Input-Form Data for the U.S. Geological Survey 

Assessment of the Mississippian Barnett Shale of the 

Bend Arch–Fort Worth Basin Province, 2015

By Kristen R. Marra, Ronald R. Charpentier, Christopher J. Schenk, Michael D. Lewan, Heidi M. LeathersMiller, Timothy R. Klett, Stephanie B. Gaswirth, Phuong A. Le, Tracey J. Mercier, Janet K. Pitman, and 

Marilyn E. Tennyson

Open-File Report 2016–1097

U.S. Department of the Interior

U.S. Geological Survey
ii

U.S. Department of the Interior

SALLY JEWELL, Secretary

U.S. Geological Survey

Suzette M. Kimball, Director

U.S. Geological Survey, Reston, Virginia: 2016 

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://store.usgs.gov or call 1–888–ASK–USGS (1–888–275–8747). 

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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:

Marra, K.R., Charpentier, R.R., Schenk, C.J., Lewan, M.D., Leathers-Miller, H.M., Klett, T.R., Gaswirth, 

S.B., Le, P.A., Mercier, T.J., Pitman, J.K., and Tennyson, M.E., 2016, Input-form data for the U.S. 

Geological Survey assessment of the Mississippian Barnett Shale of the Bend Arch–Fort Worth Basin 

Province, 2015: U.S. Geological Survey Open-File Report 2016-1097, 31 p., 

http://dx.doi.org/10.3133/ofr20161097. 

ISSN 2331-1258 (online)
iii

Contents

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

Assessment Methodology.............................................................................................................................. 1

Summary Data-Input Forms for Assessment................................................................................................. 2

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

Tables

1. Input parameters for the Barnett Continuous Gas Assessment Unit (50450161), 

Bend Arch–Fort Worth Basin Province ............................................................................................. 4

2. Input parameters for the Barnett Mixed Continuous Gas and Oil Assessment Unit (50450162), 

Bend Arch–Fort Worth Basin Province ........................................................................................... 18
Input-Form Data for the U.S. Geological Survey 

Assessment of the Mississippian Barnett Shale of the 

Bend Arch–Fort Worth Basin Province, 2015

By Kristen R. Marra, Ronald R. Charpentier, Christopher J. Schenk, Michael D. Lewan, Heidi M. LeathersMiller, Timothy R. Klett, Stephanie B. Gaswirth, Phuong A. Le, Tracey J. Mercier, Janet K. Pitman, and 

Marilyn E. Tennyson

Introduction

In 2015, the U.S. Geological Survey (USGS) released an updated assessment of 

undiscovered, technically recoverable shale gas and shale oil resources of the Mississippian 

Barnett Shale in north-central Texas (Marra and others, 2015). The Barnett Shale was assessed 

using the standard continuous (unconventional) methodology established by the USGS for two 

assessment units (AUs): (1) Barnett Continuous Gas AU, and (2) Barnett Mixed Continuous Gas 

and Oil AU. A third assessment unit, the Western Barnett Continuous Oil AU, was also defined 

but was not quantitatively assessed because of limited data within the extent of the AU. The 

purpose of this report is to provide supplemental documentation of the quantitative input 

parameters applied in the Barnett Shale assessment. 

Assessment Methodology

The USGS uses two distinct peer-reviewed methodologies to assess for conventional and 

continuous resource accumulations. While both methodologies result in probabilistic estimates of 

undiscovered petroleum resources, each require specific input parameters. Conventional 

resources are defined where oil or natural gas is buoyant upon water and where petroleum 

resources have migrated into structural and (or) stratigraphic traps. The primary input data are 

related to the numbers and sizes of undiscovered conventional accumulations (Klett and others, 

2005). In contrast, a continuous resource accumulation is defined as oil and (or) natural gas that 

has been generated from a thermally mature source rock and has remained within or adjacent to 

the source rock. The continuous resource assessment methodology is primarily focused on the 

uncertainties regarding the average drainage area of wells and the average estimated ultimate 

recoveries (EURs) of wells, as well as the projection of future success ratios (Charpentier and 

Cook, 2012). These methodologies are summarized in more detail in multiple published reports 

(Klett and Charpentier, 2003; Crovelli, 2005; Klett and Schmoker, 2005; Klett and others, 2005; 

Schmoker, 2005; Schmoker and Klett, 2005; Charpentier and Cook, 2012). 

For the Barnett Shale assessment, the statistically based summary input data form for 

continuous resources was used for both quantitatively assessed AUs to document the descriptive 

information used in the resource calculation for each defined assessment unit (Charpentier and 

Cook, 2012). For the Barnett Mixed Continuous Oil and Gas AU, a modification was made to 

1
the continuous input data form for “sweet spot” areas to incorporate both oil and gas production 

within the AU (line 4 on the form), as the assessment unit type was characterized as both gas and 

oil. A “sweet spot” is generally defined as an area with favorable geologic characteristics for 

petroleum resource production, including an adequate thermal history, gas content, and matrix 

rock properties. In this case, the percentage of untested assessment-unit area in sweet spots 

(given in percent) was modified to represent the percent of undrilled wells that could potentially 

be oil wells (also given in percent). Subsequently, the section for estimated ultimate recovery 

distributions per well in sweet spot areas (lines 5a and 5b) and nonsweet spot areas (lines 6a and 

6b) was changed to reflect the future success ratio and average EUR distributions for oil wells 

and for gas wells, respectively. In addition, data for the coproduct ratios and ancillary data 

section were provided for both oil and gas wells. 

Summary Data-Input Forms for Assessment

The data-input forms for the two quantitatively assessed Barnett Shale AUs are provided 

in tables 1 and 2. 

References Cited

Charpentier, R.R., and Cook, T.A., 2012, Improved USGS methodology for assessing continuous 

petroleum resources, version 2.0: U.S. Geological Survey Data Series 547, 22 p. 

Crovelli, R.A., 2005, Analytical resource method for continuous petroleum accumulations—The 

ACCESS assessment methodology, chap. 22 of USGS Southwestern Wyoming Province 

Assessment Team, Petroleum systems and geologic assessment of the Southwestern Wyoming 

Province, Wyoming, Colorado, and Utah: U.S. Geological Survey Digital Data Series DDS– 

69–B, 10 p. 

Klett, T.R., and Charpentier, R.R., 2003, FORSPAN Model users guide: U.S. Geological Survey 

Open-File Report 2003–354, 37 p. 

Klett, T.R., and Schmoker, J.W., 2005, Input-data form and operational procedure for the 

assessment of continuous accumulations, 2002, chap. 18 of USGS Southwestern Wyoming 

Province Assessment Team, Petroleum systems and geologic assessment of the Southwestern 

Wyoming Province, Wyoming, Colorado, and Utah: U.S. Geological Survey Digital Data 

Series DDS–69–D, 8 p. 

Klett, T.R., Schmoker, J.W., and Charpentier, R.R., 2005, U.S. Geological Survey input-data 

form and operational procedure for the assessment of conventional petroleum accumulations, 

chap. 20 of USGS Southwestern Wyoming Province Assessment Team, Petroleum systems 

and geologic assessment of the Southwestern Wyoming Province, Wyoming, Colorado, and 

Utah: U.S. Geological Survey Digital Data Series DDS–69–D, 7 p. 

Marra, K.R., Charpentier, R.R., Schenk, C.J., Lewan, M.D., Leathers-Miller, H.M., Klett, T.R., 

Gaswirth, S.B., Le, P.A., Mercier, T.J., Pitman, J.K., and Tennyson, M.E., 2015, Assessment 

of undiscovered shale gas and shale oil resources in the Mississippian Barnett Shale, Bend 

Arch–Fort Worth Basin Province, north-central Texas: U.S. Geological Survey Fact Sheet 

2015–3078, 2 p. 

Schmoker, J.W., 2005, U.S. Geological Survey assessment concepts for continuous petroleum 

accumulations, chap. 13 of USGS Southwestern Wyoming Province Assessment Team, 

Petroleum systems and geologic assessment of the Southwestern Wyoming Province, 

Wyoming, Colorado, and Utah: U.S. Geological Survey Data Series DDS–69–D, 7 p. 

2
Schmoker, J.W., and Klett, T.R., 2005, U.S. Geological Survey assessment concepts for 

conventional petroleum accumulations, chap. 19 of USGS Southwestern Wyoming Province 

Assessment Team, Petroleum systems and geologic assessment of the Southwestern Wyoming 

Province, Wyoming, Colorado, and Utah: U.S. Geological Survey Data Series DDS–69–D, 6 p. 

ISSN 2331-1258 (online)

http://dx.doi.org/10.3133/ofr20161097

3
Table 1. (following 13 pages) Input parameters for the Barnett Continuous Gas Assessment Unit 

(50450161), Bend Arch–Fort Worth Basin Province. [bcfg, billion cubic feet of gas; mmcfg, million cubic feet 

of gas, cfg, cubic feet of gas; mmbo, million barrels of oil; bo, barrel of oil, bliq, barrel of liquid; bngl, barrel 

of natural gas liquids; m, meters; AU, assessment unit; EUR, estimated ultimate recovery]

4
Assessment Geologist: K.R. Marra Date: 8/26/2015

Region: North America Number: 5

Province: Bend Arch-Fort Worth Basin Number: 5045

Total Petroleum System: Barnett-Paleozoic Number: 504501

Assessment Unit: Barnett Continuous Gas Number: 50450161

Based on Data as of: IHS (2015)

Notes from Assessor:

Assessment-unit type: oil (<20,000 cfg/bo) gas (>20,000 cfg/bo) X

heavy oil (<10 API)

Well type: vertical horizontal X

Major reservoir type (Choose one.):

shale X low-permeability clastics

coal low-permeability carbonates

diatomite

Minimum EUR per well 0.02 (mmbo for oil AU; bcfg for gas AU)

Number of tested wells: 18,922

Number of tested wells with EUR > minimum: 16,577

Historic success ratio, tested wells (%) 88

Assessment-Unit Probability:

What is the probability that at least one well within the AU will have

production capacity of at least the minimum EUR? 1.0

1. Productive area of accumulation (acres): (triangular)

calculated mean 6,473,000 minimum 6,000,000 mode 6,419,000 maximum 7,000,000

2. Uncertainty about average drainage area of wells (acres): (triangular)

calculated mean 100 minimum 60 mode 100 maximum 140

3. Percentage of total assessment-unit area that is untested (%): (triangular)

calculated mean 73 minimum 65 mode 73 maximum 80

4. Percentage of untested assessment-unit area in sweet spots (%): (triangular)

calculated mean 28 minimum 15 mode 30 maximum 40

USGS U.S. PETROLEUM RESOURCES ASSESSMENT

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS (version 1.3, April 29, 2015)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

Page 1

5
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

5a. Future success ratio (%): (triangular)

calculated mean 89 minimum 85 mode 90 maximum 92

5b. Uncertainty about average EUR (mmbo for oil; bcfg for gas): (shifted truncated lognormal)

calculated mean 2.034 minimum 1 median 2 maximum 3

6a. Future success ratio (%): (triangular)

calculated mean 73 minimum 60 mode 75 maximum 85

6b. Uncertainty about average EUR (mmbo for oil; bcfg for gas): (shifted truncated lognormal)

calculated mean 0.956 minimum 0.5 median 0.9 maximum 2

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo)

 NGL/gas ratio (bngl/mmcfg)

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg) 0.5 1.3 2

NON-SWEET SPOTS

(triangular)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

Page 2

6
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees)

 Sulfur content of oil (%)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Gas assessment unit: minimum median maximum

 Inert-gas content (%) 0.50 2.50 20.00

 CO2 content (%) 0.10 1.00 5.00

 Hydrogen sulfide content (%) 0.00 0.00 0.00

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

700 1900 3000

Completion practices:

1. Typical well-completion practices (conventional, open hole, open cavity, other) conventional

2. Fraction of wells drilled that are typically stimulated 1

3. Predominant type of stimulation (none, frac, acid, other) frac

4. Historic fraction of wells drilled that are horizontal 0.72

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

Page 3

7
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

1. Texas

Onshore: 100 area % of the AU

100 mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

2.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

3.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

4.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

5.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

Surface Allocations

Page 4

8
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

6.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

7.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

8.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

9.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

10.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

(continued)

Page 5

9
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

1. Number: 5045 Name: Bend Arch-Forth Worth Basin

Onshore: 99.62 area % of the AU

100.00 mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

2. Number: 5049 Name: Gulf Coast Mesozoic

Onshore: 0.38 area % of the AU

0.00 mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

3. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

4. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

5. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

Surface Allocations

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO PROVINCES

Page 6

10
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

6. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

7. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

8. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

9. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

10. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

(continued)

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO PROVINCES

Page 7

11
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

1. Federal Lands is 2.95 % of the AREA of the AU

mean VOLUME % in entity 1.5

2. Private Lands is 0.01 % of the AREA of the AU

mean VOLUME % in entity 0

3. Tribal Lands is % of the AREA of the AU

mean VOLUME % in entity

4. Other Lands is 96.88 % of the AREA of the AU

mean VOLUME % in entity 98.33

5. Texas State Lands is 0.17 % of the AREA of the AU

mean VOLUME % in entity 0.17

6. is % of the AREA of the AU

mean VOLUME % in entity

7. is % of the AREA of the AU

mean VOLUME % in entity

8. is % of the AREA of the AU

mean VOLUME % in entity

9. is % of the AREA of the AU

mean VOLUME % in entity

10. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO GENERAL LAND OWNERSHIPS

Surface Allocations

Page 8

12
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

11. is % of the AREA of the AU

mean VOLUME % in entity

12. is % of the AREA of the AU

mean VOLUME % in entity

13. is % of the AREA of the AU

mean VOLUME % in entity

14. is % of the AREA of the AU

mean VOLUME % in entity

15. is % of the AREA of the AU

mean VOLUME % in entity

16. is % of the AREA of the AU

mean VOLUME % in entity

17. is % of the AREA of the AU

mean VOLUME % in entity

18. is % of the AREA of the AU

mean VOLUME % in entity

19. is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO GENERAL LAND OWNERSHIPS

(continued)

Page 9

13
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

1. Bureau of Land Management (BLM) is % of the AREA of the AU

mean VOLUME % in entity

2. BLM Wilderness Areas (BLMW) is % of the AREA of the AU

mean VOLUME % in entity

3. BLM Roadless Areas (BLMR) is % of the AREA of the AU

mean VOLUME % in entity

4. National Park Service (NPS) is % of the AREA of the AU

mean VOLUME % in entity

5. NPS Wilderness Areas (NPSW) is % of the AREA of the AU

mean VOLUME % in entity

6. NPS Protected Withdrawals (NPSP) is % of the AREA of the AU

mean VOLUME % in entity

7. US Forest Service (FS) is 0.31 % of the AREA of the AU

mean VOLUME % in entity 0.5

8. USFS Wilderness Areas (FSW) is % of the AREA of the AU

mean VOLUME % in entity

9. USFS Roadless Areas (FSR) is % of the AREA of the AU

mean VOLUME % in entity

10. USFS Protected Withdrawals (FSP) is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

Surface Allocations

Page 10

14
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

11. US Fish and Wildlife Service (FWS) is % of the AREA of the AU

mean VOLUME % in entity

12. USFWS Wilderness Areas (FWSW) is % of the AREA of the AU

mean VOLUME % in entity

13. USFWS Protected Withdrawals (FWSP) is % of the AREA of the AU

mean VOLUME % in entity

14. Wilderness Study Areas (WS) is % of the AREA of the AU

mean VOLUME % in entity

15. Department of Energy (DOE) is % of the AREA of the AU

mean VOLUME % in entity

16. Department of Defense (DOD) is 2.63 % of the AREA of the AU

mean VOLUME % in entity 1

17. Bureau of Reclamation (BOR) is % of the AREA of the AU

mean VOLUME % in entity

18. Tennessee Valley Authority (TVA) is % of the AREA of the AU

mean VOLUME % in entity

19. Other Federal is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

(continued)

Page 11

15
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

1. Blackland Prairies (BLPR) is 0.17 % of the AREA of the AU

mean VOLUME % in entity 0.00

2. Cross Timbers and Prairie (CRTP) is 83.85 % of the AREA of the AU

mean VOLUME % in entity 95.00

3. Edwards Plateau (EDPT) is 15.99 % of the AREA of the AU

mean VOLUME % in entity 5.00

4. is % of the AREA of the AU

mean VOLUME % in entity

5. is % of the AREA of the AU

mean VOLUME % in entity

6. is % of the AREA of the AU

mean VOLUME % in entity

7. is % of the AREA of the AU

mean VOLUME % in entity

8. is % of the AREA of the AU

mean VOLUME % in entity

9. is % of the AREA of the AU

mean VOLUME % in entity

10. is % of the AREA of the AU

mean VOLUME % in entity

Surface Allocations

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

Page 12

16
Assessment Unit (name, no.)

Barnett Continuous Gas, 50450161

11. is % of the AREA of the AU

mean VOLUME % in entity

12. is % of the AREA of the AU

mean VOLUME % in entity

13. is % of the AREA of the AU

mean VOLUME % in entity

14. is % of the AREA of the AU

mean VOLUME % in entity

15. is % of the AREA of the AU

mean VOLUME % in entity

16. is % of the AREA of the AU

mean VOLUME % in entity

17. is % of the AREA of the AU

mean VOLUME % in entity

18. is % of the AREA of the AU

mean VOLUME % in entity

19. is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

(continued)

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

Page 13

17
Table 2. (following 13 pages) Input parameters for the Barnett Mixed Continuous Gas and Oil 

Assessment Unit (50450162), Bend Arch–Fort Worth Basin Province. [bcfg, billion cubic feet of gas; 

mmcfg, million cubic feet of gas, cfg, cubic feet of gas; mmbo, million barrels of oil; bo, barrel of oil, bliq, 

barrel of liquid; bngl, barrel of natural gas liquids; m, meters; AU, assessment unit; EUR, estimated ultimate 

recovery] 

18
Assessment Geologist: K.R. Marra Date: 9/2/2015

Region: North America Number: 5

Province: Bend Arch-Fort Worth Basin Number: 5045

Total Petroleum System: Barnett-Paleozoic Number: 504501

Assessment Unit: Barnett Mixed Continuous Gas and Oil Number: 50450162

Based on Data as of: IHS (2015)

Notes from Assessor:

Assessment-unit type: oil (<20,000 cfg/bo) X gas (>20,000 cfg/bo) X

heavy oil (<10 API)

Well type: vertical horizontal X

Major reservoir type (Choose one.):

shale X low-permeability clastics

coal low-permeability carbonates

diatomite

Minimum EUR per well 0.002 MMB(mmbo for oil AU; bcfg for gas AU)

Number of tested wells: 3448

Number of tested wells with EUR > minimum: 2350

Historic success ratio, tested wells (%) 68

Assessment-Unit Probability:

What is the probability that at least one well within the AU will have

production capacity of at least the minimum EUR? 1.0

1. Productive area of accumulation (acres): (triangular)

calculated mean 2,019,000 minimum 1,700,000 mode 2,057,000 maximum 2,300,000

2. Uncertainty about average drainage area of wells (acres): (triangular)

calculated mean 100 minimum 60 mode 100 maximum 140

3. Percentage of total assessment-unit area that is untested (%): (triangular)

calculated mean 84 minimum 75 mode 85 maximum 92

4. Percentage of untested wells that are oil wells (%): (triangular)

calculated mean 60 minimum 40 mode 65 maximum 75

USGS U.S. PETROLEUM RESOURCES ASSESSMENT

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR MIXED CONTINUOUS ACCUMULATIONS (version 1.0, September 1, 2015)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

Page 1

19
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

5a. Future success ratio (%): (triangular)

calculated mean 47 minimum 30 mode 45 maximum 65

5b. Uncertainty about average EUR (mmbo for oil): (shifted truncated lognormal)

calculated mean 0.036 minimum 0.02 median 0.035 maximum 0.05

6a. Future success ratio (%): (triangular)

calculated mean 47 minimum 30 mode 45 maximum 65

6b. Uncertainty about average EUR (bcfg for gas): (shifted truncated lognormal)

calculated mean 1.017 minimum 0.5 median 1 maximum 1.5

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 7500 8400 8600

 NGL/gas ratio (bngl/mmcfg) 15 30 45

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg) 15 22 30

GAS WELLS

(triangular)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

OIL WELLS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

Page 2

20
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

Oil wells: minimum median maximum

 API gravity of oil (degrees) 35 45 55

 Sulfur content of oil (%) 0 0.01 0.1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

1100 1900 3050

Gas wells: minimum median maximum

 Inert-gas content (%) 0.50 2.50 20.00

 CO2 content (%) 0.10 1.00 5.00

 Hydrogen sulfide content (%) 0.00 0.00 0.00

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

1100 1900 3050

Completion practices:

1. Typical well-completion practices (conventional, open hole, open cavity, other) conv

2. Fraction of wells drilled that are typically stimulated 1

3. Predominant type of stimulation (none, frac, acid, other) frac

4. Historic fraction of wells drilled that are horizontal 0.66

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

Page 3

21
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

1. Texas

Onshore: 100.00 area % of the AU

100.00 mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

2.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

3.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

4.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

5.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

Surface Allocations

Page 4

22
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

6.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

7.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

8.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

9.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

10.

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

(continued)

Page 5

23
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

1. Number: 5045 Name: Bend Arch-Fort Worth Basin

Onshore: 100.00 area % of the AU

100.00 mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

2. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

3. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

4. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

5. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

Surface Allocations

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO PROVINCES

Page 6

24
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

6. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

7. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

8. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

9. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

10. Number: Name:

Onshore: area % of the AU

mean volume % of the AU

Offshore: area % of the AU

mean volume % of the AU

(continued)

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO PROVINCES

Page 7

25
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

1. Federal Lands is 4.64 % of the AREA of the AU

mean VOLUME % in entity 10

2. Private Lands is % of the AREA of the AU

mean VOLUME % in entity

3. Tribal Lands is % of the AREA of the AU

mean VOLUME % in entity

4. Other Lands is 95.32 % of the AREA of the AU

mean VOLUME % in entity 89.96

5. Texas State Lands is 0.04 % of the AREA of the AU

mean VOLUME % in entity 0.04

6. is % of the AREA of the AU

mean VOLUME % in entity

7. is % of the AREA of the AU

mean VOLUME % in entity

8. is % of the AREA of the AU

mean VOLUME % in entity

9. is % of the AREA of the AU

mean VOLUME % in entity

10. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO GENERAL LAND OWNERSHIPS

Surface Allocations

Page 8

26
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

11. is % of the AREA of the AU

mean VOLUME % in entity

12. is % of the AREA of the AU

mean VOLUME % in entity

13. is % of the AREA of the AU

mean VOLUME % in entity

14. is % of the AREA of the AU

mean VOLUME % in entity

15. is % of the AREA of the AU

mean VOLUME % in entity

16. is % of the AREA of the AU

mean VOLUME % in entity

17. is % of the AREA of the AU

mean VOLUME % in entity

18. is % of the AREA of the AU

mean VOLUME % in entity

19. is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO GENERAL LAND OWNERSHIPS

(continued)

Page 9

27
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

1. Bureau of Land Management (BLM) is % of the AREA of the AU

mean VOLUME % in entity

2. BLM Wilderness Areas (BLMW) is % of the AREA of the AU

mean VOLUME % in entity

3. BLM Roadless Areas (BLMR) is % of the AREA of the AU

mean VOLUME % in entity

4. National Park Service (NPS) is % of the AREA of the AU

mean VOLUME % in entity

5. NPS Wilderness Areas (NPSW) is % of the AREA of the AU

mean VOLUME % in entity

6. NPS Protected Withdrawals (NPSP) is % of the AREA of the AU

mean VOLUME % in entity

7. US Forest Service (FS) is 4.64 % of the AREA of the AU

mean VOLUME % in entity 10

8. USFS Wilderness Areas (FSW) is % of the AREA of the AU

mean VOLUME % in entity

9. USFS Roadless Areas (FSR) is % of the AREA of the AU

mean VOLUME % in entity

10. USFS Protected Withdrawals (FSP) is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

Surface Allocations

Page 10

28
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

11. US Fish and Wildlife Service (FWS) is % of the AREA of the AU

mean VOLUME % in entity

12. USFWS Wilderness Areas (FWSW) is % of the AREA of the AU

mean VOLUME % in entity

13. USFWS Protected Withdrawals (FWSP) is % of the AREA of the AU

mean VOLUME % in entity

14. Wilderness Study Areas (WS) is % of the AREA of the AU

mean VOLUME % in entity

15. Department of Energy (DOE) is % of the AREA of the AU

mean VOLUME % in entity

16. Department of Defense (DOD) is 0.00 % of the AREA of the AU

mean VOLUME % in entity

17. Bureau of Reclamation (BOR) is % of the AREA of the AU

mean VOLUME % in entity

18. Tennessee Valley Authority (TVA) is % of the AREA of the AU

mean VOLUME % in entity

19. Other Federal is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

(continued)

Page 11

29
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

1. Cross Timbers and Prairie (CRTP) is 84.44 % of the AREA of the AU

mean VOLUME % in entity 97

2. Rolling Plains (RLPL) is 15.56 % of the AREA of the AU

mean VOLUME % in entity 3

3. is % of the AREA of the AU

mean VOLUME % in entity

4. is % of the AREA of the AU

mean VOLUME % in entity

5. is % of the AREA of the AU

mean VOLUME % in entity

6. is % of the AREA of the AU

mean VOLUME % in entity

7. is % of the AREA of the AU

mean VOLUME % in entity

8. is % of the AREA of the AU

mean VOLUME % in entity

9. is % of the AREA of the AU

mean VOLUME % in entity

10. is % of the AREA of the AU

mean VOLUME % in entity

Surface Allocations

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

Page 12

30
Assessment Unit (name, no.)

Barnett Mixed Continuous Gas and Oil, 50450162

11. is % of the AREA of the AU

mean VOLUME % in entity

12. is % of the AREA of the AU

mean VOLUME % in entity

13. is % of the AREA of the AU

mean VOLUME % in entity

14. is % of the AREA of the AU

mean VOLUME % in entity

15. is % of the AREA of the AU

mean VOLUME % in entity

16. is % of the AREA of the AU

mean VOLUME % in entity

17. is % of the AREA of the AU

mean VOLUME % in entity

18. is % of the AREA of the AU

mean VOLUME % in entity

19. is % of the AREA of the AU

mean VOLUME % in entity

20. is % of the AREA of the AU

mean VOLUME % in entity

(continued)

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

Page 13

31