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National Assessment of Oil and Gas Fact Sheet

Assessment of Undiscovered Oil and Gas Resources of the Montana Thrust Belt Province, 2002

Table 1. Montana Thrust Belt 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. 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
Paleozoic/
Mesozoic Composite TPS
Thrust Belt Gas AU
Gas
N / A
N / A
N / A
N / A
783.40
4,857.60
13,772.70
5,761.40
17.10
109.20
331.80
133.60
Sawtooth Range Structure Gas AU
Gas
N / A
N / A
N / A
N / A
88.80
655.20
1,963.70
794.50
2.00
14.70
47.20
18.40
Frontal Structures Oil and Gas AU
Oil
Gas
1.70
5.70
14.90
6.70
N / A
N / A
N / A
N / A
6.20
22.30
61.80
26.70
135.50
963.90
2,901.10
1,165.30
0.30
1.10
3.20
1.30
6.60
48.40
153.90
60.30
Central Montana Trough
Paleozoic Composite TPS
Helena Salient Gas AU
Gas
N / A
N / A
N / A
N / A
67.80
517.80
1,627.90
638.50
1.50
12.00
40.40
15.30
Blacktail Salient
Paleozoic Composite TPS
Blacktail Salient Gas AU
Oil
1.30
4.70
12.00
5.40
3.70
13.70
37.70
16.30
0.20
0.70
2.00
0.80
Tertiary Lacustrine
Shale TPS
Tertiary Basisns Oil AU
Oil
8.80
58.20
164.60
68.80
15.10
101.50
309.30
124.10
0.50
3.60
11.50
4.50
Total Conventional
Resources
11.80
68.60
191.50
80.90
1,100.50
7,132.00
20,674.20
8,526.80
28.20
189.70
590.00
234.20


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
Bakken Formation TPS
Bakken Continuous Oil
Oil
Not quantitatively assessed
Marias River ShaleTPS
Marias River Shale Continuous Oil
Oil
12.90
25.50
50.60
27.90
46.80
100.10
214.30
111.40
2.10
4.90
11.30
5.60
Jurassic/Cretaceous TPS
Jurassic/Cretaceous Coal-Bed Gas
CBG
Not quantitatively assessed
Total Continuous
Resources
 
12.90
25.50
50.60
27.90
46.80
100.10
214.30
111.40
2.10
4.90
11.30
5.60
Total Undiscovered
Oil and Gas Resources
 
24.70
94.10
242.10
108.80
1,147.30
7,232.10
20,888.50
8,638.20
30.30
194.60
601.30
239.80
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