Revision History for FS 2018-3076

By Thomas M. Finn, Christopher J. Schenk, Tracey J. Mercier, Marilyn E. Tennyson, Phuong A. Le, Michael E. Brownfield, Kristen R. Marra, Heidi M. Leathers-Miller, Ronald M. Drake II, Cheryl A. Woodall, and Scott A. Kinney

Assessment of Continuous Oil and Gas Resources in the Niobrara Interval of the Cody Shale, Wind River Basin Province, Wyoming, 2018

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Posted online December 19, 2018

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Revised and reposted March 13, 2020, version 1.1

The following numbers have been revised. 

Page 1
528 million barrels of oil is now 389 million barrels of oil. 
2 trillion cubic feet of gas is now 1.8 trillion cubic feet of gas. 

Page 2

Table 1: Wind River Niobrara Shale Oil AU
Potential production area of assessment unit (acres)
Maximum: 1,977,000 changed to 1,264,000
Calculated mean: 897,000 changed to 659,333

Table 2: Wind River Niobrara Shale Oil AU
Oil (MMBO)
F95: 112 changed to 90
F50: 453 changed to 346
F5: 1,195 changed to 834
Mean: 528 changed to 389
Gas (BCFG)
F95: 104 changed to 90
F50: 441 changed to 336
F5: 1,247 changed to 870
Mean: 529 changed to 389
NGL (MMBNGL)
F95: 6 changed to 5
F50: 26 changed to 20
F5: 78 changed to 55
Mean: 32 changed to 23

Total Undiscovered Continuous Resources
Oil (MMBO)
F95: 112 changed to 90
F50: 453 changed to 346
F5: 1,195 changed to 834
Mean: 528 changed to 389
Gas (BCFG)
F95: 391 changed to 377
F50: 1,610 changed to 1,505
F5: 4,782 changed to 4,405
Mean: 1,971 changed to 1,831
NGL (MMBNGL)
F95: 7 changed to 6
F50: 31 changed to 25
F5: 102 changed to 79
Mean: 40 changed to 31

The following text was updated with revised numbers. 
Undiscovered Resources Summary
The USGS quantitatively assessed continuous oil and gas resources in the two delineated AUs (table 2) in the Niobrara interval of the Wind River Basin Province, Wyoming. For undiscovered, technically recoverable continuous oil and gas resources, the estimated mean totals are 389 million barrels of oil (MMBO) with an F95–F5 fractile range from 90 to 834 MMBO; 1,831 billion cubic feet of gas (BCFG), or
1.8 trillion cubic feet of gas, with an F95–F5 fractile range from 377 to 4,405 BCFG; and 31 million barrels of natural gas liquids (MMBNGL) with an F95–F5 fractile range from 6 to 79 MMBNGL.