## U.S. Department of the Interior **U.S. Geological Survey** 

# Digital Data Series 69–MM **National and Global Petroleum Assessment** 

# U.S. Geological Survey Assessments of Continuous **(Unconventional) Oil and Gas Resources, 2000 to 2011**

### Cover: Dipping beds of the Mowry Shale at the east end of Irish Canyon, Colorado . Photo by Christopher J. Schenk, June 7, 2004.

# U.S. Geological Survey Assessments of **Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

By U.S. Geological Survey U.S. Continuous Resources Assessment Team

National and Global Petroleum Assessment



# Digital Data Series 69–MM

**U.S. Department of the Interior U.S. Geological Survey** 

# U.S. Department of the Interior SALLY JEWELL, Secretary **U.S. Geological Survey** Suzette M. Kimball, Acting Director

U.S. Geological Survey, Reston, Virginia: 2015

For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit http://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod/

.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.
Suggested citation: U.S. Geological Survey U.S. Continuous Resources Assessment Team, 2015, U.S. Geological Surveyassessments of continuous (unconventional) oil and gas resources, 2000 to 2011: U.S. Geological Survey Digital Data Series DDS-69-MM
, 46 p., http://dx.doi.org/10.3133/ds69MM

. ISSN 2327-638X (online) ISSN 2333-0481 (CD/DVD)

### iii


# Members of U.S. Geological Survey U.S. Continuous **Resources Assessment Team**
Lawrence O. Anna Michael E. Brownfield Ronald R. Charpentier James L. Coleman Steven M. Condon Troy A. Cook Russell F. Dubiel Thaddeus S. Dyman Thomas M. Finn Romeo M. Flores Paul C. Hackley Joseph R. Hatch Mitchell E. Henry Timothy C. Hester Robert D. Hettinger Debra K. Higley David W. Houseknecht Ronald C. Johnson Mark A. Kirschbaum Timothy R. Klett Robert C. Milici Philip H. Nelson Mark J. Pawlewicz Krystal M. Pearson Ofori N. Pearson Janet K. Pitman Richard M. Pollastro Jennie L. Ridgley Laura N.R. Roberts Stephen B. Roberts William A. Rouse Robert T. Ryder Christopher J. Schenk Richard G. Stanley Christopher S. Swezey Marilyn E. Tennyson Peter D. Warwick

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# Contents

Members of U.S. Geological Survey U.S. Continuous Resources Assessment Team

...................... iii Abstract

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

..................................................................................................................................................... 1 Data Resources

.............................................................................................................................................. 1 Input Form and Calculation Program Versions

................................................................................ 2 Corrections

............................................................................................................................................. 2 Use as Analogs

...................................................................................................................................... 2 References Cited

.......................................................................................................................................... 26 Appendix 1. Publications Presenting Results of Assessments Used in this Report

..................... 27 CD-ROMs

.............................................................................................................................................. 27 Fact Sheets

.......................................................................................................................................... 28 Appendix 2. Structure of the Files Presented in this Report

............................................................. 31 

# Figures
1. Cloud plot for estimated area of cells (drainage areas) in United States shale-gas assessment units

....................................................................................................... 3 2. Cloud plot for estimated area of cells (drainage areas) in United States coalbed-gas assessment units

................................................................................................... 4 3. Cloud plot for estimated area of cells (drainage areas) in United States tight-gas assessment units

......................................................................................................... 5 4. Cloud plot for estimated area of cells (drainage areas) in United States continuous-oil assessment units

............................................................................................... 6 5. Cloud plot for estimated percent of untested area in sweet spots in United States shale-gas assessment units

.............................................................................. 7 6. Cloud plot for estimated percent of untested area in sweet spots in United States coalbed-gas assessment units

......................................................................... 8 7. Cloud plot for estimated percent of untested area in sweet spots in United States tight-gas assessment units

................................................................................ 9 8. Cloud plot for estimated percent of untested area in sweet spots in United States continuous-oil assessment units

.................................................................... 10 9. Cloud plot for EURs in United States shale-gas assessment units

.................................... 11 10. Cloud plot for EURs in United States coalbed-gas assessment units

................................ 12 11. Cloud plot for EURs in United States tight-gas assessment units

...................................... 13 12. Cloud plot for EURs in United States continuous-oil assessment units

............................ 1 4

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# Tables
1. List of files included in this report

.............................................................................................. 1 2. Input data for estimated area of cells (drainage areas) for United States shale-gas assessment units, values in acres

........................................................................ 15 3. Input data for estimated area of cells (drainage areas) for United States coalbed-gas assessment units, values in acres

................................................................... 16 4. Input data for estimated area of cells (drainage areas) for United States tight-gas assessment units, values in acres

.......................................................................... 17 5. Input data for estimated area of cells (drainage areas) for United States continuous-oil assessment units, values in acres
................................................................ 18 6. Input data for estimated percent of untested area in sweet spots for United States shale-gas assessment units

............................................................................ 19 7. Input data for estimated percent of untested area in sweet spots for United States coalbed-gas assessment units

....................................................................... 20 8. Input data for estimated percent of untested area in sweet spots for United States tight-gas assessment units

.............................................................................. 21 9. Input data for estimated percent of untested area in sweet spots for United States continuous-oil assessment units

.................................................................... 22 10. Input data for estimated ultimate recovery distributions for United States shale-gas assessment units, values in billions of cubic feet of natural gas

.................... 22 11. Input data for estimated ultimate recovery distributions for United States coalbed-gas assessment units, values in billions of cubic feet of natural gas

................ 23 12. Input data for estimated ultimate recovery distributions for United States tight-gas assessment units, values in billions of cubic feet of natural gas

...................... 24 13. Input data for estimated ultimate recovery distributions for United States continuous-oil assessment units, values in millions of barrels of oil

................................. 25

# U.S. Geological Survey Assessments of Continuous **(Unconventional) Oil and Gas Resources, 2000 to 2011**

By U.S. Geological Survey U.S. Continuous Resources Assessment Team

These assessments were previously documented in a series of publications, the list of which is presented in Appendix 1. For some of the assessments, the only previous documentation was a summary of the results in a short USGSFact Sheet. The present report provides more extensive documentation for those assessments than was previously available. Since 2011, the USGS has continued to assess continuous oil and gas resources in the United States and internationally. These assessments, however, used a different methodology (Charpentier and Cook, 2010) that has been modified from the methodology that was used previously. None of these newer assessments are included in this report. 

# Data Resources This report contains extensive documentation of the USGS assessments of continuous accumulations of oil and gasresources. Both the input and output information of the assessments are included. The data are in a collection of spreadsheettables (table 1), in both Microsoft Excel format and tabdelimited format. Descriptions of the variables in each table are presented in Appendix 2. The geographic boundaries of 184 AUs are included in this report as a set of GIS (geographic information system) files. Two AUs (50310261, the Winnipeg-Icebox Continuous Gas AU, and 50640561, the Elvins Shale Gas AU) did not have geographic boundaries established and thus are not included. 

# Abstract From 2000 to 2011, the U.S. Geological Survey conducted 139 quantitative assessments of continuous (unconventional) oil and gas accumulations within the United States. This report documents those assessments more fully than previously done by providing detailed documentation of both the assessment input and output. This report also compiles the data into spreadsheet tables that can be more readily used to provide analogs for future assessments, especially for hypothetical continuous accumulations. 

# Introduction The U.S. Geological Survey (USGS) conducted 139 quantitative assessments of oil and gas potential in continu

ous (unconventional) accumulations from 2000 to 2011. This report provides documentation of the input and output for those assessments in one place and in a more complete fashion than previously published. All of these assessments units (AUs) were for areas within the United States, excepting one that was an extension of a coalbed methane trend into northeast Mexico. All the assessments documented in this report were conducted using the same quantitative methodology. The basic model for this methodology is explained in Schmoker (2003). The input form and operational procedure can be found in Klett and Schmoker (2003). The program itself is available and extensively documented in Crovelli (2012). Additional information is given in Klett and Charpentier (2003).
**Table 1.** List of files included in this report. **Microsoft Excel File Name Tab-delimited File Name**  **Contents** Main Input.xlsx Main Input.tab Data from input forms Ecosystem Allocations.xlsx Ecosystem Allocations.tab Allocations to ecosystem Federal Land Allocations.xlsx Federal Land Allocations.tab Allocations to Federal agency Land Ownership Allocations.xlsx Land Ownership Allocations.tab Allocations to land ownership category State Allocations.xlsx State Allocations.tab Allocations to state Continuous Results.xlsx Continuous Results.tab Assessment results Code List.xlsx Code List.tab Main code list Ecosystem Codes.xlsx Ecosystem Codes.tab Code list for ecosystem names Cloud Plots.xlsx Cloud Plots.tab Data for constructing cloud plots

### 2 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  

## Input Form and Calculation Program Versions These assessments took place over the course of more than a decade, and refinements to both the input form and calculation program were made during the same period. The input form was changed more frequently than the program. In 2003, the input form was revised to accommodate the change in parameter inputs from median values to modal values. Other changes to the input form were primarily made to include additional ancillary variables. The program for calculating the estimates is named “ACCESS,” and several versions exist (Crovelli, 2012). The unnumbered version, originally described in Crovelli (2000), was not used for any official USGS assessments. The first version actually used for assessments is herein termed “version 1,” which was used from 2000 to 2002. Version 1 differed from the previous ACCESS version in that it included a variable for “Percentage of total assessment-unit area that is untested.” Each triangular distribution (used to describe the probability distribution of an input variable) was described by the minimum, median, and maximum values. ACCESS ver

sion 2 was used from 2003 to 2008. Each triangular distribu

tion was described by the minimum, mode, and maximum values. ACCESS version 3 was used from 2009 to 2011. An error was identified in version 2: gas-oil ratio inputs in con

tinuous oil AUs were set as a triangle with minimum, mode, and maximum as 240, 320, and 960, and the program ignored any other input. The error correction was the only change made in version 3. Because the error only affected coproduct volumes and only in oil AUs, there was only minor effect in a few assessments. Both the input form version and the version of the pro

gram used to run the calculations (for AUs that were quantita

tively assessed) are documented in Microsoft Excel and tabdelimited files named “Main Input.” File Main Input includes all the variables for each version of the input form. Thus, some variables will not be populated in file Main Input for a specific AU because that variable was not on the input form used in that assessment. 

## Corrections
Corrections were made to some values in the data tables. Some of these were minor and corrected typographical errors or enforced consistency in naming conventions. The list of codes used in these assessments is included as file “Code List.” Codes in the various original files were checked and changed for consistency where necessary. Changes were also made to the data tables to ensure that allocation percentages added up correctly. The sum of the land ownership allocations should be 100 percent, and the sum of the Federal land allocations should be the percent of Federal land in file “Land Ownership Allocations.” A few corrections were more significant, and these are highlighted in green in the Microsoft Excel versions of the spreadsheets. The most significant corrections are for those values on the original input forms that were different from those values actually used in the resource calculations. Almost all of these are a result of the error in version 2 of the ACCESS program, as explained above. AUs that were defined but not quantitatively assessed are included in the “Main Input” and allocation-related files, but not in the “Continuous Results” or “Cloud Plots” files. These unassessed AUs are highlighted in purple in the Microsoft Excel versions of the spreadsheets. Although some of the orig

inal input forms for these unassessed AUs had some values filled in (such as allocation unit names and area percentages), these values were never checked as they would have been for a quantitative assessment. Therefore, these values are not included in the Main Input file. Only the header information for unassessed AUs is included in the Main Input file. 

## Use as Analogs This report is not only intended to more fully document the assessments of continuous oil and gas resources, but also to provide the information in such a way as to facilitate its use as analog data for subsequent assessments. U.S. Geological Survey Oil and Gas Assessment Team (2012) documented the variability of estimated ultimate recovery (EUR) distributions from these assessments to provide a set of analogs for EURs. In that report, the data were presented in two forms: in tables and in graphs termed “cloud plots.” These two forms of data presentation are also provided herein, not only for estimated EUR distributions but also for estimated cell sizes and estima

tions of the percent of undrilled areas that would be both suc

cessful and in sweet spots. Use of these data for analogs necessitates several caution

ary statements. All the distributions are taken from the assess

ment input distributions. They represent the estimated distribu

tions for undrilled portions of the AU in question. Generally, the distributions for undrilled portions were closely based on data for the drilled portions. Changes from the drilled to the undrilled portions could, however, result from changes in drilling/comple

tion practice or differences in the geology between drilled and undrilled areas. The undrilled portions of the AU were estimated as if drilled using what was the current “best practice” at the time of the assessment. (Dates of the assessments can be found in the “Main Input” file.) Whereas the wells drilled prior to the assessment may have been a mixture of vertical and horizontal wells, the undrilled areas would be estimated as if drilled by either vertical or horizontal wells, whichever was the “best practice” at the time of the assessment. The three variables most useful as analogs are EUR dis

tributions, cell sizes, and percent of undrilled areas that would be both successful and in sweet spots. For each of these vari

ables, the 139 AUs are divided into four groups by reservoir type (shale gas, coalbed gas, tight gas, and continuous oil). Twelve cloud plots (figs. 1 to 12) and 12 tables (tables 2 to 13) summarizing these data are provided in the next sections of this report. The data for the plots are in the Cloud Plots file in the Excel folder of the online downloads directory

.

### Figures **3**

**Figure 1.** Cloud plot for estimated area of cells (drainage areas) in United States shale-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 2. Black diamonds show the mean value for each curve. 10 100 1,000Cell size, in acres 

### Cell Sizes—Shale Gas

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0

### 4 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

10 100 1,000Cell size, in acres **Cell Sizes—Coalbed Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 

### Figure 2. Cloud plot for estimated area of cells (drainage areas) in United States coalbed-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 3. Black diamonds show the mean value for each curve.

### Figures **5**

10 100 1,000Cell size, in acres **Cell Sizes—Tight Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 

### Figure 3. Cloud plot for estimated area of cells (drainage areas) in United States tight-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 4. Black diamonds show the mean value for each curve.

### 6 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

10 100 1,000Cell size, in acres **Cell Sizes—Continuous Oil**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 

### Figure 4. Cloud plot for estimated area of cells (drainage areas) in United States continuous-oil assessment units. Each curve represents one assessment unit and is based on the input data in table 5. Black diamonds show the mean value for each curve.

### Figures **7**

50

40

30

20

10 80 90 100

70

60Percent of untested area in sweet spots **Sweet Spot Percent—Shale Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0


### Figure 5. Cloud plot for estimated percent of untested area in sweet spots in United States shale-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 6. Black diamonds show the mean value for each curve.

### 8 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

50

40

30

20

10 80 90 100

70

60Percent of untested area in sweet spots **Sweet Spot Percent—Coalbed Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0



### Figure 6. Cloud plot for estimated percent of untested area in sweet spots in United States coalbed-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 7. Black diamonds show the mean value for each curve.

### Figures **9**

50

40

30

20

10 80 90 100

70

60Percent of untested area in sweet spots **Sweet Spot Percent—Tight Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0



### Figure 7. Cloud plot for estimated percent of untested area in sweet spots in United States tight-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 8. Black diamonds show the mean value for each curve.

### 10 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

50

40

30

20

10 80 90 100

70

60Percent of untested area in sweet spots **Sweet Spot Percent—Continuous Oil**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0



### Figure 8. Cloud plot for estimated percent of untested area in sweet spots in United States continuous-oil assessment units. Each curve represents one assessment unit and is based on the input data in table 9. Black diamonds show the mean value for each cur ve.

### Figures **11**

1

0.1 100

10Estimated ultimate recovery (BCFG) **EUR—Shale Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0.01



### Figure 9. Cloud plot for EURs in United States shale-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 10. Black diamonds show the mean value for each curve. [EUR, estimated ultimate recovery; BCFG , billions of cubic feet of gas]

### 12 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

1

0.1 100

10Estimated ultimate recovery (BCFG) **EUR—Coalbed Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0.01



### Figure 10. Cloud plot for EURs in United States coalbed-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 11. Black diamonds show the mean value for each curve. [EUR, estimated ultimate recovery; BCFG , billions of cubic feet of gas]

### Figures **13**

1

0.1 100

10Estimated ultimate recovery (BCFG) **EUR—Tight Gas**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0.01



### Figure 11. Cloud plot for EURs in United States tight-gas assessment units. Each curve represents one assessment unit and is based on the input data in table 12. Black diamonds show the mean value for each curve. [EUR, estimated ultimate recovery; BCFG, bill ions of cubic feet of gas]

### 14 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

0.1

0.01

10

1Estimated ultimate recovery (BCFG) **EUR—Continuous Oil**

Fractile, in percent 100 90 80 70 60 50 40 30 20 10 0 0.001



### Figure 12. Cloud plot for EURs in United States continuous-oil assessment units. Each curve represents one assessment unit and is based on the input data in table 13. Black diamonds show the mean value for each curve. [EUR, estimated ultimate recovery; MMBO , millions of barrels of oil]

### Tables **15 Table 2.**  Input data for estimated area of cells (drainage areas) for United States shale-gas assessment units, values in acres. [AU, assessment unit]
**AU number**  **AU name Province**  **Year assessed**  **Minimum cell**  **area Mode**  **of cell area**  **Maximum cell**  **area Mean**  **cell area**  50580161 Woodford Shale Gas Anadarko Basin 2010 60 120 320 166.67 50580261 Thirteen Finger Limestone-Atoka Shale Gas Anadarko Basin 2010 60 120 320 166.67 50620261 Woodford Shale Gas Arkoma Basin 2010 60 120 320 166.67 50620262 Chattanooga Shale Gas Arkoma Basin 2010 60 120 320 166.67 50620364 Caney Shale Gas Arkoma Basin 2010 40 120 320 160.00 50640361 Devonian to Mississippian New Albany Continuous Gas Illinois Basin 2007 80 160 240 160.00 50390761 Niobrara Chalk Denver Basin 2001 35 43.70 400 159.57 50490161 Haynesville Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 80 128 240 149.33 50490163 Mid-Bossier Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 80 128 240 149.33 50490165 Maverick Basin Pearsall Shale Gas Gulf Coast Mesozoic 2010 80 128 240 149.33 50490167 Eagle Ford Shale Gas Gulf Coast Mesozoic 2010 80 128 240 149.33 50670467 Foldbelt Marcellus Appalachian Basin 2011 80 128 240 149.33 50670468 Interior Marcellus Appalachian Basin 2011 80 128 240 149.33 50620362 Fayetteville Shale Gas-High Gamma-Ray Depocenter Arkoma Basin 2010 40 80 320 146.67 50620363 Fayetteville Shale Gas-Western Arkansas Basin Margin Arkoma Basin 2010 40 80 320 146.67 50210362 Cane Creek Shale Gas Paradox Basin 2011 70 120 240 143.33 50210364 Gothic, Chimney Rock, Hovenweep Shale Gas Paradox Basin 2011 70 120 240 143.33 50670469 Western Margin Marcellus Appalachian Basin 2011 20 90 240 116.67 50670463 Devonian Siltstone and Shale Appalachian Basin 2002 20 86.36 240 115.45 50670464 Marcellus Shale Appalachian Basin 2002 20 88.89 200 102.96 50440161 Delaware/Pecos Basins Woodford Continuous Shale Gas Permian Basin 2007 40 80 160 93.33 50440162 Delaware/Pecos Basins Barnett Continuous Shale Gas Permian Basin 2007 40 80 160 93.33 50440163 Midland Basin Woodford/Barnett Continuous Gas Permian Basin 2007 40 80 160 93.33 50630561 Devonian Antrim Continuous Gas Michigan Basin 2004 20 80 160 86.67 50670462 Northwestern Ohio Shale Appalachian Basin 2002 10 74.67 160 81.56 50450161 Greater Newark East Frac-Barrier Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 10 40 110 53.33 50450162 Extended Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 10 40 110 53.33

### 16 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  **Table 3.** Input data for estimated area of cells (drainage areas) for United States coalbed-gas assessment units, values in acres. [AU, assessment unit]
**AU number**  **AU name Province**  **Year assessed**  **Minimum cell**  **area Mode**  **of cell area**  **Maximum cell**  **area Mean**  **cell area**  50220181 Fruitland Fairway Coalbed Gas San Juan Basin 2002 20 149.33 320 163.11 50620481 Arkoma Coalbed Gas Arkoma Basin 2010 40 160 280 160.00 50640481 Desmoinesian-Virgilian Coalbed Gas Illinois Basin 2007 60 160 260 160.00 50350281 Mesaverde Coalbed Gas Wind River Basin 2005 40 120 280 146.67 50350282 Meeteetse Coalbed Gas Wind River Basin 2005 40 120 280 146.67 50410181 Raton Coalbed Gas Raton BasinSierra Grande Uplift 2004 80 120 240 146.67 50410182 Vermejo Coalbed Gas Raton BasinSierra Grande Uplift 2004 80 120 240 146.67 50010181 Nanushuk Formation Coalbed Gas Northern Alaska 2006 40 100 280 140.00 50210581 Kaiparowits Plateau Paradox Basin 2011 40 67 280 129.00 50200181 Northern Coal Fairway/Drunkards Wash Uinta-Piceance 2000 40 66.67 280 128.89 50200281 Uinta Basin Blackhawk Coalbed Gas Uinta-Piceance 2000 40 66.67 280 128.89 50200282 Mesaverde Group Coalbed Gas Uinta-Piceance 2000 40 66.67 280 128.89 50220381 Menefee Coalbed Gas San Juan Basin 2002 40 66.67 280 128.89 50370581 Mesaverde Coalbed Gas Southwestern Wyoming 2002 40 66.67 280 128.89 50370681 Mesaverde Coalbed Gas Southwestern Wyoming 2002 40 66.67 280 128.89 50340281 Mesaverde-Meeteetse Formation Coalbed Gas Big Horn Basin 2008 40 100 240 126.67 50200183 Southern Coal Fairway Uinta-Piceance 2000 40 57.96 250 115.99 50010182 Prince Creek–Tuluvak Formations Coalbed Gas Northern Alaska 2006 40 100 200 113.33 50010183 Sagavanirktok Formation Coalbed Gas Northern Alaska 2006 40 100 200 113.33 50340282 Fort Union Formation Coalbed Gas Big Horn Basin 2008 40 100 200 113.33 50200182 Central Coal Fairway/Buzzards Bench Uinta-Piceance 2000 40 41.39 250 110.46 50200185 Southern Coal Outcrop Uinta-Piceance 2001 40 41.39 250 110.46 50360281 Frontier-Adaville-Evanston Coalbed Gas Wyoming Thrust Belt 2003 40 40 250 110.00 50220182 Basin Fruitland Coalbed Gas San Juan Basin 2002 20 61.82 240 107.27 50311081 Fort Union Coalbed Gas Williston Basin 2008 40 100 180 106.67 50040381 Eocene Coalbed Gas Western OregonWashington 2009 40 80 180 100.00 50030281 Cook Inlet Coalbed Gas Southern Alaska 2011 40 80 140 86.67 50350283 Fort Union Coalbed Gas Wind River Basin 2005 40 80 140 86.67 50330181 Wasatch Formation Powder River Basin 2000 40 68 140 82.67 50330182 Upper Fort Union Formation Powder River Basin 2000 40 68 140 82.67 50330183 Lower Fort Union-Lance Formations Powder River Basin 2000 40 68 140 82.67 50370682 Fort Union Coalbed Gas Southwestern Wyoming 2002 40 68 140 82.67 50370881 Lance Coalbed Gas Southwestern Wyoming 2002 40 68 140 82.67 50370882 Fort Union Coalbed Gas Southwestern Wyoming 2002 40 68 140 82.67 50370981 Wasatch-Green River Coalbed Gas Southwestern Wyoming 2002 40 68 140 82.67 50650281 Warrior Basin Warrior Basin 2002 30 40 120 63.33 50670581 Pocahontas Basin Appalachian Basin 2002 40 46.67 100 62.22 50470381 Wilcox Coalbed Gas Gulf Coast Cenozoic 2007 10 40 120 56.67 50670582 Eastern Dunkard Basin Appalachian Basin 2002 30 36.67 90 52.22 50470281 Cretaceous Olmos Coalbed Gas Gulf Coast Cenozoic 2007 10 40 80 43.33 53000281 Rio Escondido Basin Olmos Coalbed Gas Burgos Basin 2007 10 40 80 43.33

### Tables **17 Table 4.**  Input data for estimated area of cells (drainage areas) for United States tight-gas assessment units, values in acres. [AU, assessment unit]
**AU number**  **AU name Province**  **Year assessed**  **Minimum cell**  **area Mode**  **of cell area**  **Maximum cell**  **area Mean**  **cell area**  50340263 Cody Sandstone Continuous Gas Big Horn Basin 2008 40 160 640 280.00 50350262 Cody Sandstones Continuous Gas Wind River Basin 2005 40 160 640 280.00 50280162 Eagle Sandstone and Claggett Shale East North-Central Montana 2000 80 158.99 320 186.33 50280163 Eagle Sandstone and Claggett Shale West North-Central Montana 2000 80 158.99 320 186.33 50280165 Greenhorn-Lower Belle Fourche North-Central Montana 2000 80 158.99 320 186.33 50280166 Greenhorn-Upper Belle Fourche North-Central Montana 2000 80 158.99 320 186.33 50030161 Tuxedni-Naknek Continuous Gas Southern Alaska 2011 80 140 320 180.00 50370561 Almond Continuous Gas Southwestern Wyoming 2002 40 40.58 449 176.53 50200161 Deep (6,000 feet plus) Coal and Sandstone Gas Uinta-Piceance 2000 60 123.08 320 167.69 50330461 Shallow Continuous Biogenic Gas Powder River Basin 2002 40 137.14 320 165.71 50280161 Judith River Formation North-Central Montana 2000 40 160 280 160.00 50350261 Frontier-Muddy Continuous Gas Wind River Basin 2005 40 120 300 153.33 50620161 Arkoma-Ouachita Foredeep Continuous Arkoma Basin 2010 40 100 320 153.33 50220361 Mesaverde Central-Basin Continuous Gas San Juan Basin 2002 40 88.57 320 149.52 50280164 Niobrara-Carlile North-Central Montana 2000 40 88.57 320 149.52 50220363 Dakota-Greenhorn Continuous Gas San Juan Basin 2002 40 43.59 360 147.86 50200363 Uinta-Piceance Transitional and Migrated Gas Uinta-Piceance 2000 30 124.76 240 131.59 50370261 Mowry Continuous Gas Southwestern Wyoming 2002 40 50.77 300 130.26 50340261 Muddy-Frontier Sandstone and Mowry Fractured Shale Continuous Gas Big Horn Basin 2008 40 50 300 130.00 50050161 Columbia Basin Continuous Gas Eastern Oregon-Washington 2006 40 120 200 120.00 50700161 Taylorsville Basin Continuous Gas Atlantic Coastal Plain 2011 40 80 240 120.00 50700261 Richmond Basin Continuous Gas Atlantic Coastal Plain 2011 40 80 240 120.00 50700361 South Newark Basin Continuous Gas Atlantic Coastal Plain 2011 40 80 240 120.00 50700461 Deep River Basin Continuous Gas Atlantic Coastal Plain 2011 40 80 240 120.00 50701061 Dan River-Danville Basin Continuous Gas Atlantic Coastal Plain 2011 40 80 240 120.00 50200361 Piceance Basin Continuous Gas Uinta-Piceance 2000 30 79.05 240 116.35 50200362 Uinta Basin Continuous Gas Uinta-Piceance 2000 30 79.05 240 116.35 50280167 Bowdoin Dome North-Central Montana 2000 40 121.67 160 107.22 50220261 Lewis Continuous Gas San Juan Basin 2002 40 75 200 105.00 50220362 Mancos Sandstones Continuous Gas San Juan Basin 2002 40 75 200 105.00 50370661 Mesaverde-Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 40 75 200 105.00 50370761 Lewis Continuous Gas Southwestern Wyoming 2002 20 88.89 200 102.96 50670461 Greater Big Sandy Appalachian Basin 2002 20 88.89 200 102.96 50200261 Uinta Basin Continuous Gas Uinta-Piceance 2000 20 40.87 240 100.29 50200262 Uinta Basin Transitional Gas Uinta-Piceance 2000 20 40.87 240 100.29 50220161 Pictured Cliffs Continuous Gas San Juan Basin 2002 40 48.75 200 96.25 50390662 Dakota Group Basin-Center Gas Denver Basin 2001 10 17.39 240 89.13 50370861 Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 20 40 200 86.67 50200264 Piceance Basin Transitional Gas Uinta-Piceance 2000 20 55 180 85.00 50370461 Hilliard-Baxter-Mancos Continuous Gas Southwestern Wyoming 2002 20 55 180 85.00 50370562 Rock Springs-Ericson Continuous Gas Southwestern Wyoming 2002 20 55 180 85.00 50670364 Tuscarora Basin Center Appalachian Basin 2002 40 53.33 160 84.44 50340264 Mesaverde Sandstone Continuous Gas Big Horn Basin 2008 20 50 180 83.33 50350264 Mesaverde-Meeteetse Sandstone Gas Wind River Basin 2005 20 50 180 83.33 50350265 Lance-Fort Union Sandstone Gas Wind River Basin 2005 20 60 160 80.00 50200263 Piceance Basin Continuous Gas Uinta-Piceance 2000 20 20.39 180 73.46 50670465 Catskill Sandstones and Siltstones Appalachian Basin 2002 10 41.54 140 63.85 50670361 Clinton-Medina Basin Center Appalachian Basin 2002 10 12 110 44.00 50670362 Clinton-Medina Transitional Northeast Appalachian Basin 2002 10 12 110 44.00 50670363 Clinton-Medina Transitional Appalachian Basin 2002 10 12 110 44.00 50670466 Berea Sandstone Appalachian Basin 2002 10 34.29 80 41.43

### 18 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  **Table 5.** Input data for estimated area of cells (drainage areas) for United States continuous-oil assessment units, values in acres. [AU, assessment unit]
**AU number**  **AU name Province**  **Year assessed**  **Minimum cell**  **area Mode**  **of cell area**  **Maximum cell**  **area Mean**  **cell area**  50210361 Cane Creek Shale Oil Paradox Basin 2011 80 320 800 400.00 50210363 Gothic, Chimney Rock, Hovenweep Shale Oil Paradox Basin 2011 80 320 800 400.00 50310161 Elm Coulee-Billings Nose Williston Basin 2008 80 320 800 400.00 50310163 Nesson-Little Knife Structural Williston Basin 2008 80 320 800 400.00 50310164 Eastern Expulsion Threshold Williston Basin 2008 80 320 800 400.00 50310165 Northwest Expulsion Threshold Williston Basin 2008 80 320 800 400.00 50200561 Deep Uinta Overpressured Continuous Oil Uinta-Piceance 2000 80 239.20 640 319.73 50310162 Central Basin-Poplar Dome Williston Basin 2008 80 200 640 306.67 50340262 Mowry Fractured Shale Continuous Oil Big Horn Basin 2008 40 185 640 288.33 50330261 Mowry Continuous Oil Powder River Basin 2002 40 183.67 640 287.89 50490170 Eagle Ford Shale Oil Gulf Coast Mesozoic 2010 80 128 320 176.00 50270561 Marias River Shale Continuous Oil Montana Thrust Belt 2002 40 80 400 173.33 50300361 Niobrara Continuous Oil Hanna, Laramie, Shirley Basins 2005 40 160 320 173.33 50370361 Niobrara Continuous Oil Southwestern Wyoming 2002 40 80 400 173.33 50490168 Austin Pearsall-Giddings Area Oil Gulf Coast Mesozoic 2010 100 140 240 160.00 50330361 Niobrara Continuous Oil Powder River Basin 2002 10 87.10 320 139.03 50580162 Woodford Shale Oil Anadarko Basin 2010 10 85 320 138.33 50390261 Fractured Niobrara Limestone (Silo Field Area) Denver Basin 2001 10 10.57 320 113.52 50440165 Spraberry Continuous Oil Permian Basin 2007 40 80 120 80.00 50390661 Niobrara-Codell (Wattenberg Area) Denver Basin 2001 10 18.33 85 37.78

### Tables **19 Table 6.**  Input data for estimated percent of untested area in sweet spots for United States shale-gas assessment units. [AU, assessment unit; %, percent]
**AU number**  **AU name Province**  **Year assessed**  **Minimum sweet**  **spot % Mode**  **of sweet spot %**  **Maximum sweet**  **spot % Mean**  **sweet spot %**  50450161 Greater Newark East Frac-Barrier Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 75 88 95 86.00 50490161 Haynesville Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 35 60 90 61.67 50450162 Extended Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 35 55 90 60.00 50210362 Cane Creek Shale Gas Paradox Basin 2011 5 60 90 51.67 50620362 Fayetteville Shale Gas-High Gamma-Ray Depocenter Arkoma Basin 2010 25 50 80 51.67 50490163 Mid-Bossier Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 15 35 85 45.00 50620261 Woodford Shale Gas Arkoma Basin 2010 10 35 70 38.33 50620363 Fayetteville Shale Gas-Western Arkansas Basin Margin Arkoma Basin 2010 5 40 70 38.33 50670468 Interior Marcellus Appalachian Basin 2011 10 25 75 36.67 50580161 Woodford Shale Gas Anadarko Basin 2010 5 35 60 33.33 50490165 Maverick Basin Pearsall Shale Gas Gulf Coast Mesozoic 2010 1 15 80 32.00 50440163 Midland Basin Woodford/Barnett Continuous Gas Permian Basin 2007 9 25 60 31.33 50440161 Delaware/Pecos Basins Woodford Continuous Shale Gas Permian Basin 2007 12 32 43 29.00 50580261 Thirteen Finger Limestone-Atoka Shale Gas Anadarko Basin 2010 1 20 60 27.00 50670463 Devonian Siltstone and Shale Appalachian Basin 2002 14 19.93 44 25.98 50440162 Delaware/Pecos Basins Barnett Continuous Shale Gas Permian Basin 2007 8 20 43 23.67 50620262 Chattanooga Shale Gas Arkoma Basin 2010 3 18 45 22.00 50210364 Gothic, Chimney Rock, Hovenweep Shale Gas Paradox Basin 2011 0.5 25 40 21.83 50620364 Caney Shale Gas Arkoma Basin 2010 1 20 40 20.33 50490167 Eagle Ford Shale Gas Gulf Coast Mesozoic 2010 0.5 12 30 14.17 50670462 Northwestern Ohio Shale Appalachian Basin 2002 6 8.33 27 13.78 50640361 Devonian to Mississippian New Albany Continuous Gas Illinois Basin 2007 0.4 3 30 11.13 50670464 Marcellus Shale Appalachian Basin 2002 0.1 5.17 17 7.42 50670469 Western Margin Marcellus Appalachian Basin 2011 0.5 6.5 15 7.33 50670467 Foldbelt Marcellus Appalachian Basin 2011 0.5 3 10 4.50 50630561 Devonian Antrim Continuous Gas Michigan Basin 2004 2 3.5 5 3.50 50390761 Niobrara Chalk Denver Basin 2001 0.2 0.25 3.9 1.45

### 20 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  **Table 7.** Input data for estimated percent of untested area in sweet spots for United States coalbed-gas assessment units. [AU, assessment unit; %, percent]
**AU number**  **AU name Province**  **Year assessed**  **Minimum sweet**  **spot % Mode**  **of sweet spot %**  **Maximum sweet**  **spot % Mean**  **sweet spot %**  50220181 Fruitland Fairway Coalbed Gas San Juan Basin 2002 93 95 97 95.00 50220182 Basin Fruitland Coalbed Gas San Juan Basin 2002 45 58.33 60 54.44 50200181 Northern Coal Fairway/Drunkards Wash Uinta-Piceance 2000 10 68.70 79 52.57 50670581 Pocahontas Basin Appalachian Basin 2002 35 42 60 45.67 50200182 Central Coal Fairway/Buzzards Bench Uinta-Piceance 2000 5 48.56 55 36.19 50620481 Arkoma Coalbed Gas Arkoma Basin 2010 15 30 60 35.00 50200185 Southern Coal Outcrop Uinta-Piceance 2001 8 16 80 34.67 50330182 Upper Fort Union Formation Powder River Basin 2000 10 31.96 58 33.32 50200183 Southern Coal Fairway Uinta-Piceance 2000 1 48.18 50 33.06 50410182 Vermejo Coalbed Gas Raton BasinSierra Grande Uplift 2004 10 25 50 28.33 50650281 Warrior Basin Warrior Basin 2002 9.2 30.66 39.4 26.42 50030281 Cook Inlet Coalbed Gas Southern Alaska 2011 0.5 6 63 23.17 50670582 Eastern Dunkard Basin Appalachian Basin 2002 4 20.52 35 19.84 50210581 Kaiparowits Plateau Paradox Basin 2011 0.5 15 40 18.50 50360281 Frontier-Adaville-Evanston Coalbed Gas Wyoming Thrust Belt 2003 1 10 41 17.33 50410181 Raton Coalbed Gas Raton BasinSierra Grande Uplift 2004 4 13 34 17.00 50010181 Nanushuk Formation Coalbed Gas Northern Alaska 2006 0.5 7.5 38 15.33 50010183 Sagavanirktok Formation Coalbed Gas Northern Alaska 2006 0.3 8 35 14.43 50330181 Wasatch Formation Powder River Basin 2000 1 13.52 24 12.84 53000281 Rio Escondido Basin Olmos Coalbed Gas Burgos Basin 2007 1 11 25 12.33 50350281 Mesaverde Coalbed Gas Wind River Basin 2005 1 7 27 11.67 50370882 Fort Union Coalbed Gas Southwestern Wyoming 2002 3 8.24 20 10.41 50370581 Mesaverde Coalbed Gas Southwestern Wyoming 2002 1 9.47 20 10.16 50370681 Mesaverde Coalbed Gas Southwestern Wyoming 2002 1 9.47 20 10.16 50220381 Menefee Coalbed Gas San Juan Basin 2002 1 2.08 27 10.03 50470281 Cretaceous Olmos Coalbed Gas Gulf Coast Cenozoic 2007 1 8 20 9.67 50040381 Eocene Coalbed Gas Western OregonWashington 2009 1 3.10 22 8.70 50470381 Wilcox Coalbed Gas Gulf Coast Cenozoic 2007 0.1 5 20 8.37 50200281 Uinta Basin Blackhawk Coalbed Gas Uinta-Piceance 2000 0.5 2.67 20 7.72 50640481 Desmoinesian-Virgilian Coalbed Gas Illinois Basin 2007 0.25 4 16 6.75 50370981 Wasatch-Green River Coalbed Gas Southwestern Wyoming 2002 1 3.43 15 6.48 50010182 Prince Creek–Tuluvak Formations Coalbed Gas Northern Alaska 2006 0.2 5 14 6.40 50350282 Meeteetse Coalbed Gas Wind River Basin 2005 1 3 15 6.33 50340281 Mesaverde-Meeteetse Formation Coalbed Gas Big Horn Basin 2008 0.5 2.50 14 5.67 50200282 Mesaverde Group Coalbed Gas Uinta-Piceance 2000 1 1.54 14 5.51 50350283 Fort Union Coalbed Gas Wind River Basin 2005 0.5 3 13 5.50 50370682 Fort Union Coalbed Gas Southwestern Wyoming 2002 1 2 10 4.33 50330183 Lower Fort Union-Lance Formations Powder River Basin 2000 0.002 1.00 9 3.33 50370881 Lance Coalbed Gas Southwestern Wyoming 2002 1 1.67 7 3.22 50311081 Fort Union Coalbed Gas Williston Basin 2008 0.01 2 7 3.00 50340282 Fort Union Formation Coalbed Gas Big Horn Basin 2008 0.1 1 3 1.37

### Tables **21 Table 8.**  Input data for estimated percent of untested area in sweet spots for United States tight-gas assessment units. [AU, assessment unit; %, percent]
**AU number**  **AU name Province**  **Year assessed**  **Minimum sweet**  **spot % Mode**  **of sweet spot %**  **Maximum sweet**  **spot % Mean**  **sweet spot %**  50220362 Mancos Sandstones Continuous Gas San Juan Basin 2002 35 66.25 75 58.75 50220363 Dakota-Greenhorn Continuous Gas San Juan Basin 2002 46 46.6 76 56.20 50670363 Clinton-Medina Transitional Appalachian Basin 2002 40 50.84 77 55.95 50670461 Greater Big Sandy Appalachian Basin 2002 14 61.35 85 53.45 50370561 Almond Continuous Gas Southwestern Wyoming 2002 35 47.90 76 52.97 50670361 Clinton-Medina Basin Center Appalachian Basin 2002 10 51.03 88 49.68 50370562 Rock Springs-Ericson Continuous Gas Southwestern Wyoming 2002 28 45.82 72 48.61 50370761 Lewis Continuous Gas Southwestern Wyoming 2002 18 40.41 69 42.47 50030161 Tuxedni-Naknek Continuous Gas Southern Alaska 2011 0.5 24 95 39.83 50220161 Pictured Cliffs Continuous Gas San Juan Basin 2002 14 46.06 47 35.69 50700261 Richmond Basin Continuous Gas Atlantic Coastal Plain 2011 7.5 21 76 34.83 50700361 South Newark Basin Continuous Gas Atlantic Coastal Plain 2011 1 21 81 34.33 50220261 Lewis Continuous Gas San Juan Basin 2002 23 37.24 40 33.41 50700461 Deep River Basin Continuous Gas Atlantic Coastal Plain 2011 6 21 71 32.67 50390662 Dakota Group Basin-Center Gas Denver Basin 2001 20 27 45 30.67 50200261 Uinta Basin Continuous Gas Uinta-Piceance 2000 4 33.39 50 29.13 50670465 Catskill Sandstones and Siltstones Appalachian Basin 2002 15 17.42 53 28.47 50700161 Taylorsville Basin Continuous Gas Atlantic Coastal Plain 2011 6 19 60 28.33 50200363 Uinta-Piceance Transitional and Migrated Gas Uinta-Piceance 2000 20 29.14 34 27.71 50370661 Mesaverde-Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 14 16.55 45 25.18 50370861 Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 5 27.86 40 24.29 50620161 Arkoma-Ouachita Foredeep Continuous Arkoma Basin 2010 2 20 50 24.00 50050161 Columbia Basin Continuous Gas Eastern Oregon-Washington 2006 5 20 40 21.67 50220361 Mesaverde Central-Basin Continuous Gas San Juan Basin 2002 15 23.91 26 21.64 50670466 Berea Sandstone Appalachian Basin 2002 3 5.15 55 21.05 50200262 Uinta Basin Transitional Gas Uinta-Piceance 2000 12 13.08 38 21.03 50200263 Piceance Basin Continuous Gas Uinta-Piceance 2000 8 18.33 35 20.44 50280167 Bowdoin Dome North-Central Montana 2000 8 20 32 20.00 50200361 Piceance Basin Continuous Gas Uinta-Piceance 2000 4 6.29 49 19.76 50670362 Clinton-Medina Transitional Northeast Appalachian Basin 2002 2 4.63 50 18.88 50701061 Dan River-Danville Basin Continuous Gas Atlantic Coastal Plain 2011 0.2 5 45 16.73 50370461 Hilliard-Baxter-Mancos Continuous Gas Southwestern Wyoming 2002 2 7.53 36 15.18 50200264 Piceance Basin Transitional Gas Uinta-Piceance 2000 1 13.74 20 11.58 50200161 Deep (6,000 feet plus) Coal and Sandstone Gas Uinta-Piceance 2000 1 2.41 30 11.14 50200362 Uinta Basin Continuous Gas Uinta-Piceance 2000 5 5.54 18 9.51 50370261 Mowry Continuous Gas Southwestern Wyoming 2002 6 9 12 9.00 50340261 Muddy-Frontier Sandstone and Mowry Fractured Shale Continuous Gas Big Horn Basin 2008 0.6 2 22.5 8.37 50340263 Cody Sandstone Continuous Gas Big Horn Basin 2008 0.3 3 19.6 7.63 50280161 Judith River Formation North-Central Montana 2000 0.1 0.30 20 6.80 50350265 Lance-Fort Union Sandstone Gas Wind River Basin 2005 2 4 12 6.00 50280163 Eagle Sandstone and Claggett Shale West North-Central Montana 2000 0.8 2.51 13 5.44 50330461 Shallow Continuous Biogenic Gas Powder River Basin 2002 1 2.72 12.5 5.41 50350261 Frontier-Muddy Continuous Gas Wind River Basin 2005 0.7 1.6 9 3.77 50340264 Mesaverde Sandstone Continuous Gas Big Horn Basin 2008 0.2 2.1 8.5 3.60 50350262 Cody Sandstones Continuous Gas Wind River Basin 2005 0.8 1.4 8 3.40 50350264 Mesaverde-Meeteetse Sandstone Gas Wind River Basin 2005 0.5 1.5 7 3.00 50280162 Eagle Sandstone and Claggett Shale East North-Central Montana 2000 0.1 1.33 5 2.14 50280166 Greenhorn-Upper Belle Fourche North-Central Montana 2000 0.1 0.16 3.1 1.12 50670364 Tuscarora Basin Center Appalachian Basin 2002 0.1 0.29 2.6 1.00 50280165 Greenhorn-Lower Belle Fourche North-Central Montana 2000 0.1 0.14 2.1 0.78 50280164 Niobrara-Carlile North-Central Montana 2000 0.01 0.04 1 0.35

### 22 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  **Table 9.** Input data for estimated percent of untested area in sweet spots for United States continuous-oil assessment units. [AU, assessment unit; %, percent]
**AU number**  **AU name Province**  **Year assessed**  **Minimum sweet**  **spot % Mode**  **of sweet spot %**  **Maximum sweet**  **spot % Mean**  **sweet spot %**  50310161 Elm Coulee-Billings Nose Williston Basin 2008 80 92 95 89.00 50310163 Nesson-Little Knife Structural Williston Basin 2008 75 92 98 88.33 50310164 Eastern Expulsion Threshold Williston Basin 2008 70 85 96 83.67 50310162 Central Basin-Poplar Dome Williston Basin 2008 50 80 92 74.00 50310165 Northwest Expulsion Threshold Williston Basin 2008 30 75 92 65.67 50200561 Deep Uinta Overpressured Continuous Oil Uinta-Piceance 2000 35 40 80 51.67 50440165 Spraberry Continuous Oil Permian Basin 2007 22 58 66 48.67 50210361 Cane Creek Shale Oil Paradox Basin 2011 5 35 92 44.00 50490168 Austin Pearsall-Giddings Area Oil Gulf Coast Mesozoic 2010 16 30 75 40.33 50330261 Mowry Continuous Oil Powder River Basin 2002 8 23.38 45 25.46 50490170 Eagle Ford Shale Oil Gulf Coast Mesozoic 2010 0.5 9 40 16.50 50330361 Niobrara Continuous Oil Powder River Basin 2002 4.1 17.20 27.2 16.17 50210363 Gothic, Chimney Rock, Hovenweep Shale Oil Paradox Basin 2011 0.5 15 30 15.17 50300361 Niobrara Continuous Oil Hanna, Laramie, Shirley Basins 2005 1 4 25 10.00 50390661 Niobrara-Codell (Wattenberg Area) Denver Basin 2001 2 5.15 15 7.38 50580162 Woodford Shale Oil Anadarko Basin 2010 0.25 5 15 6.75 50340262 Mowry Fractured Shale Continuous Oil Big Horn Basin 2008 0.1 1.25 17 6.12 50370361 Niobrara Continuous Oil Southwestern Wyoming 2002 2 5 8 5.00 50390261 Fractured Niobrara Limestone (Silo Field Area) Denver Basin 2001 2 2.67 8 4.22 50270561 Marias River Shale Continuous Oil Montana Thrust Belt 2002 0.5 2.6 8 3.70



### Table 10. Input data for estimated ultimate recovery distributions for United States shale-gas assessment units, values in billions of cubic feet of natural gas. [AU, assessment unit; EUR, estimated ultimate recovery] **AU number**  **AU name Province**  **Year assessed**  **Minimum EUR**  **Median EUR**  **Maximum EUR**  **Mean EUR**  50490161 Haynesville Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 0.02 2 20 2.617 50490163 Mid-Bossier Sabine Platform Shale Gas Gulf Coast Mesozoic 2010 0.02 1 10 1.308 50580161 Woodford Shale Gas Anadarko Basin 2010 0.02 0.8 15 1.233 50670468 Interior Marcellus Appalachian Basin 2011 0.02 0.8 12 1.158 50490167 Eagle Ford Shale Gas Gulf Coast Mesozoic 2010 0.02 0.8 10 1.104 50620362 Fayetteville Shale Gas-High GammaRay Depocenter Arkoma Basin 2010 0.02 0.8 10 1.104 50450161 Greater Newark East Frac-Barrier Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 0.02 0.7 10 1.000 50440161 Delaware/Pecos Basins Woodford Continuous Shale Gas Permian Basin 2007 0.02 0.6 8 0.842 50440162 Delaware/Pecos Basins Barnett Continuous Shale Gas Permian Basin 2007 0.02 0.6 8 0.842 50580261 Thirteen Finger Limestone-Atoka Shale Gas Anadarko Basin 2010 0.02 0.5 10 0.785 50620261 Woodford Shale Gas Arkoma Basin 2010 0.02 0.5 10 0.785 50210364 Gothic, Chimney Rock, Hovenweep Shale Gas Paradox Basin 2011 0.02 0.4 10 0.672 50630561 Devonian Antrim Continuous Gas Michigan Basin 2004 0.02 0.4 4 0.523 50620363 Fayetteville Shale Gas - Western Arkansas Basin Margin Arkoma Basin 2010 0.02 0.3 6 0.470 50210362 Cane Creek Shale Gas Paradox Basin 2011 0.02 0.3 5 0.446 50440163 Midland Basin Woodford/Barnett Continuous Gas Permian Basin 2007 0.02 0.3 5 0.446 50490165 Maverick Basin Pearsall Shale Gas Gulf Coast Mesozoic 2010 0.02 0.25 5 0.391 50450162 Extended Continuous Barnett Shale Gas Bend ArchFort Worth Basin 2003 0.02 0.2 5 0.334 50390761 Niobrara Chalk Denver Basin 2001 0.025 0.2 2 0.261 50620262 Chattanooga Shale Gas Arkoma Basin 2010 0.02 0.1 6 0.223 50670467 Foldbelt Marcellus Appalachian Basin 2011 0.02 0.1 5 0.208 50620364 Caney Shale Gas Arkoma Basin 2010 0.02 0.08 5 0.179 50670469 Western Margin Marcellus Appalachian Basin 2011 0.02 0.05 5 0.129 50640361 Devonian to Mississippian New Albany Continuous Gas Illinois Basin 2007 0.01 0.08 1 0.110 50670462 Northwestern Ohio Shale Appalachian Basin 2002 0.01 0.04 0.5 0.055 50670463 Devonian Siltstone and Shale Appalachian Basin 2002 0.01 0.03 0.5 0.044 50670464 Marcellus Shale Appalachian Basin 2002 0.01 0.03 0.5 0.044

### Tables **23 Table 11.**  Input data for estimated ultimate recovery distributions for United States coalbed-gas assessment units, values in billions of cubic feet of natural gas. [AU, assessment unit; EUR, estimated ultimate recovery] **AU number**  **AU name Province**  **Year assessed**  **Minimum EUR**  **Median EUR**  **Maximum EUR**  **Mean EUR**  50220181 Fruitland Fairway Coalbed Gas San Juan Basin 2002 0.02 8 40 9.125 50200181 Northern Coal Fairway/Drunkards Wash Uinta-Piceance 2000 0.05 0.8 12 1.156 50220182 Basin Fruitland Coalbed Gas San Juan Basin 2002 0.02 0.6 20 1.110 50200182 Central Coal Fairway/Buzzards Bench Uinta-Piceance 2000 0.05 0.4 10 0.666 50010181 Nanushuk Formation Coalbed Gas Northern Alaska 2006 0.02 0.25 12 0.524 50410182 Vermejo Coalbed Gas Raton BasinSierra Grande Uplift 2004 0.02 0.25 9.5 0.481 50200281 Uinta Basin Blackhawk Coalbed Gas Uinta-Piceance 2000 0.05 0.25 10 0.480 50360281 Frontier-Adaville-Evanston Coalbed Gas Wyoming Thrust Belt 2003 0.02 0.4 2 0.456 50410181 Raton Coalbed Gas Raton BasinSierra Grande Uplift 2004 0.02 0.25 8 0.453 50650281 Warrior Basin Warrior Basin 2002 0.01 0.25 5 0.392 50620481 Arkoma Coalbed Gas Arkoma Basin 2010 0.02 0.3 3 0.392 50330182 Upper Fort Union Formation Powder River Basin 2000 0.02 0.23 4 0.345 50200183 Southern Coal Fairway Uinta-Piceance 2000 0.05 0.2 5 0.328 50210581 Kaiparowits Plateau Paradox Basin 2011 0.02 0.2 4 0.312 50010183 Sagavanirktok Formation Coalbed Gas Northern Alaska 2006 0.02 0.18 5 0.310 50330181 Wasatch Formation Powder River Basin 2000 0.02 0.18 3 0.267 50370882 Fort Union Coalbed Gas Southwestern Wyoming 2002 0.02 0.2 1.5 0.246 50670581 Pocahontas Basin Appalachian Basin 2002 0.01 0.15 2 0.210 50350281 Mesaverde Coalbed Gas Wind River Basin 2005 0.02 0.1 5 0.208 50030281 Cook Inlet Coalbed Gas Southern Alaska 2011 0.02 0.16 1.5 0.206 50370881 Lance Coalbed Gas Southwestern Wyoming 2002 0.02 0.15 1 0.180 50200282 Mesaverde Group Coalbed Gas Uinta-Piceance 2000 0.02 0.08 5 0.179 50220381 Menefee Coalbed Gas San Juan Basin 2002 0.02 0.08 5 0.179 50200185 Southern Coal Outcrop Uinta-Piceance 2001 0.05 0.1 3 0.165 50670582 Eastern Dunkard Basin Appalachian Basin 2002 0.01 0.1 2 0.156 50040381 Eocene Coalbed Gas Western OregonWashington 2009 0.02 0.1 2 0.155 50010182 Prince Creek–Tuluvak Formations Coalbed Gas Northern Alaska 2006 0.02 0.1 1.5 0.143 50340281 Mesaverde-Meeteetse Formation Coalbed Gas Big Horn Basin 2008 0.02 0.1 1.2 0.136 50350282 Meeteetse Coalbed Gas Wind River Basin 2005 0.02 0.08 2 0.131 50350283 Fort Union Coalbed Gas Wind River Basin 2005 0.02 0.08 2 0.131 50370682 Fort Union Coalbed Gas Southwestern Wyoming 2002 0.02 0.1 1 0.130 50370981 Wasatch-Green River Coalbed Gas Southwestern Wyoming 2002 0.02 0.1 0.8 0.124 50311081 Fort Union Coalbed Gas Williston Basin 2008 0.02 0.085 1 0.114 50330183 Lower Fort Union-Lance Formations Powder River Basin 2000 0.02 0.085 1 0.114 50340282 Fort Union Formation Coalbed Gas Big Horn Basin 2008 0.02 0.08 1 0.109 50370581 Mesaverde Coalbed Gas Southwestern Wyoming 2002 0.02 0.06 2 0.106 50370681 Mesaverde Coalbed Gas Southwestern Wyoming 2002 0.02 0.06 2 0.106 50470381 Wilcox Coalbed Gas Gulf Coast Cenozoic 2007 0.01 0.05 0.5 0.065 53000281 Rio Escondido Basin Olmos Coalbed Gas Burgos Basin 2007 0.01 0.03 0.3 0.039 50640481 Desmoinesian-Virgilian Coalbed Gas Illinois Basin 2007 0.01 0.03 0.25 0.037 50470281 Cretaceous Olmos Coalbed Gas Gulf Coast Cenozoic 2007 0.01 0.03 0.1 0.032

### 24 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  **Table 12.** Input data for estimated ultimate recovery distributions for United States tight-gas assessment units, values in billions of cubic feet of natural gas. [AU, assessment unit; EUR, estimated ultimate recovery] **AU number**  **AU name Province**  **Year assessed**  **Minimum EUR**  **Median EUR**  **Maximum EUR**  **Mean EUR**  50370661 Mesaverde-Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 0.02 1.2 15 1.657 50370561 Almond Continuous Gas Southwestern Wyoming 2002 0.02 0.9 20 1.460 50200261 Uinta Basin Continuous Gas Uinta-Piceance 2000 0.02 0.5 40 1.293 50030161 Tuxedni-Naknek Continuous Gas Southern Alaska 2011 0.02 0.6 30 1.286 50620161 Arkoma-Ouachita Foredeep Continuous Arkoma Basin 2010 0.02 0.6 30 1.286 50350261 Frontier-Muddy Continuous Gas Wind River Basin 2005 0.02 0.7 15 1.123 50370261 Mowry Continuous Gas Southwestern Wyoming 2002 0.02 0.7 15 1.123 50350265 Lance-Fort Union Sandstone Gas Wind River Basin 2005 0.02 0.6 20 1.110 50370861 Lance-Fort Union Continuous Gas Southwestern Wyoming 2002 0.02 0.8 10 1.104 50370761 Lewis Continuous Gas Southwestern Wyoming 2002 0.02 0.6 15 1.009 50200362 Uinta Basin Continuous Gas Uinta-Piceance 2000 0.02 0.5 16 0.911 50200263 Piceance Basin Continuous Gas Uinta-Piceance 2000 0.02 0.5 15 0.892 50350264 Mesaverde-Meeteetse Sandstone Gas Wind River Basin 2005 0.02 0.5 15 0.892 50350262 Cody Sandstones Continuous Gas Wind River Basin 2005 0.02 0.4 20 0.855 50670364 Tuscarora Basin Center Appalachian Basin 2002 0.01 0.7 4 0.817 50220261 Lewis Continuous Gas San Juan Basin 2002 0.02 0.5 6 0.683 50220361 Mesaverde Central-Basin Continuous Gas San Juan Basin 2002 0.02 0.5 6 0.683 50220363 Dakota-Greenhorn Continuous Gas San Juan Basin 2002 0.02 0.4 8 0.627 50370461 Hilliard-Baxter-Mancos Continuous Gas Southwestern Wyoming 2002 0.02 0.4 8 0.627 50700261 Richmond Basin Continuous Gas Atlantic Coastal Plain 2011 0.02 0.4 8 0.627 50700461 Deep River Basin Continuous Gas Atlantic Coastal Plain 2011 0.02 0.4 8 0.627 50200161 Deep (6,000 feet plus) Coal and Sandstone Gas Uinta-Piceance 2000 0.2 0.5 4 0.617 50200262 Uinta Basin Transitional Gas Uinta-Piceance 2000 0.02 0.25 15 0.570 50340261 Muddy-Frontier Sandstone and Mowry Fractured Shale Continuous Gas Big Horn Basin 2008 0.02 0.35 7.5 0.560 50220362 Mancos Sandstones Continuous Gas San Juan Basin 2002 0.02 0.35 5 0.499 50370562 Rock Springs-Ericson Continuous Gas Southwestern Wyoming 2002 0.02 0.4 3 0.491 50200361 Piceance Basin Continuous Gas Uinta-Piceance 2000 0.02 0.25 10 0.490 50280163 Eagle Sandstone and Claggett Shale West North-Central Montana 2000 0.01 0.25 9 0.475 50220161 Pictured Cliffs Continuous Gas San Juan Basin 2002 0.02 0.25 7 0.434 50280162 Eagle Sandstone and Claggett Shale East North-Central Montana 2000 0.01 0.2 7 0.375 50200363 Uinta-Piceance Transitional and Migrated Gas Uinta-Piceance 2000 0.02 0.2 7 0.373 50200264 Piceance Basin Transitional Gas Uinta-Piceance 2000 0.02 0.25 4 0.367 50280166 Greenhorn-Upper Belle Fourche North-Central Montana 2000 0.01 0.2 6 0.356 50280167 Bowdoin Dome North-Central Montana 2000 0.01 0.2 5 0.336 50340263 Cody Sandstone Continuous Gas Big Horn Basin 2008 0.02 0.2 5 0.334 50340264 Mesaverde Sandstone Continuous Gas Big Horn Basin 2008 0.02 0.2 5 0.334 50700161 Taylorsville Basin Continuous Gas Atlantic Coastal Plain 2011 0.02 0.2 5 0.334 50700361 South Newark Basin Continuous Gas Atlantic Coastal Plain 2011 0.02 0.2 5 0.334 50280165 Greenhorn-Lower Belle Fourche North-Central Montana 2000 0.01 0.25 2.5 0.327 50050161 Columbia Basin Continuous Gas Eastern OregonWashington 2006 0.02 0.2 3 0.288 50390662 Dakota Group Basin-Center Gas Denver Basin 2001 0.02 0.2 2.5 0.275 50670461 Greater Big Sandy Appalachian Basin 2002 0.01 0.15 2 0.210 50701061 Dan River-Danville Basin Continuous Gas Atlantic Coastal Plain 2011 0.02 0.1 2.5 0.165 50330461 Shallow Continuous Biogenic Gas Powder River Basin 2002 0.01 0.08 1.5 0.122 50670361 Clinton-Medina Basin Center Appalachian Basin 2002 0.01 0.08 1.2 0.115 50670465 Catskill Sandstones and Siltstones Appalachian Basin 2002 0.01 0.07 1.5 0.111 50280161 Judith River Formation North-Central Montana 2000 0.01 0.06 2 0.109 50280164 Niobrara-Carlile North-Central Montana 2000 0.01 0.07 1 0.099 50670363 Clinton-Medina Transitional Appalachian Basin 2002 0.01 0.06 1 0.089 50670362 Clinton-Medina Transitional Northeast Appalachian Basin 2002 0.01 0.06 0.9 0.086 50670466 Berea Sandstone Appalachian Basin 2002 0.01 0.03 0.5 0.044

### Tables **25 Table 13.**  Input data for estimated ultimate recovery distributions for United States continuous-oil assessment units, values in millions of barrels of oil. [AU, assessment unit; EUR, estimated ultimate recovery] **AU number**  **AU name**  **Province Year**  **assessed Minimum**  **EUR Median**  **EUR Maximum**  **EUR Mean**  **EUR** 50310164 Eastern Expulsion Threshold Williston Basin 2008 0.002 0.12 5 0.241 50310163 Nesson-Little Knife Structural Williston Basin 2008 0.002 0.09 4 0.185 50210361 Cane Creek Shale Oil Paradox Basin 2011 0.002 0.08 3 0.154 50310165 Northwest Expulsion Threshold Williston Basin 2008 0.002 0.065 4 0.151 50310161 Elm Coulee-Billings Nose Williston Basin 2008 0.002 0.08 2 0.135 50270561 Marias River Shale Continuous Oil Montana Thrust Belt 2002 0.001 0.08 1.6 0.126 50370361 Niobrara Continuous Oil Southwestern Wyoming 2002 0.001 0.08 1.6 0.126 50300361 Niobrara Continuous Oil Hanna, Laramie, Shirley Basins 2005 0.001 0.04 1.6 0.079 50310162 Central Basin-Poplar Dome Williston Basin 2008 0.002 0.025 2 0.064 50210363 Gothic, Chimney Rock, Hovenweep Shale Oil Paradox Basin 2011 0.002 0.03 1.5 0.064 50580162 Woodford Shale Oil Anadarko Basin 2010 0.003 0.03 1.5 0.064 50200561 Deep Uinta Overpressured Continuous Oil Uinta-Piceance 2000 0.003 0.045 0.45 0.059 50440165 Spraberry Continuous Oil Permian Basin 2007 0.001 0.045 0.4 0.057 50490170 Eagle Ford Shale Oil Gulf Coast Mesozoic 2010 0.002 0.03 1 0.055 50490168 Austin Pearsall-Giddings Area Oil Gulf Coast Mesozoic 2010 0.002 0.04 0.5 0.055 50330361 Niobrara Continuous Oil Powder River Basin 2002 0.002 0.028 0.5 0.042 50330261 Mowry Continuous Oil Powder River Basin 2002 0.002 0.025 0.35 0.035 50340262 Mowry Fractured Shale Continuous Oil Big Horn Basin 2008 0.002 0.025 0.35 0.035 50390261 Fractured Niobrara Limestone (Silo Field Area) Denver Basin 2001 0.002 0.022 0.4 0.033 50390661 Niobrara-Codell (Wattenberg Area) Denver Basin 2001 0.003 0.008 0.1 0.011

### 26 **U.S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 

# References Cited
Charpentier, R.R., and Cook, T.A., 2010, Improved USGS

methodology for assessing continuous petroleum resources: U.S. Geological Survey Data Series 547, 22 p. and program, http://pubs.usgs.gov/ds/547/

. Crovelli, R.A., 2000, Analytical resource assessment method for continuous (unconventional) oil and gas accumulations— The “ACCESS” Method: U.S. Geological Survey Open-File Report 00–044, 34 p., http://pubs.er.usgs.gov/publication/ ofr0044

. Crovelli, R.A., 2012, Analytical resource assessment method for continuous (unconventional) oil and gas accumulations— The “ACCESS” Method: U.S. Geological Survey Open-File Report 2012–1146, 32 p., http://pubs.usgs.gov/of/2012/1146

. [Revised by Charpentier, R.R.] Klett, T.R., and Charpentier, R.R., 2003, FORSPAN model users guide: U.S. Geological Survey Open-File Report 03–354, 37 p., http://pubs.usgs.gov/of/2003/ofr-03-354/

. Klett, T.R., and Schmoker, J.W., 2003, U.S. Geological Survey input-data form and operational procedure for the assessment of continuous petroleum accumulations, chap. 18 of USGS Uinta-Piceance Assessment Team, Petroleum systems and geologic assessment of oil and gas in the Uinta-Piceance Prov

ince, Utah and Colorado: U.S. Geological Survey Digital Data Series DDS–69–B, 8 p., http://pubs.usgs.gov/dds/dds-069/ dds-069-b/REPORTS/Chapter_18.pdf

. Schmoker, J.W., 2003, U.S. Geological Survey assessment

concepts for continuous petroleum accumulations, chap. 17 of USGS Uinta-Piceance Assessment Team, Petroleum systems and geologic assessment of oil and gas in the Uinta-Piceance Province, Utah and Colorado: U.S. Geological Survey Digital Data Series DDS–69–B, 7 p., http://pubs.usgs.gov/dds/ dds-069/dds-069-b/REPORTS/Chapter_17.pdf

. U.S. Geological Survey Oil and Gas Assessment Team, 2012, Variability of distributions of well-scale estimated ultimate recovery for continuous (unconventional) oil and gas resources in the United States: U.S. Geological Survey Open-File Report 2012–1118, 18 p., http://pubs.usgs.gov/of/2012/1118/

.

### Appendix 1 **27** 

# Appendix 1. **Publications Presenting Results of Assessments Used in this Report**

U.S. Geological Survey Powder River Basin Assessment Team., 2009, Total petroleum systems and geologic assess

ment of oil and gas resources in the Powder River Basin Province, Wyoming and Montana: U.S. Geological Survey Digital Data Series DDS–69–U, 3 chapters, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-u/ . [Revised April 2010] U.S. Geological Survey Powder River Basin Province Assess

ment Team, 2004, Total petroleum system and assessment of coalbed gas in the Powder River Basin Province, Wyo

ming and Montana : U.S. Geological Survey Digital Data Series DDS– 69-C, 1 CD-ROM, http://pubs.usgs.gov/dds/ dds-069/dds-069-c/

. U.S. Geological Survey San Juan Basin Assessment Team, 2013, Total petroleum systems and geologic assessment of undis

covered oil and gas resources in the San Juan Basin Province, exclusive of Paleozoic rocks, New Mexico and Colorado: U.S. Geological Survey Digital Data Series 69–F, 7 chap

ters, variously paged, 1 CD-ROM, http://pubs.usgs.gov/dds/ dds-069/dds-069-f/

. U.S. Geological Survey Southwestern Wyoming Province Assessment Team, 2005, Petroleum systems and geologic assessment of oil and gas in the Southwestern Wyoming Province, Wyoming, Colorado and Utah : U.S. Geologi

cal Survey Digital Data Series DDS– 69-D, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-d/

. U.S. Geological Survey Uinta-Piceance Assessment Team, compilers, 2003, Petroleum systems and geologic assess

ment of oil and gas in the Uinta-Piceance Province, Utah and Colorado : U.S. Geological Survey Digital Data Series DDS– 69-B, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/ dds-069-b/

. U.S. Geological Survey Western Gulf Province Assessment Team, 2006, Petroleum systems and geologic assessment of undiscovered oil and gas, Navarro and Taylor Groups, Western Gulf Province, Texas: U.S. Geological Survey Digital Data Series DDS–69-H, 4 chapters, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-h/

. U.S. Geological Survey Western Oregon and Washington Province Assessment Team, 2011, Geologic assessment of undiscovered hydrocarbon resources of the Western Oregon and Washington Province: U.S. Geological Survey Digital Data Series DDS–69–X, 4 chapters 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-x/

. 

## CD-ROMs Higley, D.K., compiler, 2007, Petroleum systems and assess

ment of undiscovered oil and gas in the Raton Basin–Sierra Grande Uplift Province, Colorado and New Mexico—USGS Province 41: U.S. Geological Survey Digital Data Series DDS–69–N, 141 p., 1 CD-ROM, http://pubs.usgs.gov/dds/ dds-069/dds-069-n/

. Higley, D.K., compiler, 2007, Petroleum systems and assessment of undiscovered oil and gas in the Denver Basin Province, Colorado, Kansas, Nebraska, South Dakota, and Wyoming— USGS Province 39: U.S. Geological Survey Digital Data Series DDS–69–P., 1 CD-ROM, http://pubs.usgs.gov/dds/ dds-069/dds-069-p/

. Roberts, S.B., compiler, 2008, Geologic assessment of undis

covered, technically recoverable coalbed-gas resources in Cretaceous and Tertiary rocks, North Slope and adjacent State waters, Alaska: U.S. Geological Survey Digital Data Series DDS–69–S, 4 chapters, 1 CD-ROM, http://pubs.usgs.gov/ dds/dds-069/dds-069-s/

. U.S. Geological Survey Bighorn Basin Assessment Team, 2010, Petroleum systems and geologic assessment of oil and gas in the Bighorn Basin Province, Wyoming and Montana: U.S. Geological Survey Digital Data Series DDS–69–V, 8 chapters, pages variable, 1 CD-ROM, http://pubs.usgs.gov/ dds/dds-069/dds-069-v/

. U.S. Geological Survey Black Warrior Basin Province Assess

ment Team, 2007, Geologic assessment of undiscovered oil and gas resources of the Black Warrior Basin Province, Alabama and Mississippi: U.S. Geological Survey Digital Data Series DDS-69-I, 5 chapters, 76 pages, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-i/

. U.S. Geological Survey Eastern Oregon and Washington Province Assessment Team, 2008, Geologic assessment of undiscovered gas resources of the Eastern Oregon and Wash

ington Province: U.S. Geological Survey Digital Data Series DDS–69-O, 5 chapters, 1 CD-ROM, http://pubs.usgs.gov/ dds/dds-069/dds-069-o/

. U.S. Geological Survey Hanna, Laramie, and Shirley Basins Province Assessment Team, 2007, Petroleum systems and geologic assessment of undiscovered oil and gas, Hanna, Laramie, and Shirley Basins Province, Wyoming and Colorado: U.S. Geological Survey Digital Data Series DDS–69–K, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/ dds-069-k/

.

### 28 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  U.S. Geological Survey Williston Basin Province Assess

ment Team, 2011, Assessment of undiscovered oil and gas resources of the Williston Basin Province of North Dakota, Montana, and South Dakota, 2010: U.S. Geological Survey Digital Data Series DDS–69–W, 7 chapters, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/dds-069-w/

. U.S. Geological Survey Wind River Basin Province Assess

ment Team, 2007, Petroleum systems and geologic assess

ment of oil and gas in the Wind River Basin Province, Wyoming: U.S. Geological Survey Digital Data Series DDS–69–J, 1 CD-ROM, http://pubs.usgs.gov/dds/dds-069/ dds-069-j/

. 

## Fact Sheets Anna, L.O., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2006, Assessment of undiscovered oil and gas resources of the Powder River Basin Province of Wyoming and Montana—2006 update: U.S. Geological Survey Fact Sheet 2006–3135, 2 p., http://pubs.usgs.gov/fs/2006/3135/

. Anna, L.O., Pollastro, R.M., Gaswirth, S.B., Lewan, M.D., Lillis, P.G., Roberts, L.N.R., Schenk, C.J., Charpentier, R.R., Cook, T.A., and Klett, T.R., 2008, Assessment of undiscovered oil and gas resources of the Williston Basin Province of North Dakota, Montana, and South Dakota, 2008: U.S. Geological Survey Fact Sheet 2008–3092, 2 p., http://pubs.usgs.gov/fs/2008/3092/

. Brownfield, M.E., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2009, Assessment of undiscovered hydrocarbon resources of the Western Oregon and Washington Province: U.S. Geological Survey Fact Sheet 2009–3060, 2 p., http://pubs.usgs.gov/fs/2009/3060/

. Brownfield, M.E., Tennyson, M.E., Ahlbrandt, T.S., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2006, Assessment of undiscovered gas resources of the Eastern Oregon and Washington Province, 2006: U.S. Geological Survey Fact Sheet 2006–3091, 2 p., http://pubs.usgs.gov/fs/2006/3091/

. Coleman, J.L., Milici, R.C., Cook, T.A., Charpentier, R.R.,

Kirschbaum, Mark, Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2011, Assessment of undiscovered oil and gas resources of the Devonian Marcellus Shale of the Appala

chian Basin Province, 2011: U.S. Geological Survey Fact Sheet 2011–3092, 2 p., http://pubs.usgs.gov/fs/2011/3092/

. Coleman, J.L., Swezey, C.S., Ryder, R.T., Charpentier, R.R.,

Milici, R.C., Hatch, J.R., Cook, T.A., Klett, T.R., Pollastro, R.M., Schenk, C.J., and Schmoker, J.W., 2006, Undiscov

ered oil and gas resources underlying the U.S. portions of the Great Lakes, 2005: U.S. Geological Survey Fact Sheet 2006–3049, 4 p., http://pubs.usgs.gov/fs/2006/3049/

. Dubiel, R.F., Pitman, J.K., Pearson, O.N., Pearson, Krystal, Kinney, S.A., Lewan, M.D., Burke, Lauri, Biewick, L.R.H., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2012, Assessment of undiscovered oil and gas resources in conventional and continuous petro

leum systems in the Upper Cretaceous Eagle Ford Group, U.S. Gulf Coast Region, 2011: U.S. Geological Survey Fact Sheet 2012–3003, 2 p., http://pubs.usgs.gov/fs/2012/3003/

. Dubiel, R.F., Pitman, J.K., Pearson, O.N., Warwick, P.D., Karlsen, A.W., Coleman, J.L., Hackley, P.C., Hayba, D.O., Swanson, S.M., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2007, Assessment of undiscovered oil and gas resources in Tertiary strata of the Gulf Coast, 2007: U.S. Geological Survey Fact Sheet 2007–3066, 4 p., http://pubs.usgs.gov/fs/2007/3066/

. Dubiel, R.F., Warwick, P.D., Swanson, Sharon, Burke, Lauri, Biewick, L.R.H., Charpentier, R.R., Coleman, J.L., Cook, T.A., Dennen, Kris, Doolan, Colin, Enomoto, Catherine, Hackley, P.C., Karlsen, A.W., Klett, T.R., Kinney, S.A., Lewan, M.D., Merrill, Matt, Pearson, Krystal, Pearson, O.N., Pitman, J.K., Pollastro, R.M., Rowan, E.L., Schenk, C.J., and Valentine, Brett, 2011, Assessment of undiscov

ered oil and gas resources in Jurassic and Cretaceous strata of the Gulf Coast, 2010: U.S. Geological Survey Fact Sheet 2011–3020, 4 p., http://pubs.usgs.gov/fs/2011/3020/

. Dyman, T.S., Condon, S.M., Ahlbrandt, T.S., Charpentier, R.R., Cook, T.A., Klett, T.R., Lewan, M.D., Lillis, P.G., Pawlewicz, M.J., Pollastro, R.M., and Schenk, C.J., 2006, 2005 assessment of undiscovered oil and gas resources in Hanna, Laramie, Shirley Basins Province, Wyoming: U.S. Geological Survey Fact Sheet 2005-3125, 2 p., http://pubs.usgs.gov/fs/2005/3125/

. Flores, R.M., Anna, L.O., Dolton, G.L., Fox, J.E., French, C.D., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2002, Assessment of undiscovered oil and gas resources of the Powder River Basin Province of Wyoming and Montana, 2002: U.S. Geo

logical Survey Fact Sheet 146–02, 2 p, http://pubs.usgs.gov/ fs/fs-146-02/

. Hatch, J.R., Pawlewicz, M.J., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2003, Assessment of undiscovered oil and gas resources of the Black Warrior Basin Province, 2002: U.S. Geologi

cal Survey Fact Sheet 038-03, 2 p., http://pubs.usgs.gov/fs/ fs-038-03/

. Higley, Debra, Charpentier, R.R., Cook, Troy, Klett, T.R., Pollastro, Richard, Schmoker, J.W., and Schenk, C.J., 2003, 2002 USGS assessment of oil and gas resource potential of the Denver Basin Province of Colorado, Kansas, Nebraska, South Dakota, and Wyoming: U.S. Geological Survey Fact Sheet 002–03, 4 p., http://pubs.usgs.gov/fs/fs-002-03/

.

### Appendix 1 **29** Higley, D.K., Cook, T.A., Pollastro, R.M., Charpentier, R.R., Klett, T.R., and Schenk, C.J., 2005, Assessment of undis

covered oil and gas resources of the Raton Basin–Sierra Grande Uplift Province of New Mexico and Colorado, 2004: U.S. Geological Survey Fact Sheet 2005–3027, 2 p., http://pubs.usgs.gov/fs/2005/3027/

. Higley, D.K., Gaswirth, S.B., Abbott, M.M., Charpentier, R.R., Cook, T.A., Ellis, G.S., Gianoutsos, N.J., Hatch, J.R., Klett, T.R., Nelson, Philip, Pawlewicz, M.J., Pearson, O.N., Pollastro, R.M., and Schenk, C.J., 2011, Assessment of undiscovered oil and gas resources of the Anadarko Basin Province of Oklahoma, Kansas, Texas, and Colorado, 2010: U.S. Geological Survey Fact Sheet 2011–3003, 2 p., http://pubs.usgs.gov/fs/2011/3003/

. Houseknecht, D.W., Coleman, J.L., Milici, R.C., Garrity, C.P., Rouse, W.A., Fulk, B.R., Paxton, S.T., Abbott, M.M., Mars, J.C., Cook, T.A., Schenk, C.J., Charpentier, R.R., Klett, T.R., Pollastro, R.M., and Ellis, G.S., 2010, Assessment of undiscovered natural gas resources of the Arkoma Basin Province and geologically related areas: U.S. Geological Survey Fact Sheet 2010–3043, 4 p., http://pubs.usgs.gov/ fs/2010/3043/

. Kirschbaum, M.A., Anna, Larry, Collett, T.S., Cook, Troy, Dubiel, R.F., Finn, T.M., Hettinger, R.D., Henry, Mitchell, Johnson, E.A., Johnson, R.C., Lillis, P.G., Nelson, P.H., Nuccio, V.F., Rice, C.A., Roberts, L.N.R., and Roberts, S.B., 2002, Assessment of undiscovered oil and gas resources of the Uinta-Piceance Province of Colorado and Utah, 2002: U.S. Geological Survey Fact Sheet 026–02, 2 p., http://pubs.usgs.gov/fs/fs-0026-02/

. Kirschbaum, M.A., Anna, Larry, Collett, T.S., Cook, Troy, Dubiel, R.F., Finn, T.M., Hettinger, R.D., Henry, Mitchell, Johnson, E.A., Johnson, R.C., Lillis, P.G., Nelson, P.H., Nuccio, V.F., Rice, C.A., Roberts, L.N.R., and Roberts, S.B., 2003, Assessment of undiscovered oil and gas resources of the Uinta-Piceance Province of Colorado and Utah, 2002: U.S. Geological Survey Fact Sheet 157–02, 2 p., http://pubs.usgs.gov/fs/fs-157-02/

. Kirschbaum, M.A., Charpentier, R.R., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2004, Assessment of undiscovered oil and gas resources of the Wyoming Thrust Belt Province, 2003: U.S. Geological Survey Fact Sheet 2004–3025, 2 p., http://pubs.usgs.gov/fs/2004/3025/

. Kirschbaum, M.A., Condon, S.M., Finn, T.M., Johnson, R.C., Lillis, P.G., Nelson, P.H., Roberts, L.N.R., Roberts, S.B., Charpentier, R.R., Cook, Troy, Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2008, Assessment of undiscovered oil and gas resources of the Bighorn Basin Province, Wyo

ming and Montana, 2008: U.S. Geological Survey Fact Sheet 2008–3050, 2 p., http://pubs.usgs.gov/fs/2008/3050/

. Kirschbaum, Mark, Finn, T.M., Hettinger, R.D., Johnson, E.A., Johnson, R.C., Kibler, Joyce, Lillis, P.G., Nelson, P.H., Roberts, L.N.R., Roberts, S.B., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2002, Assessment of undiscovered oil and gas resources of the Southwestern Wyoming Province, 2002: U.S. Geological Survey Fact Sheet 145–02, 2 p., http://pubs.usgs.gov/fs/fs-145-02/

. Kirschbaum, M.A., Finn, T.M., Johnson, R.C., Kibler, Joyce, Lillis, P.G., Nelson, P.H., Roberts, L.N.R., Roberts, S.B., Charpentier, R.R., Cook, Troy, Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2005, Assessment of undiscovered oil and gas resources of the Wind River Basin Province, 2005: U.S. Geological Survey Fact Sheet 2005–3141, 2 p., http://pubs.usgs.gov/fs/2005/3141/

. Milici, R.C., Coleman, J.L., Rowan, E.L., Cook, T.A., Charpentier, R.R., Kirschbaum, M.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2012, Assessment of undiscovered oil and gas resources of the East Coast Mesozoic basins of the Piedmont, Blue Ridge Thrust Belt, Atlantic Coastal Plain, and New England Provinces, 2011: U.S. Geological Survey Fact Sheet 2012–3075, 2 p., http://pubs.usgs.gov/ fs/2012/3075/

. Milici, R.C., and Hatch, J.R., 2004, Assessment of undis

covered Carboniferous coal-bed gas resources of the Appalachian Basin and Black Warrior Basin Provinces, 2002: U.S. Geological Survey Fact Sheet 2004–3092, 2 p., http://pubs.usgs.gov/fs/2004/3092/

. Milici, R.C., Ryder, R.T., Swezey, C.S., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2003, Assessment of undiscovered oil and gas resources of the Appalachian Basin Province, 2002: U.S. Geological Survey Fact Sheet 009–03, 2 p., http://pubs.usgs.gov/fs/fs-009-03/

. Pearson, Krystal, Dubiel, R.F., Pearson, O.N., Pitman, J.K., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2011, Assessment of undiscovered oil and gas resources of the Upper Cretaceous Austin Chalk and Tokio and Eutaw Formations, Gulf Coast, 2010: U.S. Geological Survey Fact Sheet 2011–3046, 2 p., http://pubs.usgs.gov/ fs/2011/3046/

. Pollastro, R.M., Cook, T.A., Roberts, L.N.R., Schenk, C.J., Lewan, M.D., Anna, L.O., Gaswirth, S.B., Lillis, P.G., Klett, T.R., and Charpentier, R.R., 2008, Assessment of undiscovered oil resources in the Devonian-Mississippian Bakken Forma

tion, Williston Basin Province, Montana and North Dakota, 2008: U.S. Geological Survey Fact Sheet 2008–3021, 2 p., http://pubs.usgs.gov/fs/2008/3021/

.

### 30 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**  Pollastro, R.M., Hill, R.J., Ahlbrandt, T.A., Charpentier, R.R., Cook, T.A., Klett, T.R., Henry, M.E., and Schenk, C.J., 2004, Assessment of undiscovered oil and gas resources of the Bend Arch-Fort Worth Basin Province of north-central Texas and southwestern Oklahoma, 2003: U.S. Geological Survey Fact Sheet 2004–3022, 2 p., http://pubs.usgs.gov/ fs/2004/3022/

. Ridgley, J.L., Anna, L.O., Condon, S.M., Fishman, N.S., Hester, T.C., Lillis, P.G., Rowan, E.L., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., and Schenk, C.J., 2008, Assessment of undiscovered biogenic gas resources, North-Central Montana Province: U.S. Geological Sur

vey Fact Sheet 2008–3036, 2 p., http://pubs.usgs.gov/ fs/2008/3036/

. Ridgley, J.L., Condon, S.M., Dubiel, R.F., Charpentier, R.R., Cook, T.A., Crovelli, R.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2002, Assessment of undiscovered oil and gas resources of the San Juan Basin Province of New Mexico and Colorado, 2002: U.S. Geological Survey Fact Sheet 147–02, 2 p., http://pubs.usgs.gov/fs/fs-147-02/

. Roberts, Steve, Barker, C.E., Bird, K.J., Charpentier, R.R., Cook, Troy, Houseknecht, D.W., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2006, Assessment of coalbed gas resources in Cretaceous and Tertiary rocks on the North Slope, Alaska, 2006: U.S. Geological Survey Fact Sheet 2006–3105, 2 p., http://pubs.usgs.gov/fs/2006/3105/

. Schenk, C.J., Charpentier, R.R., Cook, T.A., Dyman, T.S.,

French, C.D., Henry, M.E., Klett, T.R., Perry, W.J., Pol

lastro, R.M., and Potter, C.J., 2002, Assessment of undis

covered oil and gas resources of the Montana Thrust Belt Province, 2002: U.S. Geological Survey Fact Sheet 148–02, 2 p., http://pubs.usgs.gov/fs/fs-148-02/

. Schenk, C.J., Pollastro, R.M., Cook, T.A., Pawlewicz, M.J.,

Klett, T.R., Charpentier, R.R., and Cook, H.E., 2008, Assessment of undiscovered oil and gas resources of the Permian Basin Province of west Texas and southeast New Mexico, 2007: U.S. Geological Survey Fact Sheet 2007– 3115, 4 p., http://pubs.usgs.gov/fs/2007/3115/

. Stanley, R.G., Ahlbrandt, T.S., Charpentier, R.R., Cook, T.A., Crews, J.M., Klett, T.R.; Lillis, P.G., Morin, R.L., Phillips, J.D., Pollastro, R.M., Rowan, E.L., Saltus, R.W., Schenk, C.J., Simpson, M.K., Till, A.B., and Troutman, S.M., 2004, Oil and gas assessment of Yukon Flats, east-central Alaska, 2004: U.S. Geological Survey Fact Sheet 2004–3121, 2 p., http://pubs.usgs.gov/fs/2004/3121/

. Stanley, R.G., Charpentier, R.R., Cook, T.A., Houseknecht,

D.W., Klett, T.R., Lewis, K.A., Lillis, P.G., Nelson, P.H., Phillips, J.D., Pollastro, R.M., Potter, C.J., Rouse, W.A., Saltus, R.W., Schenk, C.J., Shah, A.K., and Valin, Z.C., 2011, Assessment of undiscovered oil and gas resources of the Cook Inlet region, south-central Alaska, 2011: U.S. Geological Survey Fact Sheet 2011–3068, 2 p., http://pubs.usgs.gov/fs/2011/3068/

. Swezey, C.S., Hatch, J.R., Brennan, S.T., East, J.A., Rowan,

E.L., Repetski, J.E., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2007, Assessment of undiscovered oil and gas resources of the Illinois Basin, 2007: U.S. Geological Survey Fact Sheet 2007–3058, 2 p., http://pubs.usgs.gov/fs/2007/3058/

. Swezey, C.S., Hatch, J.R., Hayba, D.O., Repetski, J.E.,

Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2005, Assessment of undiscovered oil and gas resources of the U.S. portion of the Michigan Basin, 2004: U.S. Geological Survey Fact Sheet 2005–3070, 2 p., http://pubs.usgs.gov/fs/2005/3070/

. Warwick, P.D., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., and Schenk, C.J., 2007, Assessment of undiscovered oil and gas resources in Cretaceous-Tertiary coal beds of the Gulf Coast Region, 2007: U.S. Geological Survey Fact Sheet 2007–3039, 2 p., http://pubs.usgs.gov/ fs/2007/3039/

. Whidden, K.J., Anna, L.O., Pearson, K.M., Lillis, P.G., Charpentier, R.R., Cook, T.A., Klett, T.R., Pollastro, R.M., Dubiel, R.F., and Schenk, C.J., 2012, Assessment of undiscovered oil and gas resources in the Paradox Basin Province, Utah, Colorado, New Mexico, and Arizona, 2011: U.S. Geological Survey Fact Sheet 2012–3031, 4 p., http://pubs.usgs.gov/fs/2012/3031/

.

### Appendix 2 **31** 

# Appendix 2. **Structure of the Files Presented in this Report**

Katz, B.J., and Liro, L.M., 1993, The Waltman Shale Member, Fort Union Formation, Wind River Basin—A Paleocene clastic lacustrine source system, in Keefer, W.R., Metzger, W.J., and Godwin, L.H., eds., Wyoming Geological Association Special Symposium on Oil and Gas and Other Resources of the Wind River Basin, Wyoming, 1993: Wyoming Geological Association, Casper, Wyoming, p. 163–174. 16. Notes from Assessor 2: additional explanatory notes. 17. AU Type: 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 assess

ment unit is characterized as being oil prone if the GOR is less than 20,000 cubic feet of gas per barrel of oil; otherwise, it is gas prone. 18. Minimum Total Recovery: 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. 19. Number of Tested Cells: number of tested cells in the assessment unit. 20. Number of Tested Cells > Minimum: number of tested cells in the assessment unit that have total recoveries equal to or larger than the specified minimum total recov

ery per cell. 21. Established: 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. 22. Frontier: assessment unit maturity, the exploration matu

rity of the assessment unit. Assessment unit maturity is classified as “frontier” if 1 to 24 cells exceed the mini

mum total recovery. 23. Hypothetical: assessment-unit maturity, the exploration maturity of the assessment unit. Assessment-unit maturity is classified as “hypothetical” if no cells exceed the mini

mum total recovery. 24. Exploration Maturity: assessment-unit maturity from columns 21 to 23. 25. Median of First Third: median total recovery per cell of the set of tested cells equal to or greater than the mini

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

ery 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. The Main Inputfile contains input data from the FORSPAN Assessment Model for Continuous Accumulations: Basic Input Data Form used in this assessment. There are records for 186 Assessment Units (AUs), 139 of which were quantitatively assessed. In the Microsoft Excel version of this file, AUs that were not quantitatively assessed are colored pur

ple; green cells mark major changes from previously published versions, as noted in the main text of this report. Blank cells represent no data. The Main Input file is designed to incorpo

rate data from several versions of the input form. Many of the triangular distributions were originally described using a median as input. This later changed to a mode as input. For comparison across these differences, calculated values of the median, mode, and mean are given for many of the distributions. These calcu

lated values would be either the variable value as entered on the input form (if given in that version) or a value calculated using the other parameters. This table contains 147 columns. Data columns are as follows: 1. AU Number: assessment unit code number. 2. AU: assessment unit name. 3. Version: version of assessment input form. 4. Reservoir Type: shale gas, coalbed gas, tight gas, or con

tinuous oil. 5. Assessment Geologist: assessing geologist’s name. 6. Date: date of assessment. 7. Region Number: region code number. 8. Region: region name. 9. Province Number: province code number. 10. Province: province name. 11. TPS Number: total petroleum system (TPS) code number. 12. TPS: total petroleum system name. 13. Based on Data 1: data sources used to aid in completing the data-input form. 14. Based on Data 2: data sources used to aid in completing the data-input form. 15. Notes from Assessor 1: additional explanatory notes. Two references cited in this column are: Jorjorian, Thomas, Liro, L.M., and Katz, B.J., 1989, Geochemical and well-log investigation of an actively generating source rock sequence—Waltman Shale, Wind River Basin, Wyoming [abs.]: American Association of Petroleum Geologists Bulletin, v. 73, no. 9, p. 1162.

### 32 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
26. Median of Second Third: median total recovery per cell of the set of tested cells equal to or greater than the mini

mum total recovery that constitute the second third of the total number of cells ranked according to date of discov

ery 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. 27. Median of Third Third: median total recovery per cell of the set of tested cells equal to or greater than the mini

mum total recovery that constitute the third third of the total number of cells ranked according to date of discov

ery 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. 28. Charge: 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. 29. Rocks: rocks probability, the probability for adequate res

ervoirs, 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. 30. Timing: 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. 31. AU Probability: geologic probability, the product of charge, rocks, and timing probabilities. Geologic prob

ability is given as a fractional value from 0 to 1.0. 32. Access: accessibility probability, the probability for adequate location for necessary petroleum-related 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. 33. AU Area-minimum: the estimated minimum (F100) area of the assessment unit. The area is given in acres. 34. AU Area-median: the estimated median (F50) area of the assessment unit, as written on the input form. The area is given in acres. 35. AU Area-calculated median: the estimated median (F50) area of the assessment unit, as calculated from the param

eters on the input form. The area is given in acres. 36. AU Area-mode: the estimated mode (most likely value) of the area of the assessment unit, as written on the input form. The area is given in acres. 37. AU Area-calculated mode: the estimated mode (most likely value) of the area of the assessment unit, as calcu

lated from the parameters on the input form. The area is given in acres. 38. AU Area-maximum: the estimated maximum (F0) area of the assessment unit. The area is given in acres. 39. AU Area-mean: the estimated mean area of the assessment unit, as written on the input form. The area is given in acres. 40. AU Area-calculated mean: the estimated mean area of the assessment unit, as calculated from the parameters on the input form. The area is given in acres. 41. Cell Area-minimum: 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. 42. Cell Area-median: the estimated median (F50) area per cell of untested cells having the potential for additions to reserves in the assessment unit, as written on the input form. This area is equivalent to the drainage area of wells. This area is given in acres. 43. Cell Area-calculated median: the estimated median (F50) area per cell of untested cells having the potential for addi

tions to reserves in the assessment unit, as calculated from the parameters on the input form. This area is equivalent to the drainage area of wells. This area is given in acres. 44. Cell Area-mode: the estimated mode (most likely value) of the area per cell of untested cells with potential for additions to reserves in the assessment unit, as written on the input form. This area is equivalent to the drainage area of wells. This area is given in acres. 45. Cell Area-calculated mode: the estimated mode (most likely value) of the area per cell of untested cells with potential for additions to reserves in the assessment unit, as calculated from the parameters on the input form. This area is equivalent to the drainage area of wells. This area is given in acres. 46. Cell Area-maximum: 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. 47. Cell Area-mean: the estimated mean area per cell of untested cells having the potential for additions to reserves in the assessment unit, as written on the input form. This area is equivalent to the drainage area of wells. This area is given in acres.

### Appendix 2 **33**
48. Cell Area-calculated mean: the estimated mean area per cell of untested cells having the potential for additions to reserves in the assessment unit, as calculated from the parameters on the input form. This area is equivalent to the drainage area of wells. This area is given in acres. 49. Cell Area-minimum of mean: the estimated minimum value of the distribution of uncertainty of the mean 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. 50. Cell Area-maximum of mean: the estimated maximum value of the distribution of uncertainty of the mean 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. 51. Untested %-minimum: estimated minimum (F100) per

centage of the total assessment-unit area that is untested. 52. Untested %-median: estimated median (F50) percentage of the total assessment-unit area that is untested, as writ

ten on the input form. 53. Untested %-calculated median: estimated median (F50) percentage of the total assessment-unit area that is untested, as calculated from the parameters on the input form. 54. Untested %-mode: estimated mode (most likely value) of the percentage of the total assessment-unit area that is untested, as written on the input form. 55. Untested %-calculated mode: estimated mode (most likely value) of the percentage of the total assessment-unit area that is untested, as calculated from the parameters on the input form. 56. Untested %-maximum: estimated maximum (F0) percent

age of the total assessment-unit area that is untested. 57. Untested %-mean: estimated mean percentage of the total assessment-unit area that is untested, as written on the input form. 58. Untested %-calculated mean: estimated mean percentage of the total assessment-unit area that is untested, as calcu

lated from the parameters on the input form. 59. Sweet Spot %-minimum: estimated minimum (F100) per

centage of the untested area in the assessment unit having the potential for additions to reserves. 60. Sweet Spot %-median: estimated median (F50) percent

age of the untested area in the assessment unit having the potential for additions to reserves, as written on the input form. 61. Sweet Spot %-calculated median: estimated median (F50) percentage of the untested area in the assessment unit hav

ing the potential for additions to reserves, as calculated from the parameters on the input form. 62. Sweet Spot %-mode: estimated mode (most likely value) of the percentage of the untested area in the assessment unit having the potential for additions to reserves, as writ

ten on the input form. 63. Sweet Spot %-calculated mode: estimated mode (most likely value) of the percentage of the untested area in the assessment unit having the potential for additions to reserves, as calculated from the parameters on the input form. 64. Sweet Spot %-maximum: estimated maximum (F0) per

centage of the untested area in the assessment unit having the potential for additions to reserves. 65. Sweet Spot %-mean: estimated mean percentage of the untested area in the assessment unit having the potential for additions to reserves, as written on the input form. 66. Sweet Spot %-calculated mean: estimated mean percent

age of the untested area in the assessment unit having the potential for additions to reserves, as calculated from the parameters on the input form. 67. Geologic Evidence: geologic rationale for distribution estimated for sweet spot percent. 68. Total Recovery per Cell-minimum: 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. 69. Total Recovery per Cell-median: 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. 70. Total Recovery per Cell-maximum: estimated maximum (F0) total recovery per cell for untested cells in the assess

ment 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. 71. Total Recovery per Cell-mean: estimated mean 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 assess

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

### 34 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
72. GOR-minimum: 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. 73. GOR-median: 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, as written on the input form. 74. GOR-calculated median: 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, as calcu

lated from the parameters on the input form. 75. GOR-mode: estimated mode (most likely value) of the 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, as written on the input form. 76. GOR-calculated mode: estimated mode (most likely value) of the 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, as calculated from the parameters on the input form. 77. GOR-maximum: 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. 78. NGLGR-minimum: estimated minimum (F100) natural gas liquids (NGL) to gas ratio (NGLGR), 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. 79. NGLGR-median: estimated median (F50) natural gas liquids (NGL) to gas ratio (NGLGR), 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, as written on the input form. 80. NGLGR-calculated median: estimated median (F50) natural gas liquids (NGL) to gas ratio (NGLGR), in bar

rels 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, as calculated from the parameters on the input form. 81. NGLGR-mode: estimated mode (most likely value) of the natural gas liquids (NGL) to gas ratio (NGLGR), 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, as written on the input form. 82. NGLGR-calculated mode: estimated mode (most likely value) of the natural gas liquids (NGL) to gas ratio (NGLGR), 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, as calculated from the parameters on the input form. 83. NGLGR-maximum: estimated maximum (F0) natural gas liquids (NGL) to gas ratio (NGLGR), 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. 84. LGR-minimum: 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. 85. LGR-median: 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, as written on the input form. 86. LGR-calculated median: 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, as calculated from the parameters on the input form. 87. LGR-mode: estimated mode (most likely value) of the 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, as written on the input form. 88. LGR-calculated mode: estimated mode (most likely value) of the 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, as calculated from the parameters on the input form. 89. LGR-maximum: 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. 90. API-minimum: estimated minimum (F100) API (American Petroleum Institute) gravity, in degrees, of oil in untested cells in oil assessment units. 91. API-median: estimated median (F50) API (American Petroleum Institute) gravity, in degrees, of oil in untested cells in oil assessment units.

### Appendix 2 **35**
92. API-mode: estimated mode (most likely value) of the API (American Petroleum Institute) gravity, in degrees, of oil in untested cells in oil assessment units. 93. API-maximum: estimated maximum (F0) API (American Petroleum Institute) gravity, in degrees, of oil in untested cells in oil assessment units. 94. Sulfur %-minimum: estimated minimum (F100) sulfur content, in percent, of oil in untested cells in oil assess

ment units. 95. Sulfur %-median: estimated median (F50) sulfur content, in percent, of oil in untested cells in oil assessment units. 96. Sulfur %-mode: estimated mode (most likely value) of the sulfur content, in percent, of oil in untested cells in oil assessment units. 97. Sulfur %-maximum: estimated maximum (F0) sulfur content, in percent, of oil in untested cells in oil assess

ment units. 98. (Oil) Water Depth-minimum: estimated minimum (F100) water depth, in meters, of oil in untested cells in oil assessment units (ocean, bays, or lakes; if applicable). 99. (Oil) Water Depth-median: estimated median (F50) water depth, in meters, of oil in untested cells in oil assessment units (ocean, bays, or lakes; if applicable). 100. (Oil) Water Depth-mode: estimated mode (most likely value) of the water depth, in meters, of oil in untested cells in oil assessment units (ocean, bays, or lakes; if applicable). 101. (Oil) Water Depth-maximum: estimated maximum (F0) water depth, in meters, of oil in untested cells in oil assessment units (ocean, bays, or lakes; if applicable). 102. (Oil) Drilling Depth-minimum: estimated minimum (F100) drilling depth, in meters, of oil in untested cells in oil assessment units. 103. (Oil) Drilling Depth-F75: estimated F75 drilling depth, in meters, of oil in untested cells in oil assessment units. An estimated 75 percent of the wells will be deeper than this value. 104. (Oil) Drilling Depth-median: estimated median (F50) drilling depth, in meters, of oil in untested cells in oil assessment units. 105. (Oil) Drilling Depth-mode: estimated mode (most likely value) of the drilling depth, in meters, of oil in untested cells in oil assessment units. 106. (Oil) Drilling Depth-F25: estimated F25 drilling depth, in meters, of oil in untested cells in oil assessment units. An estimated 25 percent of the wells will be deeper than this value. 107. (Oil) Drilling Depth-maximum: estimated maximum (F0) drilling depth, in meters, of oil in untested cells in oil assessment units. 108. Inert Gas %-minimum: estimated minimum (F100) inert gas content, in percent, of gas in untested cells in gas assessment units (nitrogen and helium, and so forth). 109. Inert Gas %-median: estimated median (F50) inert gas content, in percent, of gas in untested cells in gas assess

ment units (nitrogen and helium, and so forth). 110. Inert Gas %-mode: estimated mode (most likely value) of the inert gas content, in percent, of gas in untested cells in gas assessment units (nitrogen and helium, and so forth). 111. Inert Gas %-maximum: estimated maximum (F0) inert gas content, in percent, of gas in untested cells in gas assessment units (nitrogen and helium, and so forth). 112. CO2 %-minimum: estimated minimum (F100) carbon dioxide content, in percent, of gas in untested cells in gas assessment units. 113. CO2 %-median: estimated median (F50) carbon dioxide content, in percent, of gas in untested cells in gas assess

ment units. 114. CO2 %-mode: estimated mode (most likely value) of the carbon dioxide content, in percent, of gas in untested cells in gas assessment units. 115. CO2 %-maximum: estimated maximum (F0) carbon dioxide content, in percent, of gas in untested cells in gas assessment units. 116. H2S %-minimum: estimated minimum (F100) hydrogen sulfide content, in percent, of gas in untested cells in gas assessment units. 117. H2S %-median: estimated median (F50) hydrogen sulfide content, in percent, of gas in untested cells in gas assessment units. 118. H2S %-mode: estimated mode (most likely value) of the hydrogen sulfide content, in percent, of gas in untested cells in gas assessment units. 119. H2S %-maximum: estimated maximum (F0) hydrogen sulfide content, in percent, of gas in untested cells in gas assessment units. 120. BTU-minimum: estimated minimum (F100) heating value of gas, in BTU, of gas in untested cells in gas assessment units. 121. BTU-median: estimated median (F50) heating value of gas, in BTU, of gas in untested cells in gas assessment units.

### 36 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
122. BTU-mode: estimated mode (most likely value) of the heating value of gas, in BTU, of gas in untested cells in gas assessment units. 123. BTU-maximum: estimated maximum (F0) heating value of gas, in BTU, of gas in untested cells in gas assessment units. 124. (Gas) Water Depth-minimum: estimated minimum (F100) water depth, in meters, of gas in untested cells in gas assessment units (ocean, bays, or lakes; if applicable) 125. (Gas) Water Depth-median: estimated median (F50) water depth, in meters, of gas in untested cells in gas assessment units (ocean, bays, or lakes; if applicable). 126. (Gas) Water Depth-mode: estimated mode (most likely value) of the water depth, in meters, of gas in untested cells in gas assessment units (ocean, bays, or lakes; if applicable). 127. (Gas) Water Depth-maximum: estimated maximum (F0) water depth, in meters, of gas in untested cells in gas assessment units (ocean, bays, or lakes; if applicable). 128. (Gas) Drilling Depth-minimum: estimated minimum (F100) drilling depth, in meters, of gas in untested cells in gas assessment units. 129. (Gas) Drilling Depth-F75: estimated F75 drilling depth, in meters, of gas in untested cells in gas assessment units. An estimated 75 percent of the wells will be deeper than this value. 130. (Gas) Drilling Depth-median: estimated median (F50) drilling depth, in meters, of gas in untested cells in gas assessment units. 131. (Gas) Drilling Depth-mode: estimated mode (most likely value) of the drilling depth, in meters, of gas in untested cells in gas assessment units. 132. (Gas) Drilling Depth-F25: estimated F25 drilling depth, in meters, of gas in untested cells in gas assessment units. An estimated 25 percent of the wells will be deeper than this value. 133. (Gas) Drilling Depth-maximum: estimated maximum (F0) drilling depth, in meters, of gas in untested cells in gas assessment units. 134. Future Success Ratio-minimum: estimated minimum (F100) future success ratio, as percent. 135. Future Success Ratio-median: estimated median (F50) future success ratio, as percent, as written on the input form. 136. Future Success Ratio-calculated median: estimated median (F50) future success ratio, as percent, as calcu

lated from the parameters on the input form. 137. Future Success Ratio-mode: estimated mode (most likely value) of the future success ratio, as percent, as written on the input form. 138. Future Success Ratio-calculated mode: estimated mode (most likely value) of the future success ratio, as percent, as calculated from the parameters on the input form. 139. Future Success Ratio-maximum: estimated maximum (F100) future success ratio, as percent. 140. Future Success Ratio-mean: estimated mean future suc

cess ratio, as percent, as written on the input form. 141. Future Success Ratio-calculated mean: estimated mean future success ratio, as percent, as calculated from the parameters on the input form. 142. Historic Success Ratio: historical success ratio, as per

cent. 143. Completion 1: typical well-completion practices (con

ventional, open hole, open cavity, other). 144. Completion 2: fraction of wells drilled that are typically stimulated. 145. Completion 3: predominant type of stimulation (none, frac, acid, other). 146. Completion 4: fraction of wells drilled that are horizon

tal. 147. Program Version: which version of the ACCESS program (version 1, 2, or 3) was used to perform the calculations. The Ecosystem Allocations, Federal Land Allocations, Land Ownership Allocations, and State Allocations 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. Ecosystem allocation is based on the Bailey ecosystems ( http://www.fs.fed.us/rm/ecoregions/products/map-ecoregionsunited-states/ ). The land ownership (including Federal owner

ship) information has come from several sources over the period in which these assessments were conducted. Currently the U.S. Geological Survey (USGS) Protected Areas Database of the United States (PADUS) is used ( http://gis1.usgs.gov/arcgis/ rest/services/gap/PADUS_Owner/MapServer ), but previously land-ownership data came primarily from Bureau of Land Management state offices. The Ecosystem Allocations file contains 65 columns. There are records for 186 AUs, 139 of which were quanti

tatively assessed. In the Microsoft Excel version of this file, AUs that were not quantitatively assessed are colored purple; green cells mark major changes from previously published versions, as noted in the main text of this report. The sum of the percentages should equal those for the total area (exclud

ing offshore) in the Land Ownership Allocations file. Data columns for these files are as follows:

### Appendix 2 **37**
1. AU Number: assessment-unit code number. 2. AU: assessment-unit name. 3. Province Number: province code number. 4. Province: province name. 5. Area: area of the assessment unit in square kilometers. 6. Ecosystem 1 Name: name of first ecosystem that occupies all or part of the assessment-unit area. 7. Ecosystem 1 Area %: percentage of assessment-unit area that is occupied by ecosystem 1. 8. Ecosystem 1 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 1. 9. Ecosystem 1 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 1. 10. Ecosystem 2 Name: name of second ecosystem that occu

pies part of the assessment-unit area. 11. Ecosystem 2 Area %: percentage of assessment-unit area that is occupied by ecosystem 2. 12. Ecosystem 2 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 2. 13. Ecosystem 2 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 2. 14. Ecosystem 3 Name: name of third ecosystem that occu

pies part of the assessment-unit area. 15. Ecosystem 3 Area %: percentage of assessment-unit area that is occupied by ecosystem 3. 16. Ecosystem 3 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 3. 17. Ecosystem 3 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 3. 18. Ecosystem 4 Name: name of fourth ecosystem that occu

pies part of the assessment-unit area. 19. Ecosystem 4 Area %: percentage of assessment-unit area that is occupied by ecosystem 4. 20. Ecosystem 4 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 4. 21. Ecosystem 4 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 4. 22. Ecosystem 5 Name: name of fifth ecosystem that occupies part of the assessment-unit area. 23. Ecosystem 5 Area %: percentage of assessment-unit area that is occupied by ecosystem 5. 24. Ecosystem 5 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 5. 25. Ecosystem 5 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 5. 26. Ecosystem 6 Name: name of sixth ecosystem that occu

pies part of the assessment-unit area. 27. Ecosystem 6 Area %: percentage of assessment-unit area that is occupied by ecosystem 6. 28. Ecosystem 6 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 6. 29. Ecosystem 6 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 6. 30. Ecosystem 7 Name: name of seventh ecosystem that occupies part of the assessment-unit area. 31. Ecosystem 7 Area %: percentage of assessment-unit area that is occupied by ecosystem 7. 32. Ecosystem 7 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 7. 33. Ecosystem 7 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 7. 34. Ecosystem 8 Name: name of eighth ecosystem that occu

pies part of the assessment-unit area. 35. Ecosystem 8 Area %: percentage of assessment-unit area that is occupied by ecosystem 8. 36. Ecosystem 8 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 8. 37. Ecosystem 8 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 8. 38. Ecosystem 9 Name: name of ninth ecosystem that occu

pies part of the assessment-unit area. 39. Ecosystem 9 Area %: percentage of assessment-unit area that is occupied by ecosystem 9. 40. Ecosystem 9 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 9. 41. Ecosystem 9 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 9. 42. Ecosystem 10 Name: name of tenth ecosystem that occu

pies part of the assessment-unit area. 43. Ecosystem 10 Area %: percentage of assessment-unit area that is occupied by ecosystem 10. 44. Ecosystem 10 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 10.

### 38 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
45. Ecosystem 10 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 10. 46. Ecosystem 11 Name: name of eleventh ecosystem that occupies part of the assessment-unit area. 47. Ecosystem 11 Area %: percentage of assessment-unit area that is occupied by ecosystem 11. 48. Ecosystem 11 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 11. 49. Ecosystem 11 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 11. 50. Ecosystem 12 Name: name of twelfth ecosystem that occupies part of the assessment-unit area. 51. Ecosystem 12 Area %: percentage of assessment-unit area that is occupied by ecosystem 12. 52. Ecosystem 12 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 12. 53. Ecosystem 12 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 12. 54. Ecosystem 13 Name: name of thirteenth ecosystem that occupies part of the assessment-unit area. 55. Ecosystem 13 Area %: percentage of assessment-unit area that is occupied by ecosystem 13. 56. Ecosystem 13 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 13. 57. Ecosystem 13 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 13. 58. Ecosystem 14 Name: name of fourteenth ecosystem that occupies part of the assessment-unit area. 59. Ecosystem 14 Area %: percentage of assessment-unit area that is occupied by ecosystem 14. 60. Ecosystem 14 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 14. 61. Ecosystem 14 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 14. 62. Ecosystem 15 Name: name of fifteenth ecosystem that occupies part of the assessment-unit area. 63. Ecosystem 15 Area %: percentage of assessment-unit area that is occupied by ecosystem 15. 64. Ecosystem 15 Oil Volume %: estimated percentage of undiscovered oil volume allocated to ecosystem 15. 65. Ecosystem 15 Gas Volume %: estimated percentage of undiscovered gas volume allocated to ecosystem 15. The Federal Land Allocations file contains 85 columns. There are records for 186 AUs, 139 of which were quantita

tively assessed. In the Microsoft Excel version of this file, AUs that were not quantitatively assessed are colored purple; green cells mark major changes from previously published ver

sions, as noted in the main text of this report. The sum of the percentages should equal those for Federal lands in the Land Ownership Allocations file. Data columns for these files are: 1. AU Number: assessment-unit code number. 2. AU: assessment-unit name. 3. Province Number: province code number. 4. Province: province name. 5. Area: area of the assessment unit in square kilometers. 6. BLM: “Bureau of Land Management (BLM),” name ofFederal land that occupies all or part of the assessmentunit area. 7. BLM Area %: percentage of assessment-unit area that is occupied by Bureau of Land Management lands. 8. BLM Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Bureau of Land Management lands. 9. BLM Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to Bureau of Land Manage

ment lands. 10. BLMW: “BLM Wilderness Areas (BLMW),” name ofFederal land that occupies all or part of the assessmentunit area. 11. BLMW Area %: percentage of assessment-unit area that is occupied by Bureau of Land Management Wilderness Areas. 12. BLMW Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Bureau of Land Management Wilderness Areas. 13. BLMW Gas Volume %: estimated percentage of undis

covered gas volume allocated to Bureau of Land Manage

ment Wilderness Areas. 14. BLMR: “BLM Roadless Areas (BLMR),” name of Fed

eral land that occupies all or part of the assessment-unit area. 15. BLMR Area %: percentage of assessment-unit area that is occupied by Bureau of Land Management Roadless Areas. 16. BLMR Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Bureau of Land Management Roadless Areas.

### Appendix 2 **39**
17. BLMR Gas Volume %: estimated percentage of undis

covered gas volume allocated to Bureau of Land Manage

ment Roadless Areas. 18. NPS: “National Park Service (NPS),” name of Federal land that occupies all or part of the assessment-unit area. 19. NPS Area %: percentage of assessment-unit area that is occupied by National Park Service lands. 20. NPS Oil Volume %: estimated percentage of undiscovered oil volume allocated to National Park Service lands. 21. NPS Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to National Park Service lands. 22. NPSW: “NPS Wilderness Areas (NPSW),” name of Fed

eral land that occupies all or part of the assessment-unit area. 23. NPSW Area %: percentage of assessment-unit area that is occupied by National Park Service Wilderness Areas. 24. NPSW Oil Volume %: estimated percentage of undis

covered oil volume allocated to National Park Service Wilderness Areas. 25. NPSW Gas Volume %: estimated percentage of undis

covered gas volume allocated to National Park Service Wilderness Areas. 26. NPSP: “NPS Withdrawals (NPSP),” name of Federal land that occupies all or part of the assessment-unit area. 27. NPSP Area %: percentage of assessment-unit area that is occupied by National Park Service Withdrawals. 28. NPSP Oil Volume %: estimated percentage of undis

covered oil volume allocated to National Park Service Withdrawals. 29. NPSP Gas Volume %: estimated percentage of undis

covered gas volume allocated to National Park Service Withdrawals. 30. FS: “Forest Service (FS),” name of Federal land that occupies all or part of the assessment-unit area. 31. FS Area %: percentage of assessment-unit area that is occupied by USDA Forest Service lands. 32. FS Oil Volume %: estimated percentage of undiscovered oil volume allocated to USDA Forest Service lands. 33. FS Gas Volume %: estimated percentage of undiscovered gas volume allocated to USDA Forest Service lands. 34. FSW: “FS Wilderness Areas (FSW),” name of Federal land that occupies all or part of the assessment-unit area. 35. FSW Area %: percentage of assessment-unit area that is occupied by USDA Forest Service Wilderness Areas. 36. FSW Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to USDA Forest Service Wilder

ness Areas. 37. FSW Gas Volume %: estimated percentage of undis

covered gas volume allocated to USDA Forest Service Wilderness Areas. 38. FSR: “FS Roadless Areas (FSR),” name of Federal land that occupies all or part of the assessment-unit area. 39. FSR Area %: percentage of assessment-unit area that is occupied by USDA Forest Service Roadless Areas. 40. FSR Oil Volume %: estimated percentage of undiscovered oil volume allocated to USDA Forest Service Roadless Areas. 41. FSR Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to USDA Forest Service Road

less Areas. 42. FSP: “FS Protected Withdrawals (FSP),” name of Federal land that occupies all or part of the assessment-unit area. 43. FSP Area %: percentage of assessment-unit area that is occupied by USDA Forest Service Protected Withdrawals. 44. FSP Oil Volume %: estimated percentage of undiscovered oil volume allocated to USDA Forest Service Protected Withdrawals. 45. FSP Gas Volume %: estimated percentage of undis

covered gas volume allocated to USDA Forest Service Protected Withdrawals. 46. FWS: “U.S. Fish and Wildlife Service (USFWS),” nameof Federal land that occupies all or part of the assessmentunit area. 47. FWS Area %: percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service lands. 48. FWS Oil Volume %: estimated percentage of undis

covered oil volume allocated to U.S. Fish and Wildlife Service lands. 49. FWS Gas Volume %: estimated percentage of undis

covered gas volume allocated to U.S. Fish and Wildlife Service lands. 50. FWSW: “USFWS Wilderness Areas (USFWSW),” nameof Federal land that occupies all or part of the assessmentunit area. 51. FWSW Area %: percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service Wilderness Areas.

### 40 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
52. FWSW Oil Volume %: estimated percentage of undis

covered oil volume allocated to U.S. Fish and Wildlife Service Wilderness Areas. 53. FWSW Gas Volume %: estimated percentage of undis

covered gas volume allocated to U.S. Fish and Wildlife Service Wilderness Areas. 54. FWSP: “USFWS Protected Withdrawals (USFWSP),” name of Federal land that occupies all or part of the assessment-unit area. 55. FWSP Area %: percentage of assessment-unit area that is occupied by U.S. Fish and Wildlife Service Protected Withdrawals. 56. FWSP Oil Volume %: estimated percentage of undis

covered oil volume allocated to U.S. Fish and Wildlife Service Protected Withdrawals. 57. FWSP Gas Volume %: estimated percentage of undis

covered gas volume allocated to U.S. Fish and Wildlife Service Protected Withdrawals. 58. WS: “Wilderness Study Areas (WS),” name of Federal land that occupies all or part of the assessment-unit area. 59. WS Area %: percentage of assessment-unit area that is occupied by Wilderness Study Areas. 60. WS Oil Volume %: estimated percentage of undiscovered oil volume allocated to Wilderness Study Areas. 61. WS Gas Volume %: estimated percentage of undiscovered gas volume allocated to Wilderness Study Areas. 62. DOE: “Department of Energy (DOE),” name of Federal land that occupies all or part of the assessment-unit area. 63. DOE Area %: percentage of assessment-unit area that is occupied by Department of Energy lands. 64. DOE Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Department of Energy lands. 65. DOE Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to Department of Energy lands. 66. DOD: “Department of Defense (DOD),” name of Federal land that occupies all or part of the assessment-unit area. 67. DOD Area %: percentage of assessment-unit area that is occupied by Department of Defense lands. 68. DOD Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Department of Defense lands. 69. DOD Gas Volume %: estimated percentage of undis

covered gas volume allocated to Department of Defense lands. 70. BOR: “Bureau of Reclamation (BOR),” name of Federal land that occupies all or part of the assessment-unit area. 71. BOR Area %: percentage of assessment-unit area that is occupied by Bureau of Reclamation lands. 72. BOR Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Bureau of Reclamation lands. 73. BOR Gas Volume %: estimated percentage of undis

covered gas volume allocated to Bureau of Reclamation lands. 74. TVA: “Tennessee Valley Authority (TVA),” name of Federal land that occupies all or part of the assessment-unit area. 75. TVA Area %: percentage of assessment-unit area that is occupied by Tennessee Valley Authority lands. 76. TVA Oil Volume %: estimated percentage of undiscovered oil volume allocated to Tennessee Valley Authority lands. 77. TVA Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to Tennessee Valley Authority lands. 78. Other: “Other Federal,” other unspecified Federal lands that occupy all part of the assessment-unit area. 79. Other Area %: percentage of assessment-unit area that is occupied by other unspecified Federal lands. 80. Other Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to other unspecified Federal lands. 81. Other Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to other unspecified Federal lands. 82. Fed 20: name of additional specified Federal lands that occupy all or part of the assessment-unit area. 83. Fed 20 Area %: percentage of assessment-unit area that is occupied by additional specified Federal lands. 84. Fed 20 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to additional specified Federal lands. 85. Fed 20 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to additional specified Federal lands. The Land Ownership Allocations file contains 57 columns. There are records for 186 AUs, 139 of which were quantitatively assessed. In the Microsoft Excel version of this file, AUs that were not quantitatively assessed are colored purple; green cells mark major changes from previously pub

lished versions, as noted in the main text of this report. The sum of the percentages should equal 100. Data columns for these files are as follows:

### Appendix 2 **41**
1. AU Number: assessment-unit code number. 2. AU: assessment-unit name. 3. Province Number: province code number. 4. Province: province name. 5. Area: area of the assessment unit in square kilometers. 6. Federal: “Federal Lands,” all Federal lands that occupy all or part of the assessment-unit area. 7. Federal Area %: percentage of assessment-unit area that is occupied by Federal lands. 8. Federal Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to Federal lands. 9. Federal Gas Volume %: estimated percentage of undis

covered gas volume allocated to Federal lands. 10. Private: “Private Lands,” all private lands that occupy all or part of the assessment-unit area. 11. Private Area %: percentage of assessment-unit area that is occupied by private lands. 12. Private Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to private lands. 13. Private Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to private lands. 14. Tribal: “Tribal Lands,” all tribal lands that occupy all or part of the assessment-unit area. 15. Tribal Area %: percentage of assessment-unit area that is occupied by tribal lands. 16. Tribal Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to tribal lands. 17. Tribal Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to tribal lands. 18. Other: name of other unspecified lands or offshore areas that occupy all or part of the assessment-unit area. 19. Other Area %: percentage of assessment-unit area that is occupied by other unspecified lands or offshore areas. 20. Other Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to other unspecified lands or offshore areas. 21. Other Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to other unspecified lands or offshore areas. 22. State 1: name of first State category which State-owned lands or waters occupy all or part of the assessment-unit area. 23. State 1 Area %: percentage of assessment-unit area that is occupied by State 1-owned lands or waters. 24. State 1 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 1-owned lands or waters. 25. State 1 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 1-owned lands or waters. 26. State 2: name of second State category which Stateowned lands or waters occupy all or part of the assess

ment-unit area. 27. State 2 Area %: percentage of assessment-unit area that is occupied by State 2-owned lands or waters. 28. State 2 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 2-owned lands or waters. 29. State 2 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 2-owned lands or waters. 30. State 3: name of third State category which State-owned lands or waters occupy all or part of the assessment-unit area. 31. State 3 Area %: percentage of assessment-unit area that is occupied by State 3-owned lands or waters. 32. State 3 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 3-owned lands or waters. 33. State 3 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 3-owned lands or waters. 34. State 4: name of fourth State category which State-owned lands or waters occupy all or part of the assessment-unit area. 35. State 4 Area %: percentage of assessment-unit area that is occupied by State 4-owned lands or waters. 36. State 4 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 4-owned lands or waters. 37. State 4 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 4-owned lands or waters. 38. State 5: name of fifth State category which State-owned lands or waters occupy all or part of the assessment-unit area.

### 42 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
39. State 5 Area %: percentage of assessment-unit area that is occupied by State 5-owned lands or waters. 40. State 5 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 5-owned lands or waters. 41. State 5 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 5-owned lands or waters. 42. State 6: name of sixth State category which State-owned lands or waters occupy all or part of the assessment-unit area. 43. State 6 Area %: percentage of assessment-unit area that is occupied by State 6-owned lands or waters. 44. State 6 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 6-owned lands or waters. 45. State 6 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 6-owned lands or waters. 46. State 7: name of seventh State category which Stateowned lands or waters occupy all or part of the assess

ment-unit area. 47. State 7 Area %: percentage of assessment-unit area that is occupied by State 7-owned lands or waters. 48. State 7 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 7-owned lands or waters. 49. State 7 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 7-owned lands or waters. 50. State 8: name of eighth State category which State-owned lands or waters occupy all or part of the assessment-unit area. 51. State 8 Area %: percentage of assessment-unit area that is occupied by State 8-owned lands or waters. 52. State 8 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 8-owned lands or waters. 53. State 8 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 8-owned lands or waters. 54. State 9: name of ninth State category which State-owned lands or waters occupy all or part of the assessment-unit area. 55. State 9 Area %: percentage of assessment-unit area that is occupied by State 9-owned lands or waters. 56. State 9 Oil Volume %: estimated percentage of undis

covered oil volume allocated to State 9-owned lands or waters. 57. State 9 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 9-owned lands or waters. The State Allocations file contains 53 columns. There are records for 186 AUs, 139 of which were quantitatively assessed. In the Microsoft Excel version of this file, AUs that were not quantitatively assessed are colored purple; green cells mark major changes from previously published ver

sions, as noted in the main text of this report. The sum of the percentages should equal 100. Data columns for these files are as follows: 1. AU Number: assessment-unit code number. 2. AU: assessment-unit name. 3. Province Number: province code number. 4. Province: province name. 5. Area: area of the assessment unit in square kilometers. 6. State 1 Name: name of first State (onshore and offshore) that occupies all or part of the assessment-unit area. 7. State 1 Area %: percentage of assessment-unit area that is occupied by State 1. 8. State 1 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 1. 9. State 1 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 1. 10. State 2 Name: name of second State (onshore and off

shore) that occupies part of the assessment-unit area. 11. State 2 Area %: percentage of assessment-unit area that is occupied by State 2. 12. State 2 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 2. 13. State 2 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 2. 14. State 3 Name: name of third State (onshore and offshore) that occupies part of the assessment-unit area. 15. State 3 Area %: percentage of assessment-unit area that is occupied by State 3. 16. State 3 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 3. 17. State 3 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 3.

### Appendix 2 **43**
18. State 4 Name: name of fourth State (onshore and off

shore) that occupies part of the assessment-unit area. 19. State 4 Area %: percentage of assessment-unit area that is occupied by State 4. 20. State 4 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 4. 21. State 4 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 4. 22. State 5 Name: name of fifth State (onshore and offshore) that occupies part of the assessment-unit area. 23. State 5 Area %: percentage of assessment-unit area that is occupied by State 5. 24. State 5 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 5. 25. State 5 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 5. 26. State 6 Name: name of sixth State (onshore and offshore) that occupies part of the assessment-unit area. 27. State 6 Area %: percentage of assessment-unit area that is occupied by State 6. 28. State 6 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 6. 29. State 6 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 6. 30. State 7 Name: name of seventh State (onshore and off

shore) that occupies part of the assessment-unit area. 31. State 7 Area %: percentage of assessment-unit area that is occupied by State 7. 32. State 7 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 7. 33. State 7 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 7. 34. State 8 Name: name of eighth State (onshore and off

shore) that occupies part of the assessment-unit area. 35. State 8 Area %: percentage of assessment-unit area that is occupied by State 8. 36. State 8 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 8. 37. State 8 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 8. 38. State 9 Name: name of ninth State (onshore and offshore) that occupies part of the assessment-unit area. 39. State 9 Area %: percentage of assessment-unit area that is occupied by State 9. 40. State 9 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 9. 41. State 9 Gas Volume %: estimated percentage of undiscov

ered gas volume allocated to State 9. 42. State 10 Name: name of tenth State (onshore and off

shore) that occupies part of the assessment-unit area. 43. State 10 Area %: percentage of assessment-unit area that is occupied by State 10. 44. State 10 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 10. 45. State 10 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 10. 46. State 11 Name: name of eleventh State (onshore and off

shore) that occupies part of the assessment-unit area. 47. State 11 Area %: percentage of assessment-unit area that is occupied by State 11. 48. State 11 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 11. 49. State 11 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 11. 50. State 12 Name: name of twelfth State (onshore and off

shore) that occupies part of the assessment-unit area. 51. State 12 Area %: percentage of assessment-unit area that is occupied by State 12. 52. State 12 Oil Volume %: estimated percentage of undiscov

ered oil volume allocated to State 12. 53. State 12 Gas Volume %: estimated percentage of undis

covered gas volume allocated to State 12. The Continuous Results file contains 49 columns. There are records for the 139 AUs that were quantitatively assessed. Data columns for these files are as follows: 1. AU Number: USGS assessment-unit code number. 2. AU: USGS assessment unit name 3. Province Number: province code number. 4. Province: province name. 5. AU Type: 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 assess

ment unit is characterized as being oil prone if the gas-tooil ratio (GOR) is less than 20,000 cubic feet of gas per barrel of oil; otherwise, it is gas prone.

### 44 **U .S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011** 
6. Date: date of assessment. 7. AU Probability: the probability that there exists the potential for at least one well equal to or larger than the minimum well size somewhere in the assessment unit. Assessment unit probability is given as a fractional value from 0 to 1.0. 8. Oil in Oil Deposit (MMBO), Mean: the estimated mean (average) value of undrilled oil in the assessment unit. The volume is given in millions of barrels of oil (MMBO). 9. Oil in Oil Deposit (MMBO), Std. Dev.: the estimated standard deviation of the distribution of undrilled oil in the assessment unit. The volume is given in millions of barrels of oil (MMBO). 10. Oil in Oil Deposit (MMBO), F95: the estimated value of undrilled oil 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). 11. Oil in Oil Deposit (MMBO), F75: the estimated value of undrilled oil such that there is a 75 percent probability that this amount or more exists in the assessment unit. The volume is given in millions of barrels of oil (MMBO). 12. Oil in Oil Deposit (MMBO), F50: the estimated value of undrilled oil 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). 13. Oil in Oil Deposit (MMBO), F25: the estimated value of undrilled oil such that there is a 25 percent probability that this amount or more exists in the assessment unit. The volume is given in millions of barrels of oil (MMBO). 14. Oil in Oil Deposit (MMBO), F5: the estimated value of undrilled oil 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). 15. Gas in Oil Deposit (BCFG), Mean: the estimated mean (average) value of undrilled associated/dissolved gas in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 16. Gas in Oil Deposit (BCFG), Std. Dev.: the estimated stan

dard deviation of the distribution of undrilled associated/ dissolved gas in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 17. Gas in Oil Deposit (BCFG), F95: the estimated value of undrilled associated/dissolved gas 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). 18. Gas in Oil Deposit (BCFG), F75: the estimated value of undrilled associated/dissolved gas such that there is a 75 percent probability that this amount or more exists in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 19. Gas in Oil Deposit (BCFG), F50: the estimated value of undrilled associated/dissolved gas 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). 20. Gas in Oil Deposit (BCFG), F25: the estimated value of undrilled associated/dissolved gas such that there is a 25 percent probability that this amount or more exists in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 21. Gas in Oil Deposit (BCFG), F5: the estimated value of undrilled associated/dissolved gas 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). 22. NGL in Oil Deposit (MMBNGL), Mean: the estimated mean (average) value of undrilled NGL in the assessment unit. The volume is given in millions of barrels of NGL (MMBNGL). 23. NGL in Oil Deposit (MMBNGL), Std. Dev.: the estimated standard deviation of the distribution of undrilled NGL in the assessment unit. The volume is given in millions of barrels of NGL (MMBNGL). 24. NGL in Oil Deposit (MMBNGL), F95: the estimated value of undrilled NGL such that there is a 95 percent probability that this amount or more exists in the assess

ment unit. The volume is given in millions of barrels of NGL (MMBNGL). 25. NGL in Oil Deposit (MMBNGL), F75: the estimated value of undrilled NGL such that there is a 75 percent probability that this amount or more exists in the assess

ment unit. The volume is given in millions of barrels of NGL (MMBNGL). 26. NGL in Oil Deposit (MMBNGL), F50: the estimated value of undrilled NGL such that there is a 50 percent probability that this amount or more exists in the assess

ment unit. This is the median value. The volume is given in millions of barrels of NGL (MMBNGL). 27. NGL in Oil Deposit (MMBNGL), F25: the estimated value of undrilled NGL such that there is a 25 percent probability that this amount or more exists in the assess

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

### Appendix 2 **45**
28. NGL in Oil Deposit (MMBNGL), F5: the estimated value of undrilled NGL such that there is a 5 percent prob

ability that this amount or more exists in the assessment unit. The volume is given in millions of barrels of NGL (MMBNGL). 29. Gas in Gas Deposit (BCFG), Mean: the estimated mean (average) value of undrilled nonassociated gas in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 30. Gas in Gas Deposit (BCFG), Std. Dev.: the estimated standard deviation of the distribution of undrilled nonas

sociated gas in the assessment unit. The volume is given in billions of cubic feet of gas (BCFG). 31. Gas in Gas Deposit (BCFG), F95: the estimated value of undrilled nonassociated gas such that there is a 95 percent probability that this amount or more exists in the assess

ment unit. The volume is given in billions of cubic feet of gas (BCFG). 32. Gas in Gas Deposit (BCFG), F75: the estimated value of undrilled nonassociated gas such that there is a 75 percent probability that this amount or more exists in the assess

ment unit. The volume is given in billions of cubic feet of gas (BCFG). 33. Gas in Gas Deposit (BCFG), F50: the estimated value of undrilled nonassociated gas such that there is a 50 percent probability that this amount or more exists in the assess

ment unit. This is the median value. The volume is given in billions of cubic feet of gas (BCFG). 34. Gas in Gas Deposit (BCFG), F25: the estimated value of undrilled nonassociated gas such that there is a 25 percent probability that this amount or more exists in the assess

ment unit. The volume is given in billions of cubic feet of gas (BCFG). 35. Gas in Gas Deposit (BCFG), F5: the estimated value of undrilled nonassociated gas such that there is a 5 percent probability that this amount or more exists in the assess

ment unit. The volume is given in billions of cubic feet of gas (BCFG). 36. Liquids in Gas Deposit (MMBL), Mean: the estimated mean (average) value of undrilled liquids in the assess

ment unit. The volume is given in millions of barrels of liquids (MMBL). 37. Liquids in Gas Deposit (MMBL), Std. Dev.: the estimated standard deviation of the distribution of undrilled liquids in the assessment unit. The volume is given in millions of barrels of liquids (MMBL). 38. Liquids in Gas Deposit (MMBL), F95: the estimated value of undrilled liquids such that there is a 95 percent probability that this amount or more exists in the assess

ment unit. The volume is given in millions of barrels of liquids (MMBL). 39. Liquids in Gas Deposit (MMBL), F75: the estimated value of undrilled liquids such that there is a 75 percent probability that this amount or more exists in the assess

ment unit. The volume is given in millions of barrels of liquids (MMBL). 40. Liquids in Gas Deposit (MMBL), F50: the estimated value of undrilled liquids such that there is a 50 percent probability that this amount or more exists in the assess

ment unit. This is the median value. The volume is given in millions of barrels of liquids (MMBL). 41. Liquids in Gas Deposit (MMBL), F25: the estimated value of undrilled liquids such that there is a 25 percent probability that this amount or more exists in the assess

ment unit. The volume is given in millions of barrels of liquids (MMBL). 42. Liquids in Gas Deposit (MMBL), F5: the estimated value of undrilled liquids such that there is a 5 percent prob

ability that this amount or more exists in the assessment unit. The volume is given in millions of barrels of liquids (MMBL). 43. Number of Cells, Mean: the estimated mean (average) value of number of untested cells with resource potential in the assessment unit. 44. Number of Cells, Std. Dev.: the estimated standard devia

tion of the distribution of number of untested cells with resource potential in the assessment unit. 45. Number of Cells, F95: the estimated value of number of untested cells with resource potential such that there is a 95 percent probability that this amount or more exists in the assessment unit. 46. Number of Cells, F75: the estimated value of number of untested cells with resource potential such that there is a 75 percent probability that this amount or more exists in the assessment unit. 47. Number of Cells, F50: the estimated value of number of untested cells with resource potential such that there is a 50 percent probability that this amount or more exists in the assessment unit. This is the median value. 48. Number of Cells, F25: the estimated value of number of untested cells with resource potential such that there is a 25 percent probability that this amount or more exists in the assessment unit. 49. Number of Cells, F5: the estimated value of number of untested cells with resource potential such that there is a 5 percent probability that this amount or more exists in the assessment unit.

### 46 **U.S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011**
The Code List file contains the USGS numeric codes for provinces (4 digits), total petroleum systems (6 digits), and assessment units (8 digits). Codes for ecosystem names are in the Ecosystem Codes file. This table contains 3 columns. Data columns are as follows: 1. Code: USGS code number 2. Name: USGS area name 3. Name, Unit, and Code: the USGS area name, comma, space, the hierarchical unit name (province, total petro

leum system, or assessment unit), and the USGS code number The Ecosystem Codes file contains the USGS codes for ecosystem names. This table contains 3 columns. Data columns are as follows: 1. Ecosystem Code: USGS four-letter code 2. Ecosystem Name: ecosystem name 3. Ecosystem Name and Code: the ecosystem name followed by the USGS code in parentheses The Cloud Plots file contains 110 columns. There are three records for each of the 139 AUs that were quantitatively assessed (one record for each of three variables: cell size, estimated ultimate recovery, and sweet spot percent). The .tab file includes the data variables described below. The Microsoft Excel version includes not only a worksheet with the variables described below but also separate worksheets and plots for the 12 combinations of reservoir type and variable. In the plots, each blue line represents the distribution for a single assess

ment unit and the black diamond represents the mean of the distribution. Data columns for these files are as follows: 1. AU Number: USGS assessment-unit code number. 2. AU: USGS assessment unit name 3. Province Number: province code number. 4. Province: province name. 5. Reservoir Type: shale gas, coalbed gas, tight gas, or continuous oil. 6. Date: date of assessment. 7. Variable: cell size, EUR (estimated ultimate recov

ery), or sweet spot percent. 8. Fractile for Mean: the fractile that corresponds to the mean value of the distribution. 9. Mean: the mean value of the distribution. 10–110. F100 to F0: fractiles of the distribution. F95 rep

resents a 95 percent chance of at least the amount tabulated. Other fractiles are defined similarly.

Central Energy Resources Science Center Publishing support provided by: Denver Publishing Service Center For more information concerning this publication, contact: Center Director, USGS Central Energy Resources Science Center Box 25046, Mail Stop 939 Denver, CO 80225 (303) 236-1647 Or visit the Central Energy Resources Science Center Web site at: http://energy.usgs.gov/ This publication is available online at: http://dx.doi.org/10.3133/ds69MMU.S. Continuous Resources Assessment Team**—U.S. Geological Survey Assessments of Continuous (Unconventional) Oil and Gas Resources, 2000 to 2011—**Digital Data Series 69–MM

ISSN 2327-638X (online) ISSN 2333-0481 (CD/DVD) http://dx.doi.org/10.3133/ds69MM