) AGSD BCF—the estimated standard deviation value of undiscovered associated/dissolved gas (gas in oil 

accumulations). The volume is given in billions of cubic feet of gas (BCFG).

(16) NGLF95 MMB—the estimated value of undiscovered natural gas liquids (NGL in oil accumulations) such 

that there is a 95-percent probability that this amount or more exists in the assessment unit. The volume is 

given in millions of barrels of NGL (MMBNGL).

(17) NGLF50 MMB—the estimated value of undiscovered natural gas liquids (NGL in oil accumulations) such 

that there is a 50-percent probability that this amount or more exists in the assessment unit. This is the 

median value. The volume is given in millions of barrels of NGL (MMBNGL).

(18) NGLF5 MMB—the estimated value of undiscovered natural gas liquids (NGL in oil accumulations) such 

that there is a 5-percent probability that this amount or more exists in the assessment unit. The volume is 

given in millions of barrels of NGL (MMBNGL).

(19) NGLMN MMB—the estimated mean (average) value of undiscovered natural gas liquids (NGL in oil 

accumulations). The volume is given in millions of barrels of NGL (MMBNGL).

(20) NGLSD MMB—the estimated standard deviation value of undiscovered natural gas liquids (NGL in oil 

accumulations). The volume is given in millions of barrels of NGL (MMBNGL).

(21) NGF95 BCF—the estimated value of undiscovered nonassociated gas (gas in gas accumulations) such that 

there is a 95-percent probability that this amount or more exists in the assessment unit. The volume is given 

in billions of cubic feet of gas (BCFG).

(22) NGF50 BCF—the estimated value of undiscovered nonassociated gas (gas in gas accumulations) such that 

there is a 50-percent probability that this amount or more exists in the assessment unit. This is the median 

value. The volume is given in billions of cubic feet of gas (BCFG).

(23) NGF5 BCF—the estimated value of undiscovered nonassociated gas (gas in gas accumulations) such that 

there is a 5-percent probability that this amount or more exists in the assessment unit. The volume is given 

in billions of cubic feet of gas (BCFG).

(24) NGMN BCF—the estimated mean (average) value of undiscovered nonassociated gas (gas in gas 

accumulations). The volume is given in billions of cubic feet of gas (BCFG).

(25) NGSD BCF—the estimated standard deviation value of undiscovered nonassociated gas (gas in gas 

accumulations). The volume is given in billions of cubic feet of gas (BCFG).

(26) LIQF95 MMB—the estimated value of undiscovered liquids (oil and NGL in gas accumulations) such that 

there is a 95-percent probability that this amount or more exists in the assessment unit. The volume is given 

in millions of barrels of liquids (MMBL).

(27) LIQF50 MMB—the estimated value of undiscovered liquids (oil and NGL in gas accumulations) such that 

there is a 50-percent probability that this amount or more exists in the assessment unit. This is the median 

value. The volume is given in millions of barrels of liquids (MMBL).

(28) LIQF5 MMB—the estimated value of undiscovered liquids (oil and NGL in gas accumulations) such that 

there is a 5-percent probability that this amount or more exists in the assessment unit. The volume is given 

in millions of barrels of liquids (MMBL).
Tabular Data 13

(29) LIQMN MMB—the estimated mean (average) value of undiscovered liquids (oil and NGL in gas 

accumulations). The volume is given in millions of barrels of liquids (MMBL).

(30) LIQSD MMB—the estimated standard deviation value of undiscovered liquids (oil and NGL in gas 

accumulations). The volume is given in millions of barrels of liquids (MMBL).

(31) LOF95 MMB—the estimated size of the largest undiscovered conventional oil accumulation such that 

there is a 95-percent probability of that accumulation being this amount or larger. The volume is given in 

millions of barrels of oil (MMBO).

(32) LOF50 MMB—the estimated size of the largest undiscovered conventional oil accumulation such that 

there is a 50-percent probability of that accumulation being this amount or larger. This is the median value. 

The volume is given in millions of barrels of oil (MMBO).

(33) LOF5 MMB—the estimated size of the largest undiscovered conventional oil accumulation such that there 

is a 5-percent probability of that accumulation being this amount or larger. The volume is given in millions 

of barrels of oil (MMBO).

(34) LOMN MMB—the estimated mean (average) value of the largest undiscovered conventional oil 

accumulation. The volume is given in millions of barrels of oil (MMBO).

(35) LOSD MMB—the estimated standard deviation value of the largest undiscovered conventional oil 

accumulation. The volume is given in millions of barrels of oil (MMBO).

(36) LGF95 BCF—the estimated size of the largest undiscovered conventional gas accumulation such that there 

is a 95-percent probability of that accumulation being this amount or larger. The volume is given in billions 

of cubic feet of gas (BCFG).

(37) LGF50 BCF—the estimated size of the largest undiscovered conventional gas accumulation such that there 

is a 50-percent probability of that accumulation being this amount or larger. This is the median value. The 

volume is given in billions of cubic feet of gas (BCFG).

(38) LGF5 BCF—the estimated size of the largest undiscovered conventional gas accumulation such that there 

is a 5-percent probability of that accumulation being this amount or larger. The volume is given in billions 

of cubic feet of gas (BCFG).

(39) LGMN BCF—the estimated mean (average) value of the largest undiscovered conventional gas 

accumulation. The volume is given in billions of cubic feet of gas (BCFG).

(40) LGSD BCF—the estimated standard deviation value of the largest undiscovered conventional gas 

accumulation. The volume is given in billions of cubic feet of gas (BCFG).

The inf####.tab table contains input data from the FORSPAN Assessment Model for Continuous Accumulations—Basic 

Input Data Form used in this assessment. Blank cells represent no data. This table contains 80 columns. Data columns are as 

follows:

(1) Date—date of assessment.

(2) Geol—assessing geologist’s name.

(3) Regno—region code number.

(4) Reg—region name.

(5) Provno—province code number.

(6) Prov—province name.

(7) TPSno—total petroleum system code number.

(8) TPS—total petroleum system name.

(9) AUno—assessment-unit code number.

(10) AU—assessment-unit name.

(11) Data—data sources used to aid in completing the data-input form.

(12) Comm—assessment unit type, the primary commodity type in the assessment unit, based on the gas-to-oil 

ratio (GOR) of the petroleum endowment, which includes both the discovered and undiscovered petroleum. 

An assessment unit is characterized as being oil prone if the gas-to-oil ratio (GOR) is less than 20,000 

cubic feet of gas per barrel of oil; otherwise, it is gas prone.

(13) RminMMBBCF—minimum total recovery per cell considered for assessment, in million barrels of oil 

(MMBO) for oil assessment units or billion cubic feet of gas (BCFG) for gas assessment units.

(14) Numtest1—number of tested cells in the assessment unit.

(15) Numtest2—number of tested cells in the assessment unit that have total recoveries equal to or larger than 

the specified minimum total recovery per cell.
14 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(16) AUM—assessment-unit maturity, the exploration maturity of the assessment unit. Assessment-unit maturity 

is classified as “established” if more than 24 cells exceed the minimum total recovery, “frontier” if 1 to 24 

cells exceed the minimum total recovery, or “hypothetical” if no cells exceed the minimum total recovery.

(17) Med1MMBBCF—median total recovery per cell of the set of tested cells equal to or greater than the 

minimum total recovery that constitute the first third of the total number of cells ranked according to date 

of discovery within the assessment unit, in million barrels of oil (MMBO) for oil assessment units or 

billion cubic feet of gas (BCFG) for gas assessment units.

(18) Med2MMBBCF—median total recovery per cell of the set of tested cells equal to or greater than the 

minimum total recovery that constitute the second third of the total number of cells ranked according to 

date of discovery within the assessment unit, in million barrels of oil (MMBO) for oil assessment units or 

billion cubic feet of gas (BCFG) for gas assessment units.

(19) Med3MMBBCF—median total recovery per cell of the set of tested cells equal to or greater than the 

minimum total recovery that constitute the third third of the total number of cells ranked according to 

date of discovery within the assessment unit, in million barrels of oil (MMBO) for oil assessment units or 

billion cubic feet of gas (BCFG) for gas assessment units.

(20) Prob1 %—charge probability, the probability for adequate petroleum charge for at least one untested cell 

equal to or larger than the minimum total recovery, somewhere in the assessment unit, having the potential 

to be added to reserves. Charge probability is given as a fractional value from 0 to 1.0.

(21) Prob2 %—rocks probability, the probability for adequate reservoirs, traps, and seals for at least one 

untested cell equal to or larger than the minimum total recovery, somewhere in the assessment unit, having 

the potential to be added to reserves. Rocks probability is given as a fractional value from 0 to 1.0.

(22) Prob3 %—timing probability, the probability for favorable geologic timing for at least one untested cell 

equal to or larger than the minimum total recovery, somewhere in the assessment unit, having the potential 

to be added to reserves. Timing probability is given as a fractional value from 0 to 1.0.

(23) Geoprob %—geologic probability, the product of charge, rocks, and timing probabilities. Geologic 

probability is given as a fractional value from 0 to 1.0.

(24) Prob4 %—accessibility probability, the probability for adequate location for necessary petroleumrelated activities to discover at least one untested cell equal to or larger than the minimum total recovery, 

somewhere in the assessment unit, having the potential to be added to reserves. Accessibility probability is 

given as a fractional value from 0 to 1.0.

(25) TAAmin a—minimum total assessment-unit area, the estimated minimum (F100) area of the assessment 

unit. The area is given in acres.

(26) TAAmed a—median total assessment-unit area, the estimated median (F50) area of the assessment unit. 

The area is given in acres.

(27) TAAmax a—maximum total assessment-unit area, the estimated maximum (F0) area of the assessment 

unit. The area is given in acres.

(28) CAmin a—minimum area per cell of untested cells with potential, the estimated minimum (F100) area 

per cell of untested cells having the potential for additions to reserves in the assessment unit. This area is 

equivalent to the drainage area of wells. This area is given in acres.

(29) CAmed a—median area per cell of untested cells with potential, the estimated median (F50) area per cell of 

untested cells having the potential for additions to reserves in the assessment unit. This area is equivalent to 

the drainage area of wells. This area is given in acres.

(30) CAmax a—maximum area per cell of untested cells with potential, the estimated maximum (F0) area 

per cell of untested cells having the potential for additions to reserves in the assessment unit. This area is 

equivalent to the drainage area of wells. This area is given in acres.

(31) TAAUmin %—estimated minimum (F100) percentage of the total assessment-unit area that is untested.

(32) TAAUmed %—estimated median (F50) percentage of the total assessment-unit area that is untested.

(33) TAAUmax %—estimated maximum (F0) percentage of the total assessment-unit area that is untested.

(34) UAAPmin %—estimated minimum (F100) percentage of the untested area in the assessment unit having 

the potential for additions to reserves).

(35) UAAPmed %—estimated median (F50) percentage of the untested area in the assessment unit having the 

potential for additions to reserves.

(36) UAAPmax %—estimated maximum (F0) percentage of the untested area in the assessment unit having the 

potential for additions to reserves.
Tabular Data 15

(37) RminMMBBCF—estimated minimum (F100) total recovery per cell for untested cells in the assessment 

unit having the potential for additions to reserves. This volume is given as million barrels of oil (MMBO) 

for oil assessment units and billion cubic feet of gas (BCFG) for gas assessment units.

(38) RmedMMBBCF—estimated median (F50) total recovery per cell for untested cells in the assessment unit 

having the potential for additions to reserves. This volume is given as million barrels of oil (MMBO) for oil 

assessment units and billion cubic feet of gas (BCFG) for gas assessment units.

(39) RmaxMMBBCF—estimated maximum (F0) total recovery per cell for untested cells in the assessment unit 

having the potential for additions to reserves. This volume is given as million barrels of oil (MMBO) for oil 

assessment units and billion cubic feet of gas (BCFG) for gas assessment units.

(40) GminCF/B—estimated minimum (F100) gas to oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/

BO), of untested cells equal to or larger than the minimum total recovery in oil assessment units.

(41) GmedCF/B—estimated median (F50) gas to oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/

BO), of untested cells equal to or larger than the minimum total recovery in oil assessment units.

(42) GmaxCF/B—estimated maximum (F0) gas to oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/

BO), of untested cells equal to or larger than the minimum total recovery in oil assessment units.

(43) NminB/MMCF—estimated minimum (F100) natural gas liquids (NGL) to gas ratio, in barrels of natural 

gas liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than the 

minimum total recovery in oil assessment units.

(44) NmedB/MMCF—estimated median (F50) natural gas liquids (NGL) to gas ratio, in barrels of natural 

gas liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than the 

minimum total recovery in oil assessment units.

(45) NmaxB/MMCF—estimated maximum (F0) natural gas liquids (NGL) to gas ratio, in barrels of natural 

gas liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than the 

minimum total recovery in oil assessment units.

(46) LminB/MMCF—estimated minimum (F100) liquids (oil plus natural gas liquids) to gas ratio (LGR), in 

barrels of liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than 

the minimum total recovery in gas assessment units.

(47) LmedB/MMCF—estimated median (F50) liquids (oil plus natural gas liquids) to gas ratio (LGR), in barrels 

of liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than the 

minimum total recovery in gas assessment units.

(48) LmaxB/MMCF—estimated maximum (F0) liquids (oil plus natural gas liquids) to gas ratio (LGR), in 

barrels of liquids per million cubic feet of gas (BNGL/MMCFG), of untested cells equal to or larger than 

the minimum total recovery in gas assessment units.

(49) APImin deg—estimated minimum (F100) API gravity, in degrees, of oil in untested cells in oil assessment 

units.

(50) APImed deg—estimated median (F50) API gravity, in degrees, of oil in untested cells in oil assessment 

units.

(51) APImax deg—estimated maximum (F0) API gravity, in degrees, of oil in untested cells in oil assessment 

units.

(52) Smin %—estimated minimum (F100) sulfur content, in percent, of oil in untested cells in oil assessment 

units.

(53) Smed %—estimated median (F50) sulfur content, in percent, of oil in untested cells in oil assessment units.

(54) Smax %—estimated maximum (F0) sulfur content, in percent, of oil in untested cells in oil assessment 

units.

(55) ODmin m—estimated minimum (F100) drilling depth, in meters, of oil in untested cells in oil assessment 

units.

(56) ODmed m—estimated median (F50) drilling depth, in meters, of oil in untested cells in oil assessment 

units.

(57) ODmax m—estimated maximum (F0) drilling depth, in meters, of oil in untested cells in oil assessment 

units.

(58) OWDmin m—estimated minimum (F100) water depth, in meters, of oil in untested cells in oil assessment 

units (ocean, bays, or lakes; if applicable).

(59) OWDmed m—estimated median (F50) water depth, in meters, of oil in untested cells in oil assessment 

units (ocean, bays, or lakes; if applicable).
16 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(60) OWDmax m—estimated maximum (F0) water depth, in meters, of oil in untested cells in oil assessment 

units (ocean, bays, or lakes; if applicable).

(61) IGmin %—estimated minimum (F100) inert gas content, in percent, of gas in untested cells in gas 

assessment units (nitrogen and helium, and so forth).

(62) IGmed %—estimated median (F50) inert gas content, in percent, of gas in untested cells in gas assessment 

units (nitrogen and helium, and so forth).

(63) IGmax %—estimated maximum (F0) inert gas content, in percent, of gas in untested cells in gas 

assessment units (nitrogen and helium, and so forth).

(64) CO2min %—estimated minimum (F100) carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(65) CO2med %—estimated median (F50) carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(66) CO2max %—estimated maximum (F0) carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(67) H2Smin %—estimated minimum (F100) hydrogen sulfide content, in percent, of gas in untested cells in 

gas assessment units.

(68) H2Smed %—estimated median (F50) hydrogen sulfide content, in percent, of gas in untested cells in gas 

assessment units.

(69) H2Smax %—estimated maximum (F0) hydrogen sulfide content, in percent, of gas in untested cells in gas 

assessment units.

(70) GDmin m—estimated minimum (F100) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(71) GDmed m—estimated median (F50) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(72) GDmax m—estimated maximum (F0) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(73) GWDmin m—estimated minimum (F100) water depth, in meters, of gas in untested cells in gas assessment 

units (ocean, bays, or lakes; if applicable)(74) GWDmed m—estimated median (F50) water depth, 

in meters, of gas in untested cells in gas assessment units (ocean, bays, or lakes; if applicable).

(75) GWDmax m—estimated maximum (F0) water depth, in meters, of gas in untested cells in gas assessment 

units (ocean, bays, or lakes; if applicable).

(76) FSRmean %—estimated mean future success ratio, as percent.

(77) FSRmin %—estimated minimum (F100) future success ratio, as percent.

(78) FSRmed %—estimated median (F50) future success ratio, as percent.

(79) FSRmax %—estimated maximum (F100) future success ratio, as percent.

(80) HSR %—historical success ratio, as percent.

The ins####.tab table contains input data from the Seventh Approximation Data Forms for Conventional Assessment 

Units used in this assessment and provided in the c######.pdf files. Cells are left blank if data are unavailable. This table 

contains 78 columns. Data columns are as follows:

(1) Date—date of assessment.

(2) Geol—assessing geologist’s name.

(3) Regno—region code number.

(4) Reg—region name.

(5) Provno—province code number.

(6) Prov—province name.

(7) TPSno—total petroleum system code number.

(8) TPS—total petroleum system name.

(9) AUno—assessment-unit code number.

(10) AU—assessment-unit name.

(11) Data—data sources used to aid in completing the data-input form.

(12) Comm—primary commodity type in the assessment unit, based on the gas-to-oil ratio of the petroleum 

endowment, which includes both the discovered and undiscovered petroleum. An assessment unit is 

characterized as being oil prone if the gas-to-oil ratio is less than 20,000 cubic feet of gas per barrel of oil; 

otherwise, it is gas prone.
Tabular Data 17

(13) Minsize MMB—minimum accumulation size considered for assessment, in million barrels of oil equivalent 

(MMBOE).

(14) Numoil—number of oil accumulations equal to or larger than the minimum accumulation size discovered 

in the assessment unit.

(15) Numgas—number of gas accumulations equal to or larger than the minimum accumulation size discovered 

in the assessment unit.

(16) AUM—assessment-unit maturity, the exploration maturity of the assessment unit. Assessment-unit maturity 

is classified as “established” if more than 13 accumulations exceeding minimum size have been discovered, 

“frontier” if 1 to 13 accumulations exceeding minimum size have been discovered, or “hypothetical” if no 

accumulations exceeding minimum size have been discovered.

(17) MedO1MMB—median size of the set of discovered oil accumulations that constitute the first one-third 

or one-half of the total number of oil accumulations ranked according to date of discovery within the 

assessment unit, in million barrels of oil (MMBO). This size is derived from known oil volumes that were 

adjusted upward to account for estimated future reserve growth.

(18) MedO2MMB—median size of the set of discovered oil accumulations that constitute the second onethird or one-half of the total number of oil accumulations ranked according to date of discovery within the 

assessment unit, in million barrels of oil (MMBO). This size is derived from known oil volumes that were 

adjusted upward to account for estimated future reserve growth.

(19) MedO3MMB—median size of the set of discovered oil accumulations that constitute the third one-third of 

the total number of oil accumulations ranked according to date of discovery within the assessment unit, in 

million barrels of oil (MMBO). This size is derived from known oil volumes that were adjusted upward to 

account for estimated future reserve growth.

(20) MedG1BCF—median size of the set of discovered gas accumulations that constitute the first one-third 

or one-half of the total number of gas accumulations ranked according to date of discovery within the 

assessment unit, in billion cubic feet of gas (BCFG). This size is derived from known gas volumes that 

were adjusted upward to account for estimated future reserve growth.

(21) MedG2BCF—median size of the set of discovered gas accumulations that constitute the second one-third 

or one-half of the total number of gas accumulations ranked according to date of discovery within the 

assessment unit, in billion cubic feet of gas (BCFG). This size is derived from known gas volumes that 

were adjusted upward to account for estimated future reserve growth.

(22) MedG3BCF—median size of the set of discovered gas accumulations that constitute the third one-third of 

the total number of gas accumulations ranked according to date of discovery within the assessment unit, in 

billion cubic feet of gas (BCFG). This size is derived from known gas volumes that were adjusted upward 

to account for estimated future reserve growth.

(23) Prob1 %—charge probability, the probability for adequate petroleum charge for at least one undiscovered 

accumulation equal to or larger than the minimum accumulation size, somewhere in the assessment unit, 

having the potential to be added to reserves. Charge probability is given as a fractional value from 0 to 1.0.

(24) Prob2 %—rocks probability, the probability for adequate reservoirs, traps, and seals for at least one 

undiscovered accumulation equal to or larger than the minimum accumulation size, somewhere in the 

assessment unit, having the potential to be added to reserves. Rocks probability is given as a fractional 

value from 0 to 1.0.

(25) Prob3 %—timing probability, the probability for favorable geologic timing for at least one undiscovered 

accumulation equal to or larger than the minimum accumulation size, somewhere in the assessment unit, 

having the potential to be added to reserves. Timing probability is given as a fractional value from 0 to 1.0.

(26) Geoprob %—geologic probability, the product of charge, rocks, and timing probabilities. Geologic 

probability is given as a fractional value from 0 to 1.0.

(27) NOmin—estimated minimum (F100) number of undiscovered oil accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.

(28) NOmod—estimated mode of number of undiscovered oil accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.

(29) NOmax—estimated maximum (F0) number of undiscovered oil accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.

(30) NGmin—estimated minimum (F100) number of undiscovered gas accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.

(31) NGmod—estimated mode of number of undiscovered gas accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.
18 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(32) NGmax—estimated maximum (F0) number of undiscovered gas accumulations equal to or larger than the 

minimum accumulation size in the assessment unit.

(33) SOminMMB—estimated minimum (F100) size, in million barrels of oil (MMBO), of undiscovered oil 

accumulations in the assessment unit.

(34) SOmedMMB—estimated median (F50) size, in million barrels of oil (MMBO), of undiscovered oil 

accumulations in the assessment unit.

(35) SOmaxMMB—estimated maximum (F0) size, in million barrels of oil (MMBO), of undiscovered oil 

accumulations in the assessment unit.

(36) SGminBCF—estimated minimum (F100) size, in billion cubic feet of gas (BCFG), of undiscovered gas 

accumulations in the assessment unit.

(37) SGmedBCF—estimated median (F50) size, in billion cubic feet of gas (BCFG), of undiscovered gas 

accumulations in the assessment unit.

(38) SGmaxBCF—estimated maximum (F0) size, in billion cubic feet of gas (BCFG), of undiscovered gas 

accumulations in the assessment unit.

(39) GminCF/B—estimated minimum (F100) gas-to-oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/

BO), of undiscovered oil accumulations equal to or larger than the minimum accumulation size in the 

assessment unit.

(40) GmodCF/B—estimated mode of gas-to-oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/BO), of 

undiscovered oil accumulations equal to or larger than the minimum accumulation size in the assessment 

unit.

(41) GmaxCF/B—estimated maximum (F0) gas-to-oil ratio (GOR), in cubic feet of gas per barrel of oil (CFG/

BO), of undiscovered oil accumulations equal to or larger than the minimum accumulation size in the 

assessment unit.

(42) NminB/MMCF—estimated minimum (F100) natural gas liquids (NGL) to gas ratio, in barrels of natural 

gas liquids per million cubic feet of gas (BNGL/MMCFG), of undiscovered oil accumulations equal to or 

larger than the minimum accumulation size in the assessment unit.

(43) NmodB/MMCF—estimated mode of natural gas liquids (NGL) to gas ratio, in barrels of natural gas liquids 

per million cubic feet of gas (BNGL/MMCFG), of undiscovered oil accumulations equal to or larger than 

the minimum accumulation size in the assessment unit.

(44) NmaxB/MMCF—estimated maximum (F0) natural gas liquids (NGL) to gas ratio, in barrels of natural 

gas liquids per million cubic feet of gas (BNGL/MMCFG), of undiscovered oil accumulations equal to or 

larger than the minimum accumulation size in the assessment unit.

(45) LminB/MMCF—estimated minimum (F100) liquids (oil plus natural gas liquids) to gas ratio (LGR), in 

barrels of liquids per million cubic feet of gas (BL/MMCFG), of undiscovered gas accumulations equal to 

or larger than the minimum accumulation size in the assessment unit.

(46) LmodB/MMCF—estimated mode of liquids (oil plus natural gas liquids) to gas ratio (LGR), in barrels of 

liquids per million cubic feet of gas (BL/MMCFG), of undiscovered gas accumulations equal to or larger 

than the minimum accumulation size in the assessment unit.

(47) LmaxB/MMCF—estimated maximum (F0) liquids (oil plus natural gas liquids) to gas ratio (LGR), in 

barrels of liquids per million cubic feet of gas (BL/MMCFG), of undiscovered gas accumulations equal to 

or larger than the minimum accumulation size in the assessment unit.

(48) APImin deg—estimated minimum (F100) API gravity, in degrees, of oil in undiscovered oil accumulations 

in the assessment unit.

(49) APImod deg—estimated mode of API gravity, in degrees, of oil in undiscovered oil accumulations in the 

assessment unit.

(50) APImax deg—estimated maximum (F0) API gravity, in degrees, of oil in undiscovered oil accumulations 

in the assessment unit.

(51) Smin %—estimated minimum (F100) sulfur content, in percent, of oil in undiscovered oil accumulations in 

the assessment unit.

(52) Smod %—estimated mode of sulfur content, in percent, of oil in undiscovered oil accumulations in the 

assessment unit.

(53) Smax %—estimated maximum (F0) sulfur content, in percent, of oil in undiscovered oil accumulations in 

the assessment unit.

(54) ODmin m—estimated minimum (F100) drilling depth, in meters, of oil in untested cells in oil assessment 

units.
Tabular Data 19

(55) ODf75 m—estimated 75th fractile (F75) of drilling depth, in meters, of oil in untested cells in oil 

assessment units.

(56) ODmod m—estimated mode of drilling depth, in meters, of oil in untested cells in oil assessment units.

(57) ODf25 m—estimated 25th fractile (F25) drilling depth, in meters, of oil in untested cells in oil assessment 

units.

(58) ODmax m—estimated maximum (F0) drilling depth, in meters, of oil in untested cells in oil assessment 

units.

(59) OWDmin m—estimated minimum (F100) water depth, in meters, of oil in untested cells in oil assessment 

units (ocean, bays, or lakes; if applicable).

(60) OWDmod m—estimated mode of water depth, in meters, of oil in untested cells in oil assessment units 

(ocean, bays, or lakes; if applicable).

(61) OWDmax m—estimated maximum (F0) water depth, in meters, of oil in untested cells in oil assessment 

units (ocean, bays, or lakes; if applicable).

(62) IGmin %—estimated minimum (F100) inert gas content, in percent, of gas in untested cells in gas 

assessment units (nitrogen and helium, and so forth).

(63) IGmod %—estimated mode of inert gas content, in percent, of gas in untested cells in gas assessment units 

(nitrogen and helium, and so forth).

(64) IGmax %—estimated maximum (F0) inert gas content, in percent, of gas in untested cells in gas 

assessment units (nitrogen and helium, and so forth).

(65) CO2min %—estimated minimum (F100) carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(66) CO2mod %—estimated mode of carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(67) CO2max %—estimated maximum (F0) carbon dioxide content, in percent, of gas in untested cells in gas 

assessment units.

(68) H2Smin %—estimated minimum (F100) hydrogen sulfide content, in percent, of gas in untested cells in 

gas assessment units.

(69) H2Smod %—estimated mode of hydrogen sulfide content, in percent, of gas in untested cells in gas 

assessment units.

(70) H2Smax %—estimated maximum (F0) hydrogen sulfide content, in percent, of gas in untested cells in gas 

assessment units.

(71) GDmin m—estimated minimum (F100) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(72) GDf25 m—estimated 25th fractile (F25) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(73) GDmod m—estimated mode of drilling depth, in meters, of gas in untested cells in gas assessment units.

(74) GDf25 m—estimated 25th fractile (F25) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(75) GDmax m—estimated maximum (F0) drilling depth, in meters, of gas in untested cells in gas assessment 

units.

(76) GWDmin m—estimated minimum (F100) water depth, in meters, of gas in untested cells in gas assessment 

units (ocean, bays, or lakes; if applicable).

(77) GWDmod m—estimated mode of water depth, in meters, of gas in untested cells in gas assessment units 

(ocean, bays, or lakes; if applicable).

(78) GWDmax m—estimated maximum (F0) water depth, in meters, of gas in untested cells in gas assessment 

units (ocean, bays, or lakes; if applicable).

Data in the kvol####.tab table are derived from a commercially purchased database (NRG Associates, 2002) and 

are current through 2000. This table contains 15 columns. Blank cells represent no data. Data columns for these files are as 

follows:

(1) Code—assessment-unit code number.

(2) Name—assessment-unit name.

(3) Numres—number of reported reservoirs in the assessment unit.

(4) CUMOIL MMB—cumulative production of oil from the reported reservoirs in the assessment unit. This 

volume is in million barrels of oil (MMBO).

(5) REMOIL MMB—remaining oil reserves in the reported reservoirs in the assessment unit. This volume is in 

million barrels of oil (MMBO).
20 Tabular Data and Graphical Images of the USGS Survey National Oil and Gas Assessment—Powder River Basin 

(6) KROIL MMB—known recoverable oil volume (cumulative production plus remaining reserves) from the 

reported reservoirs in the assessment unit. This volume is in million barrels of oil (MMBO).

(7) CUMGAS BCF—cumulative production of natural gas from the reported reservoirs in the assessment unit. 

This volume is in billion cubic feet of gas (BCFG).

(8) REMGAS BCF—remaining natural gas reserves in the reported reservoirs in the assessment unit. This volume 

is in billion cubic feet of gas (BCFG).

(9) KRGAS BCF—known recoverable natural gas volume (cumulative production plus remaining reserves) from 

the reported reservoirs in the assessment unit. This volume is in billion cubic feet of gas (BCFG).

(10) CUMNGL MMB—cumulative production of natural gas liquids (NGL) from the reported reservoirs in the 

assessment unit. This volume is in million barrels of natural gas liquids (MMBNGL).

(11) REMNGL MMB—remaining natural gas liquids (NGL) reserves in the reported reservoirs in the assessment 

unit. This volume is in million barrels of natural gas liquids (MMBNGL).

(12) KRNGL MMB—known recoverable natural gas liquids (NGL) volume (cumulative production plus remaining 

reserves) from the reported reservoirs in the assessment unit. This volume is in million barrels of natural gas 

liquids (MMBNGL).

(13) CUMPET MMB—cumulative production of petroleum (oil, gas, and NGL) from the reported reservoirs in the 

assessment unit. This volume is in million barrels of oil equivalent (MMBOE).

(14) REMPET MMB—remaining petroleum (oil, gas, and NGL) reserves in the reported reservoirs in the 

assessment unit. This volume is in million barrels of oil equivalent (MMBOE).

(15) KRPET MMB—known recoverable petroleum (oil, gas, and NGL) volume (cumulative production plus 

remaining reserves) from the reported reservoirs in the assessment unit. This volume is in million barrels of oil 

equivalent (MMBOE).

References Cited

IHS Energy Group, 2006a [includes data current as of December 2005], PI/Dwights Plus US production data: IHS Energy 

Group; database available from IHS Energy Group, 15 Inverness Way East, D205, Englewood, CO 80112, U.S.A.

IHS Energy Group, 2006b [includes data current as of December 2005], PI/Dwights Plus US well data: IHS Energy Group; 

database available from IHS Energy Group, 15 Inverness Way East, D205, Englewood, CO 80112, U.S.A.

NRG Associates, 2002 [includes data current as of December 2000], The significant oil and gas fields of the United States: NRG 

Associates, Inc.; database available from NRG Associates, Inc., P.O. Box 1655, Colorado Springs, CO 80901, U.S.A.

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