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Title: Breaking into Bakken potential on the Fort Peck reservation, northeastern Montana

Abstract

Necessary ingredients for a Bakken play involve overpressuring, thermal maturity, stratigraphic thinning, hydrocarbon content, and the presence of fractures to free the oil. Bakken thickness varies on the reservation from 0 to 25 m. The Upper Shale Member is uniformly 3-4 m. Thickness is related to a northwest structural grain, especially in the northeast where fold axes are located parallel to the Opheim syncline. This strike is coincident with the general salt solution edge of the Devonian Prairie Evaporites. The Bakken is about 16 m thick along this dissolution boundary and may contain the necessary fracturing. Structural flexure near the Wolf Creek Nose, and especially off the northeast and eastern flanks of the Poplar dome, may have suitably fractured the Bakken as well. Well logs in this area have good resistivity separation in the Middle Siltstone Member of the Bakken, which may be used to detect fracturing in this low-porosity reservoir. Present depth of the Bakken varies from about 2,100 to 3,050 m. Electrical resistivities indicate, however, that much of the reservation's Bakken was subjected to sufficient depths to generate hydrocarbons. Other physical properties, based on porosity and gamma-ray logs, confirm that organic carbon content is adequate, if not exceptionallymore » high. Regional and Laramide uplift, coupled with glacial erosion and rebound, probably explain the present elevation of the Bakken in this area. Significant overpressuring exists in the Bakken over at least half of the reservation as determined by sonic-log calculations and sparse drill-stem test pressures.« less

Authors:
;  [1]
  1. Fort Peck Tribes, Poplar, MT (United States)
Publication Date:
OSTI Identifier:
5791974
Report Number(s):
CONF-9107109-
Journal ID: ISSN 0149-1423; CODEN: AABUD
Resource Type:
Conference
Journal Name:
AAPG Bulletin (American Association of Petroleum Geologists); (United States)
Additional Journal Information:
Journal Volume: 75:6; Conference: American Association of Petroleum Geologists (AAPG) Rocky Mountain Section meeting, Billings, MT (United States), 28-31 Jul 1991; Journal ID: ISSN 0149-1423
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; MONTANA; PETROLEUM DEPOSITS; FRACTURED RESERVOIRS; PETROLEUM GEOLOGY; GEOLOGIC FORMATIONS; GEOLOGIC FRACTURES; GEOPRESSURED SYSTEMS; MATURATION; POROSITY; RESERVOIR ROCK; RESISTIVITY LOGGING; STRATIGRAPHY; DEVELOPED COUNTRIES; ELECTRIC LOGGING; FEDERAL REGION VIII; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; MINERAL RESOURCES; NORTH AMERICA; RESOURCES; USA; WELL LOGGING; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Monson, L M, and Lund, D F. Breaking into Bakken potential on the Fort Peck reservation, northeastern Montana. United States: N. p., 1991. Web.
Monson, L M, & Lund, D F. Breaking into Bakken potential on the Fort Peck reservation, northeastern Montana. United States.
Monson, L M, and Lund, D F. 1991. "Breaking into Bakken potential on the Fort Peck reservation, northeastern Montana". United States.
@article{osti_5791974,
title = {Breaking into Bakken potential on the Fort Peck reservation, northeastern Montana},
author = {Monson, L M and Lund, D F},
abstractNote = {Necessary ingredients for a Bakken play involve overpressuring, thermal maturity, stratigraphic thinning, hydrocarbon content, and the presence of fractures to free the oil. Bakken thickness varies on the reservation from 0 to 25 m. The Upper Shale Member is uniformly 3-4 m. Thickness is related to a northwest structural grain, especially in the northeast where fold axes are located parallel to the Opheim syncline. This strike is coincident with the general salt solution edge of the Devonian Prairie Evaporites. The Bakken is about 16 m thick along this dissolution boundary and may contain the necessary fracturing. Structural flexure near the Wolf Creek Nose, and especially off the northeast and eastern flanks of the Poplar dome, may have suitably fractured the Bakken as well. Well logs in this area have good resistivity separation in the Middle Siltstone Member of the Bakken, which may be used to detect fracturing in this low-porosity reservoir. Present depth of the Bakken varies from about 2,100 to 3,050 m. Electrical resistivities indicate, however, that much of the reservation's Bakken was subjected to sufficient depths to generate hydrocarbons. Other physical properties, based on porosity and gamma-ray logs, confirm that organic carbon content is adequate, if not exceptionally high. Regional and Laramide uplift, coupled with glacial erosion and rebound, probably explain the present elevation of the Bakken in this area. Significant overpressuring exists in the Bakken over at least half of the reservation as determined by sonic-log calculations and sparse drill-stem test pressures.},
doi = {},
url = {https://www.osti.gov/biblio/5791974}, journal = {AAPG Bulletin (American Association of Petroleum Geologists); (United States)},
issn = {0149-1423},
number = ,
volume = 75:6,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1991},
month = {Sat Jun 01 00:00:00 EDT 1991}
}

Conference:
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