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Hydrocarbon Potential

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Title: Hydrocarbon Potential


1
Hydrocarbon Potential of the Bakken
Formation, North Dakota Julie A. LeFeverNorth
Dakota Geological Survey
Geologic Investigation No. 15
2
Williston Basin
Canada
Richland County
Study Area North Dakota Montana
ND
SD
MT
3
Middle Member of the Bakken
Canada
MT
ND
4
Richland County, MTStratigraphy
North
South
Mississippian Lodgepole Formation
Upper Shale Member
Transitional Facies L5
Upper (Productive)
Mississippian Bakken Formation
Lithofacies 2
DevonianThree Forks
Lower
Transitional Facies - L1
Lower Shale Member
5
Balcron Oil - 44-24 VairaSESE Sec. 24, T.24N.,
R.54E.
GR
Density Porosity
Lodgepole Fm.
10000
upper
Bakken Fm.
middle
Three Forks Fm.
Neutron Porosity
6
Bakken Middle Member Montana Porosity Zone
Prairie Salt
Montana
North Dakota
7
Canada
Canada
Bakken Play In North Dakota
Divide
Burke
Bottineau
Renville
Williams
Mountrail
McHenry
Ward
Montana
McKenzie
McLean
Northern Play
Dunn
Oliver
Billings
Stark
Southern Play
8
SENW Sec. 11, T160N, R95W Conoco, Inc. - 17
Watterud A
GR
Res
Lithofacies 3
Central Basin Facies
Upper L2
9
Lithofacies 3 Sandstone
CANADA
Index Map
Montana
10
Middle Member Bakken Play
  • Richland County, MT
  • Two laterals to a 1280 spacing unit
  • Well is stimulated with large fracture treatment
  • 920,000, gelled water/sand frac
  • 500-700 BOPD initially
  • Virtually no water
  • Production
  • 2000 2,618,982 BO
  • 2003 5,284,378 BO
  • 2004 12,849,141 BO

11
  • North Dakota
  • One to two laterals 640 to 1280 spacing unit
  • Well is stimulated with large fracture treatment
  • 6 wells off tight hole
  • IPs
  • L3 Lithofacies
  • 87 to 140 BOPD 130 to 150 MCF 125 to 142 BWPD
  • L2 Lithofacies
  • 41 to 263 BOPD 42 to 177 MCF 0 to 27 BWPD

12
Middle Bakken Reservoir
13
Middle Member Bakken Porosity
  • Matrix porosity
  • Primary
  • Secondary
  • Fracture porosity
  • Related to Tectonics
  • Regional
  • Salt tectonics
  • Related to HC Generation

14
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15

16
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17
Tectonic FracturingSalt Dissolution
Canada
  • Complete or Partial Dissolution of the Prairie
    Salt
  • Depositional Edge
  • Overlying Basement Structures
  • Other Geologic Features

Upper Shale
Middle Member
Montana
Lower Shale
Bakken Limits
Prairie Salt Isopach
18
Regional Fractures
Canada
Antelope Structure
?
Lower Bakken Shale
?
Montana
Heart River Fault
?
19
(No Transcript)
20
Upper Bakken Shale
SWSW Sec. 5, T43N, R99W Texaco, Inc - 1-5
Thompson
Canada
HF/E
M
VF/E
Montana
North Dakota
21
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22
10427 ft
Upper Bakken Shale
10440 ft
Lithofacies 4
23
10446 ft
Lithofacies 3
10451 ft
Central Basin Facies
24
10456 ft
Upper Lithofacies 2
10462 ft
Lower Lithofacies 2
25
Conclusions
  • Lithofacies are present basinwide
  • Primary reservoir porosity may be enhanced by
    diagenesis, tectonic fractures, and/or fractures
    from HC generation
  • Porosity enhancement is not restricted to a
    single lithofacies within the Middle Member

26
Conclusions
  • The presence of vertical fractures in areas of
    intense HC generation may affect the outcome of
    stimulation treatment.
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