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

Assessment of the Devonian and Mississippian 

Bakken and Devonian Three Forks Formations of the 

U.S. Williston Basin Province, 2013

By U.S. Geological Survey Bakken-Three Forks Assessment Team

Open-File Report 2013–1094

U.S. Department of the Interior

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

KEN SALAZAR, Secretary

U.S. Geological Survey

Suzette M. Kimball, Acting Director

U.S. Geological Survey, Reston, Virginia: 2013 

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Suggested citation: 

U.S. Geological Survey Bakken-Three Forks Assessment Team, 2013, Input-form data for the U.S. 

Geological Survey assessment of the Devonian and Mississippian Bakken and Devonian Three Forks 

Formations of the U.S. Williston Basin Province, 2013: U.S. Geological Survey Open-File Report 2013–

1094, 70 p., http://pubs.usgs.gov/of/2013/1094/.

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endorsement by the U.S. Government.

Although this information product, for the most part, is in the public domain, it also may contain

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secured from the copyright owner.
iii

Contents

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

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

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

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

Tables

1. Input parameters for the Middle Bakken Conventional Assessment Unit (50310101), Bakken Total 

Petroleum System, Williston Basin Province .................................................................................... 4 

2. Input parameters for the Three Forks Conventional Assessment Unit (50310103), Bakken Total 

Petroleum System, Williston Basin Province .................................................................................. 13

3. Input parameters for the Elm Coulee-Billings Nose Continuous Oil Assessment Unit (50310161), 

Bakken Total Petroleum System, Williston Basin Province ............................................................ 23

4. Input parameters for the Central Basin Continuous Oil Assessment Unit (50310162), Bakken Total 

Petroleum System, Williston Basin Province .................................................................................. 31

5. Input parameters for the Nesson-Little Knife Continuous Oil Assessment Unit (50310163), Bakken 

Total Petroleum System, Williston Basin Province ......................................................................... 39

6. Input parameters for the Eastern Transitional Continuous Oil Assessment Unit (50310164), Bakken 

Total Petroleum System, Williston Basin Province ......................................................................... 47

7. Input parameters for the Northwest Transitional Continuous Oil Assessment Unit (50310165), 

Bakken Total Petroleum System, Williston Basin Province ............................................................ 55

8. Input parameters for the Three Forks Continuous Oil Assessment Unit (50310166), Bakken Total 

Petroleum System, Williston Basin Province .................................................................................. 63
Input-Form Data for the U.S. Geological Survey 

Assessment of the Devonian and Mississippian 

Bakken and Devonian Three Forks Formations of the 

U.S. Williston Basin Province, 2013

By U.S. Geological Survey Bakken-Three Forks Assessment Team: 

Stephanie B. Gaswirth, Kristen R. Marra, Troy A. Cook, Ronald R. Charpentier, Donald L. Gautier, 

Debra K. Higley, Timothy R. Klett, Michael D. Lewan, Paul G. Lillis, Christopher J. Schenk, 

Marilyn E. Tennyson, and Katherine J. Whidden

Introduction

In 2013, the U.S. Geological Survey (USGS) assessed the technically recoverable oil and 

gas resources of the Bakken and Three Forks Formations of the U.S. portion of the Williston 

Basin (Gaswirth and others, 2013). The Bakken and Three Forks Formations were assessed as 

continuous and hypothetical conventional oil accumulations using a methodology similar to that 

used in the assessment of other continuous- and conventional-type assessment units (AUs) 

throughout the United States. The purpose of this report is to provide supplemental 

documentation and information used in the Bakken-Three Forks assessment.

Assessment Methodology

The 2000 Energy Policy and Conservation Act legislation requires the USGS to assess

the undiscovered, technically recoverable oil and gas resources of priority geologic provinces of 

the United States using an unbiased and scientific-based assessment methodology. The USGS 

developed two peer-reviewed methodologies, one for conventional resources and one for 

continuous resources. Since 2000, these methodologies have been used in the assessments of 

provinces throughout the United States. The methodology for the assessment of conventional and 

continuous resources is summarized in several documents (Klett and Charpentier, 2003; Crovelli, 

2005; Klett and Schmoker, 2005; Klett and others, 2005; Schmoker, 2005; Schmoker and Klett, 

2005; Charpentier and Cook, 2012). 

The assessment team developed a geologic framework for the priority basins and 

assessment areas. They also completed statistically based summary data forms that include

descriptive information for each geologic assessment unit. The data were subsequently used in 

the assessment calculations. 
2 

Summary Data-Input Forms for Assessment

The data-input forms for the six Bakken Formation AUs (five continuous, one 

conventional) are provided in tables 1 and 3–7. The input forms for the two Three Forks AUs

(one continuous, one conventional) are provided in tables 8 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–D, 10 p. 

Gaswirth, S.B., Marra, K.R., Cook, T.A., Charpentier, R.R., Gautier, D.L., Higley, D.K., Klett, 

T.R., Lewan, M.D., Lillis, P.G., Schenk, C.J., Tennyson, M.E., and Whidden, K.J., 2013, 

Assessment of undiscovered oil resources in the Bakken and Three Forks Formations, 

Williston Basin Province, Montana, North Dakota, and South Dakota, 2013: U.S. Geological 

Survey Fact Sheet 2013–3013, 4 p. 

IHS Energy Group, 2012, Petroleum Information/Dwights petroROM Rocky Mountain Region 

production data on CD-ROM: IHS Energy Group, 15 Inverness Way East, D205, Englewood, 

CO, 80112, U.S.A. 

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. 

NRG Associates, 2010, The significant oil and gas fields of the United States: NRG Associates, 

Inc., database available from NRG Associates, Inc., P.O Box 1655, Colorado Springs, CO 

80901, U.S.A. 

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 Formation, Williston Basin Province, 

Montana and North Dakota, 2008: U.S. Geological Survey Fact Sheet 2008–3021, 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. 
3 

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.
SEVENTH APPROXIMATION

DATA FORM FOR CONVENTIONAL ASSESSMENT UNITS (Version 6, 9 April 2003)

CHARACTERISTICS OF ASSESSMENT UNIT

or

Assessment-Unit Probabilities:

CHARGE: 

ROCKS: 

TIMING OF GEOLOGIC EVENTS:

Assessment-Unit GEOLOGIC Probability

UNDISCOVERED ACCUMULATIONS

No. of Undiscovered Accumulations: 

Sizes of Undiscovered Accumulations: grown

IDENTIFICATION INFORMATION

Table 1. Input parameters for the Middle Bakken Conventional Assessment Unit (50310101), Bakken Total Petroleum System, Williston Basin 

Province. [bcfg, billion cubic feet of gas; mmcfg, million cubic feet of gas; cfg, cubic feet of gas; mmbo, million barrels of oil; mmboe, million 

barrels of oil equivalent; bo, barrel of oil; bliq, barrel of liquid; bngl, barrel of natural gas liquids; m, meters; AU, assessment unit] 

Hypothetical (no accum:)

Favorable timing for an undiscoverd accum. ≥ minimum size:

4
Page 2

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

AVERAGE RATIOS FOR UNDISCOVERED ACCUMS., TO ASSESS COPRODUCTS

(uncertainty of fixed but unknown values)

Oil Accumulations: minimum mode maximum

Gas/oil ratio (cfg/bo) 200 400 600

NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas Accumulations: minimum mode maximum

Liquids/gas ratio (bliq/mmcfg)

Oil/gas ratio (bo/mmcfg)

SELECTED ANCILLARY DATA FOR UNDISCOVERED ACCUMULATIONS

(variations in the properties of undiscovered accumulations)

Oil Accumulations: minimum mode maximum

API gravity (degrees) 25 40 50

Sulfur content of oil (%) 0.01 0.1 1

Depth (m) of water (if applicable)

minimum F75 mode F25 maximum

Drilling Depth (m) 750 2000 2750

Gas Accumulations: minimum mode maximum

Inert gas content (%)

CO2 content (%)

Hydrogen-sulfide content (%)

Depth (m) of water (if applicable)

minimum F75 mode F25 maximum

Drilling Depth (m)

5
Page 3

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

Surface Allocations (uncertainty of a fixed value)

1. Montana represents 15.76 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 15.00

Gas in Gas Accumulations:

Volume % in entity

2. North Dakota represents 84.24 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 85.00

Gas in Gas Accumulations:

Volume % in entity

3. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

4. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

5. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

6. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

6
Page 4

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands represents 8.55 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 9.00

Gas in Gas Accumulations:

Volume % in entity

2. Private Lands represents 83.42 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 83.00

Gas in Gas Accumulations:

Volume % in entity

3. Tribal Lands represents 3.82 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 3.00

Gas in Gas Accumulations:

Volume % in entity

4. Other Lands represents 0.63 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 1.00

Gas in Gas Accumulations:

Volume % in entity

5. MT State Lands represents 1.83 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.00

Gas in Gas Accumulations:

Volume % in entity

6. ND State Lands represents 1.75 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.00

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO LAND ENTITIES

7
Page 5

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) represents 4.88 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 5.00

Gas in Gas Accumulations:

Volume % in entity

2. BLM Wilderness Areas (BLMW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

3. BLM Roadless Areas (BLMR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

4. National Park Service (NPS) represents 0.02 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 0.00

Gas in Gas Accumulations:

Volume % in entity

5. NPS Wilderness Areas (NPSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

6. NPS Protected Withdrawals (NPSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

8
Page 6

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

7. US Forest Service (FS) represents 0.01 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 0.00

Gas in Gas Accumulations:

Volume % in entity

8. USFS Wilderness Areas (FSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

9. USFS Roadless Areas (FSR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

10. USFS Protected Withdrawals (FSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

11. US Fish and Wildlife Service (FWS) represents 1.88 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.00

Gas in Gas Accumulations:

Volume % in entity

12. USFWS Wilderness Areas (FWSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

9
Page 7

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

13. USFWS Protected Withdrawals (FWSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

14. Wilderness Study Areas (WS) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

15. Department of Energy (DOE) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

16. Department of Defense (DOD) represents 0.00 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 0.00

Gas in Gas Accumulations:

Volume % in entity

17. Bureau of Reclamation (BOR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

18. Tennessee Valley Authority (TVA) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

10
Page 8

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

19. Other Federal represents 1.76 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.00

Gas in Gas Accumulations:

Volume % in entity

20. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

11
Page 9

Assessment Unit (name, no.)

Middle Bakken Conventional, 50310101

Surface Allocations (uncertainty of a fixed value)

1. Northeastern Glaciated Plains (NEGP) represents 52.98 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 53.00

Gas in Gas Accumulations:

Volume % in entity

2. Northern Glaciated Plains (NGPL) represents 22.92 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 23.00

Gas in Gas Accumulations:

Volume % in entity

3. Northwestern Glaciated Plains (NWGL) represents 15.75 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 16.00

Gas in Gas Accumulations:

Volume % in entity

4. Northwestern Great Plains (NWGP) represents 8.35 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 8.00

Gas in Gas Accumulations:

Volume % in entity

5. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

6. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

12
SEVENTH APPROXIMATION

DATA FORM FOR CONVENTIONAL ASSESSMENT UNITS (Version 6, 9 April 2003)

CHARACTERISTICS OF ASSESSMENT UNIT

or

Assessment-Unit Probabilities:

CHARGE: 

ROCKS: 

TIMING OF GEOLOGIC EVENTS:

Assessment-Unit GEOLOGIC Probability

UNDISCOVERED ACCUMULATIONS

No. of Undiscovered Accumulations: 

Sizes of Undiscovered Accumulations: grown

IDENTIFICATION INFORMATION

Table 2. Input parameters for the Three Forks Conventional Assessment Unit (50310103), Bakken Total Petroleum System, Williston 

Basin Province. [bcfg, billion cubic feet of gas; mmcfg, million cubic feet of gas; cfg, cubic feet of gas; mmbo, million barrels of oil; 

mmboe, million barrels of oil equivalent; bo, barrel of oil; bliq, barrel of liquid; bngl, barrel of natural gas liquids; m, meters; AU, assessment unit]

Hypothetical (no accums:)

minumum size:

13
Page 2

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

AVERAGE RATIOS FOR UNDISCOVERED ACCUMS., TO ASSESS COPRODUCTS

(uncertainty of fixed but unknown values)

Oil Accumulations: minimum mode maximum

Gas/oil ratio (cfg/bo) 200 400 600

NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas Accumulations: minimum mode maximum

Liquids/gas ratio (bliq/mmcfg)

Oil/gas ratio (bo/mmcfg)

SELECTED ANCILLARY DATA FOR UNDISCOVERED ACCUMULATIONS

(variations in the properties of undiscovered accumulations)

Oil Accumulations: minimum mode maximum

API gravity (degrees) 25 40 50

Sulfur content of oil (%) 0.01 0.1 1

Depth (m) of water (if applicable)

minimum F75 mode F25 maximum

Drilling Depth (m) 1250 2200 3100

Gas Accumulations: minimum mode maximum

Inert gas content (%)

CO2 content (%)

Hydrogen-sulfide content (%)

Depth (m) of water (if applicable)

minimum F75 mode F25 maximum

Drilling Depth (m)

14
Page 3

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

Surface Allocations (uncertainty of a fixed value)

1. Montana represents 24.20 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 20.00

Gas in Gas Accumulations:

Volume % in entity

2. North Dakota represents 45.54 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 75.00

Gas in Gas Accumulations:

Volume % in entity

3. South Dakota represents 30.26 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 5.00

Gas in Gas Accumulations:

Volume % in entity

4. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

5. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

6. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

15
Page 4

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands represents 6.02 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 6.00

Gas in Gas Accumulations:

Volume % in entity

2. Private Lands represents 82.62 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 83.00

Gas in Gas Accumulations:

Volume % in entity

3. Tribal Lands represents 5.71 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 6.00

Gas in Gas Accumulations:

Volume % in entity

4. Other Lands represents 0.68 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 1.00

Gas in Gas Accumulations:

Volume % in entity

5. MT State Lands represents 1.41 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 1.00

Gas in Gas Accumulations:

Volume % in entity

6. ND State Lands represents 2.18 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.00

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO LAND ENTITIES

16
Page 5

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

7. SD State Lands represents 1.38 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 1.00

Gas in Gas Accumulations:

Volume % in entity

8. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

9. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

10. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

11. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

12. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

17
Page 6

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) represents 2.73 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 3.00

Gas in Gas Accumulations:

Volume % in entity

2. BLM Wilderness Areas (BLMW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

3. BLM Roadless Areas (BLMR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

4. National Park Service (NPS) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

5. NPS Wilderness Areas (NPSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

6. NPS Protected Withdrawals (NPSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

18
Page 7

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

7. US Forest Service (FS) represents 2.48 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 2.50

Gas in Gas Accumulations:

Volume % in entity

8. USFS Wilderness Areas (FSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

9. USFS Roadless Areas (FSR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

10. USFS Protected Withdrawals (FSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

11. US Fish and Wildlife Service (FWS) represents 0.44 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 0.50

Gas in Gas Accumulations:

Volume % in entity

12. USFWS Wilderness Areas (FWSW) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

19
Page 8

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

13. USFWS Protected Withdrawals (FWSP) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

14. Wilderness Study Areas (WS) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

15. Department of Energy (DOE) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

16. Department of Defense (DOD) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

17. Bureau of Reclamation (BOR) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

18. Tennessee Valley Authority (TVA) represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

20
Page 9

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

19. Other Federal represents 0.37 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 0.00

Gas in Gas Accumulations:

Volume % in entity

20. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

21
Page 10

Assessment Unit (name, no.)

Three Forks Conventional, 50310103

Surface Allocations (uncertainty of a fixed value)

1. Northeastern Glaciated Plains (NEGP) represents 9.14 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 9.00

Gas in Gas Accumulations:

Volume % in entity

2. Northern Glaciated Plains (NGPL) represents 8.27 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 8.00

Gas in Gas Accumulations:

Volume % in entity

3. Northwestern Glaciated Plains (NWGL) represents 5.12 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 5.00

Gas in Gas Accumulations:

Volume % in entity

4. Northwestern Great Plains (NWGP) represents 69.35 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 70.00

Gas in Gas Accumulations:

Volume % in entity

5. Powder River Basin (PRBA) represents 8.11 area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity 8.00

Gas in Gas Accumulations:

Volume % in entity

6. represents area % of the AU

Oil in Oil Accumulations: minimum mode maximum

Volume % in entity

Gas in Gas Accumulations:

Volume % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

22
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

23
Page 2

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

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

calculated mean 99 minimum 98 mode 99 maximum 100

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

calculated mean 0.182 minimum 0.15 median 0.18 maximum 0.22

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

calculated mean 90 minimum 85 mode 90 maximum 95

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

calculated mean 0.102 minimum 0.06 median 0.1 maximum 0.15

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 500 1000 1500

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

24
Page 3

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2130 2895 3200

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 0.9

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

25
Page 4

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

Surface Allocations (uncertainty of a fixed value)

1. Montana is 52.10 % of the AREA of the AU

mean VOLUME % in entity 52.00

2. North Dakota is 47.90 % of the AREA of the AU

mean VOLUME % in entity 48.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

26
Page 5

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 29.66 % of the AREA of the AU

mean VOLUME % in entity 30.00

2. Private Lands is 63.93 % of the AREA of the AU

mean VOLUME % in entity 64.00

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

mean VOLUME % in entity

4. Other Lands is 0.7 % of the AREA of the AU

mean VOLUME % in entity 0.50

5. MT State Lands is 2.75 % of the AREA of the AU

mean VOLUME % in entity 2.50

6. ND State Lands is 2.96 % of the AREA of the AU

mean VOLUME % in entity 3.00

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

27
Page 6

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 1.1 % of the AREA of the AU

mean VOLUME % in entity 1.00

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 1.66 % of the AREA of the AU

mean VOLUME % in entity 2.00

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 26.85 % of the AREA of the AU

mean VOLUME % in entity 27.00

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

28
Page 7

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

(continued)

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 % 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 0.00 % of the AREA of the AU

mean VOLUME % in entity 0.00

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

29
Page 8

Assessment Unit (name, no.)

Elm Coulee-Billings Nose Continuous Oil, 50310161

Surface Allocations (uncertainty of a fixed value)

1. Northern Glaciated Plains (NGPL) is 29.40 % of the AREA of the AU

mean VOLUME % in entity 29.00

2. Northwestern Glaciated Plains (NWGL) is 0.73 % of the AREA of the AU

mean VOLUME % in entity 1.00

3. Northwestern Great Plains (NWGP) is 69.87 % of the AREA of the AU

mean VOLUME % in entity 70.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

30
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

 

31
Page 2

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

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

calculated mean 99 minimum 98 mode 99 maximum 100

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

calculated mean 0.254 minimum 0.225 median 0.25 maximum 0.325

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

calculated mean 88 minimum 80 mode 90 maximum 95

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

calculated mean 0.154 minimum 0.075 median 0.15 maximum 0.25

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 500 1000 1500

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

32
Page 3

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2130 2895 3200

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 0.996

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

33
Page 4

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

Surface Allocations (uncertainty of a fixed value)

1. Montana is 47.95 % of the AREA of the AU

mean VOLUME % in entity 30.00

2. North Dakota is 52.05 % of the AREA of the AU

mean VOLUME % in entity 70.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

34
Page 5

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 8.87 % of the AREA of the AU

mean VOLUME % in entity 10.00

2. Private Lands is 63.08 % of the AREA of the AU

mean VOLUME % in entity 70.00

3. Tribal Lands is 23.30 % of the AREA of the AU

mean VOLUME % in entity 15.00

4. Other Lands is 1.47 % of the AREA of the AU

mean VOLUME % in entity 2.00

5. MT State Lands is 1.35 % of the AREA of the AU

mean VOLUME % in entity 1.00

6. ND State Lands is 1.93 % of the AREA of the AU

mean VOLUME % in entity 2.00

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

35
Page 6

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 1.22 % of the AREA of the AU

mean VOLUME % in entity 1.00

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 0.68 % of the AREA of the AU

mean VOLUME % in entity 1.00

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 4.49 % of the AREA of the AU

mean VOLUME % in entity 5.00

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

36
Page 7

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

(continued)

11. US Fish and Wildlife Service (FWS) is 0.46 % of the AREA of the AU

mean VOLUME % in entity 1.00

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 % 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 2.02 % of the AREA of the AU

mean VOLUME % in entity 2.00

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

37
Page 8

Assessment Unit (name, no.)

Central Basin Continuous Oil, 50310162

Surface Allocations (uncertainty of a fixed value)

1. Northern Glaciated Plains (NGPL) is 77.18 % of the AREA of the AU

mean VOLUME % in entity 77.00

2. Northwestern Glaciated Plains (NWGL) is 6.23 % of the AREA of the AU

mean VOLUME % in entity 6.00

3. Northwestern Great Plains (NWGP) is 16.59 % of the AREA of the AU

mean VOLUME % in entity 17.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

38
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

 

39
Page 2

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

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

calculated mean 99 minimum 98 mode 99 maximum 100

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

calculated mean 0.302 minimum 0.26 median 0.3 maximum 0.35

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

calculated mean 95 minimum 90 mode 95 maximum 100

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

calculated mean 0.178 minimum 0.125 median 0.175 maximum 0.25

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 500 1000 1500

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

40
Page 3

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2130 2895 3200

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 0.95

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

41
Page 4

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

Surface Allocations (uncertainty of a fixed value)

1. North Dakota is 100.00 % of the AREA of the AU

mean VOLUME % in entity 100.00

2. is % of the AREA of the AU

mean VOLUME % in entity

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

42
Page 5

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 6.84 % of the AREA of the AU

mean VOLUME % in entity 7.00

2. Private Lands is 79.03 % of the AREA of the AU

mean VOLUME % in entity 79.00

3. Tribal Lands is 9.08 % of the AREA of the AU

mean VOLUME % in entity 9.00

4. Other Lands is 0.8 % of the AREA of the AU

mean VOLUME % in entity 1.00

5. ND State Lands is 4.21 % of the AREA of the AU

mean VOLUME % in entity 4.00

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

43
Page 6

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 0.45 % of the AREA of the AU

mean VOLUME % in entity 0.50

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 0.08 % of the AREA of the AU

mean VOLUME % in entity 0.00

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 2.67 % of the AREA of the AU

mean VOLUME % in entity 3.00

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

44
Page 7

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

(continued)

11. US Fish and Wildlife Service (FWS) is 0.38 % of the AREA of the AU

mean VOLUME % in entity 0.50

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 % 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 3.25 % of the AREA of the AU

mean VOLUME % in entity 3.00

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

45
Page 8

Assessment Unit (name, no.)

Nesson-Little Knife Continuous Oil, 50310163

Surface Allocations (uncertainty of a fixed value)

1. Northeastern Glaciated Plains (NEGP) is 6.57 % of the AREA of the AU

mean VOLUME % in entity 7.00

2. Northern Glaciated Plains (NGPL) is 46.09 % of the AREA of the AU

mean VOLUME % in entity 46.00

3. Northwestern Great Plains (NWGP) is 47.34 % of the AREA of the AU

mean VOLUME % in entity 47.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

46
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

 

47
Page 2

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

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

calculated mean 99 minimum 98 mode 99 maximum 100

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

calculated mean 0.431 minimum 0.375 median 0.425 maximum 0.55

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

calculated mean 95 minimum 90 mode 95 maximum 100

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

calculated mean 0.231 minimum 0.175 median 0.225 maximum 0.35

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 250 500 750

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

48
Page 3

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2130 2895 3200

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 1

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

49
Page 4

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

Surface Allocations (uncertainty of a fixed value)

1. North Dakota is 100.00 % of the AREA of the AU

mean VOLUME % in entity 100.00

2. is % of the AREA of the AU

mean VOLUME % in entity

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

50
Page 5

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 8.71 % of the AREA of the AU

mean VOLUME % in entity 9.00

2. Private Lands is 69.52 % of the AREA of the AU

mean VOLUME % in entity 69.00

3. Tribal Lands is 17.74 % of the AREA of the AU

mean VOLUME % in entity 18.00

4. Other Lands is 1.03 % of the AREA of the AU

mean VOLUME % in entity 1.00

5. ND State Lands is 3.01 % of the AREA of the AU

mean VOLUME % in entity 3.00

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

51
Page 6

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 0.02 % of the AREA of the AU

mean VOLUME % in entity 0.00

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 % of the AREA of the AU

mean VOLUME % in entity

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

52
Page 7

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

(continued)

11. US Fish and Wildlife Service (FWS) is 1.85 % of the AREA of the AU

mean VOLUME % in entity 2.00

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 % 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 6.83 % of the AREA of the AU

mean VOLUME % in entity 7.00

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

53
Page 8

Assessment Unit (name, no.)

Eastern Transitional Continuous Oil, 50310164

Surface Allocations (uncertainty of a fixed value)

1. Northeastern Glaciated Plains (NEGP) is 34.38 % of the AREA of the AU

mean VOLUME % in entity 34.00

2. Northern Glaciated Plains (NGPL) is 53.04 % of the AREA of the AU

mean VOLUME % in entity 53.00

3. Northwestern Great Plains (NWGP) is 12.58 % of the AREA of the AU

mean VOLUME % in entity 13.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

54
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

 

55
Page 2

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

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

calculated mean 88 minimum 80 mode 90 maximum 95

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

calculated mean 0.154 minimum 0.075 median 0.15 maximum 0.25

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

calculated mean 43 minimum 10 mode 40 maximum 80

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

calculated mean 0.055 minimum 0.005 median 0.05 maximum 0.15

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 350 700 1050

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

56
Page 3

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2130 2895 3200

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 0.88

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

57
Page 4

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

Surface Allocations (uncertainty of a fixed value)

1. Montana is 82.36 % of the AREA of the AU

mean VOLUME % in entity 80.00

2. North Dakota is 17.64 % of the AREA of the AU

mean VOLUME % in entity 20.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

58
Page 5

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 1.09 % of the AREA of the AU

mean VOLUME % in entity 1.09

2. Private Lands is 62.12 % of the AREA of the AU

mean VOLUME % in entity 62.00

3. Tribal Lands is 27.38 % of the AREA of the AU

mean VOLUME % in entity 27.91

4. Other Lands is 0.37 % of the AREA of the AU

mean VOLUME % in entity 1.00

5. MT State Lands is 8.21 % of the AREA of the AU

mean VOLUME % in entity 7.00

6. ND State Lands is 0.83 % of the AREA of the AU

mean VOLUME % in entity 1.00

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

59
Page 6

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 0.12 % of the AREA of the AU

mean VOLUME % in entity 0.12

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 % of the AREA of the AU

mean VOLUME % in entity

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

60
Page 7

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

(continued)

11. US Fish and Wildlife Service (FWS) is 0.97 % of the AREA of the AU

mean VOLUME % in entity 0.97

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 0.00

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

61
Page 8

Assessment Unit (name, no.)

Northwest Transitional Continuous Oil, 50310165

Surface Allocations (uncertainty of a fixed value)

1. Northern Glaciated Plains (NGPL) is 55.85 % of the AREA of the AU

mean VOLUME % in entity 55.85

2. Northwestern Glaciated Plains (NWGL) is 44.15 % of the AREA of the AU

mean VOLUME % in entity 44.15

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO ECOSYSTEMS

62
Assessment-unit type:

Well type:

Major reservoir type (Choose one.):

Minimum EUR per well

Number of tested wells:

Number of tested wells with EUR > minimum:

Historic success ratio, tested wells (%)

Assessment-Unit Probability:

IDENTIFICATION INFORMATION

 INPUT DATA FORM FOR CONTINUOUS ACCUMULATIONS

(version 1.2, July 20, 2012)

NUMBER OF UNDRILLED WELLS WITH POTENTIAL FOR ADDITIONS TO RESERVES

CHARACTERISTICS OF ASSESSMENT UNIT

Table 8. Input parameters for the Three Forks Continuous Oil Assessment Unit (50310166), Bakken Total Petroleum System, Williston 

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]

 

63
Page 2

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

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

calculated mean 88 minimum 80 mode 90 maximum 95

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

calculated mean 0.222 minimum 0.18 median 0.22 maximum 0.275

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

calculated mean 43 minimum 10 mode 40 maximum 80

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

calculated mean 0.085 minimum 0.01 median 0.08 maximum 0.2

Oil assessment unit: minimum mode maximum

 Gas/oil ratio (cfg/bo) 760 960 1160

 NGL/gas ratio (bngl/mmcfg) 35 85 115

Gas assessment unit:

 Liquids/gas ratio (bliq/mmcfg)

UNCERTAINTY ABOUT AVERAGE COPRODUCT RATIOS FOR UNTESTED WELLS

SWEET SPOTS

ESTIMATED ULTIMATE RECOVERY (EUR) PER WELL

NON-SWEET SPOTS

(triangular)

64
Page 3

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

Oil assessment unit: minimum median maximum

 API gravity of oil (degrees) 34 41 50

 Sulfur content of oil (%) 0.01 0.1 1

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

2200 3250 3400

Gas assessment unit: minimum median maximum

 Inert-gas content (%)

 CO2 content (%)

 Hydrogen sulfide content (%)

 Heating value (BTU)

 Depth (m) of water (if applicable)

 Drilling depth (m) minimum F75 median F25 maximum

Completion practices:

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

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 1

SELECTED ANCILLARY DATA FOR UNTESTED WELLS

(no specified distribution type)

65
Page 4

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

Surface Allocations (uncertainty of a fixed value)

1. Montana is 25.18 % of the AREA of the AU

mean VOLUME % in entity 25.00

2. North Dakota is 74.82 % of the AREA of the AU

mean VOLUME % in entity 75.00

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

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO STATES

66
Page 5

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

Surface Allocations (uncertainty of a fixed value)

1. Federal Lands is 6.68 % of the AREA of the AU

mean VOLUME % in entity 7.00

2. Private Lands is 77.56 % of the AREA of the AU

mean VOLUME % in entity 78.00

3. Tribal Lands is 10.42 % of the AREA of the AU

mean VOLUME % in entity 10.00

4. Other Lands is 1.03 % of the AREA of the AU

mean VOLUME % in entity 1.00

5. MT State Lands is 1.85 % of the AREA of the AU

mean VOLUME % in entity 2.00

6. ND State Lands is 2.46 % of the AREA of the AU

mean VOLUME % in entity 2.00

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

67
Page 6

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

Surface Allocations (uncertainty of a fixed value)

1. Bureau of Land Management (BLM) is 0.46 % of the AREA of the AU

mean VOLUME % in entity 0.50

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 0.28 % of the AREA of the AU

mean VOLUME % in entity 0.30

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 3.14 % of the AREA of the AU

mean VOLUME % in entity 3.20

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

68
Page 7

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

(continued)

11. US Fish and Wildlife Service (FWS) is 1.05 % of the AREA of the AU

mean VOLUME % in entity 1.00

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 0.00

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 1.75 % of the AREA of the AU

mean VOLUME % in entity 2.00

20. is % of the AREA of the AU

mean VOLUME % in entity

ALLOCATIONS OF POTENTIAL ADDITIONS TO RESERVES TO FEDERAL LAND SUBDIVISIONS

69
Page 8

Assessment Unit (name, no.)

Three Forks Continuous Oil, 50310166

Surface Allocations (uncertainty of a fixed value)

1. Northeastern Glaciated Plains (NEGP) is 25.16 % of the AREA of the AU

mean VOLUME % in entity 25.16

2. Northern Glaciated Plains (NGPL) is 41.50 % of the AREA of the AU

mean VOLUME % in entity 41.50

3. Northwestern Glaciated Plains (NWGL) is 8.62 % of the AREA of the AU

mean VOLUME % in entity 8.62

4. Northwestern Great Plains (NWGP) is 24.66 % of the AREA of the AU

mean VOLUME % in entity 24.66

5. Powder River Basin (PRBA) is 0.07 % of the AREA of the AU

mean VOLUME % in entity 0.06

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 ECOSYSTEMS

70