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National Assessment of Oil and Gas Fact Sheet

Assessment of Undiscovered Oil and Gas Resources of the Powder River Basin Province of Wyoming and Montana, 2002

Table 1. Powder River Basin Province assessment results.
[MMBO, million barrels of oil; BCFG, billion cubic feet of gas; MMBNGL, million barrels of natural gas liquids. Results shown are fully risked estimates. For gas fields, all liquids are included under the NGL (natural gas liquids) category. F95 denotes a 95-percent chance of at least the amount tabulated. Other fractiles are defined similarly. Fractiles are additive under the assumption of perfect positive correlation. CBG, coal-bed gas. Play assessments are from Dolton and Fox (1996). Gray shading indicates not applicable (N / A)]
Total undiscovered resources


Conventional Oil and Gas Resources
Total Petroleum Systems (TPS)
and Assessment Units (AU)		 Field
type

Oil (MMBO)
F95 F50 F5 Mean

Gas (BCFG)
F95 F50 F5 Mean

NGL (MMBNGL)
F95 F50 F5 Mean
Basin-Margin Subthrust Play (1996)
Oil
0.00
0.00
113.00
20.10
0.00
0.00
113.00
20.10
0.00
0.00
3.39
0.60
Basin-Margin Anticline Play (1996)
Oil
1.30
5.50
16.50
6.80
0.78
3.30
9.90
4.08
0.02
0.10
0.30
0.12
Leo Sandstone Play (1996)
Oil
0.00
50.90
261.40
81.40
0.00
3.05
15.68
4.88
0.00
0.00
0.00
0.00
Upper Minnelusa
Sandstone Play (1996)
Oil
38.20
247.70
1,055.20
522.30
2.29
14.86
63.31
31.34
0.00
0.00
0.00
0.00
Lakota Sandstone Play (1996)
Oil
2.80
23.30
126.40
53.80
1.12
9.32
50.56
21.52
0.08
0.65
3.54
1.51
Fall River Sandstone Play
Oil
16.20
127.30
408.10
192.40
9.72
76.38
244.86
115.44
0.68
5.35
17.14
8.08
Muddy Sandstone Play (1996)
Oil
Gas
3.50
28.40
118.40
59.10
N / A
N / A
N / A
N / A
10.50
85.20
355.20
177.30
22.40
155.50
574.30
271.80
0.74
5.96
24.86
12.41
1.34
9.33
34.46
16.31
Deep Frontier
Sandstone Play (1996)
Oil
4.80
36.50
105.00
48.30
19.20
146.00
420.00
193.20
0.96
7.30
21.00
9.66
Turner Sandstone Play (1996)
Oil
2.80
16.20
37.50
21.10
4.20
24.30
56.25
31.65
0.53
3.04
7.03
3.96
Sussex-Shannon
Sandstone Play (1996)
Oil
5.90
50.60
148.10
67.80
4.72
40.48
118.48
54.24
0.38
3.24
9.48
4.34
Mesaverde-Lewis Play (1996)
Oil
5.20
43.30
124.20
58.10
5.20
43.30
124.20
58.10
0.36
3.03
8.69
4.07
Eastern Basin Margin Upper
Ft. UnionSandstone AU
Gas
N / A
N / A
N / A
N / A
0.00
0.00
107.43
27.37
0.00
0.00
0.00
0.00
Total Conventional
Resources
80.70
629.70
2,513.80
1,131.20
80.13
602.01
2,253.35
1,011.02
5.09
38.00
129.89
61.06


Continuous Oil and Gas Resources
Total Petroleum Systems (TPS)
and Assessment Units (AU)		 Field
type

Oil (MMBO)
F95 F50 F5 Mean

Gas (BCFG)
F95 F50 F5 Mean

NGL (MMBNGL)
F95 F50 F5 Mean
Tertiary-Upper Cretaceous
Coal-Bed Methane TPS
Wasatch Formation AU
CBG
N / A
N / A
N / A
N / A
1,011.94
1,815.71
3,257.89
1,934.09
0.00
0.00
0.00
0.00
Upper Fort Union Formation AU
CBG
N / A
N / A
N / A
N / A
7,232.13
11,635.87
18,721.10
12,132.50
0.00
0.00
0.00
0.00
Lower Fort Union-Lance
Formation AU
CBG
N / A
N / A
N / A
N / A
0.00
171.67
440.90
197.90
0.00
0.00
0.00
0.00
Mowry TPS
Mowry Continuous Oil AU
Oil
116.99
189.32
306.38
197.61
103.35
185.50
332.95
197.61
5.56
10.91
21.37
11.86
Niobrara TPS
Niobrara Continuous Oil AU
Oil
135.53
217.49
349.03
226.67
119.54
213.10
379.87
226.67
6.43
12.53
24.40
13.60
Cretaceous Biogenic Gas TPS
Shallow Continuous
Biogenic Gas AU
Gas
N / A
N / A
N / A
N / A
341.92
712.15
1,483.26
786.64
0.00
0.00
0.00
0.00
Total Continuous
Resources
 
252.52
406.81
655.41
424.28
8,808.88
14,734.00
24,615.97
15,475.41
11.99
23.44
45.77
25.46
Total Undiscovered
Oil and Gas Resources
 
333.22
1,036.51
3,169.21
1,555.48
8,889.01
15,336.00
26,869.32
16,486.43
17.08
61.44
175.66
86.52
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