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Development of structure and porosity at Medicine Lake Field in northeast Montana, Williston basin

Conference · · Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:6432981
;
Medicine Lake field produces oil from the Mississippian Charles, Devonian Winnipegosis, Silurian Interlake, and Ordovician Gunton and Red River formations, and drill-stem tests show a potential for production from the Devonian Nisku and Deperow Formations. Porosity in the field is the result of bioclastic bank development, dolomitization, solution, and fracturing. Porosity development in the Winnipegosis and Red River Formations may have been influenced by the Medicine Lake paleostructure. The source of the oil in each of the producing formations is probably within that formation itself. The Medicine Lake structure is roughly elliptical, 1 mi (1.6 km) in diameter, and has 125 ft (38 m) of structural closure at the top of the Red River formation. Growth of the structure was essentially complete by the end of the Devonian. However, a similar structure at nearby Outlook field can be mapped from Paleocene outcrops, which shows that structural movement there continued into the Cenozoic. The configuration of Cambrian and Precambrian rocks at Medicine Lake shows that the structure there formed by compaction of Cambrian sediments deposited around a hill on the Precambrian land surface. Regional-scale southeast-plunging anticlines in the eastern Montana Williston basin may also have formed by compaction of Cambrian sediments on a differential eroded Precambrian land surface.
OSTI ID:
6432981
Report Number(s):
CONF-8309274-
Conference Information:
Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 67:8
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
FEDERAL REGION VIII
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MINERAL RESOURCES
MONTANA
NORTH AMERICA
OIL FIELDS
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
SEDIMENTARY BASINS
SOURCE ROCKS
USA