Show simple item record Pollastro, Richard M. Roberts, Laura N.R. Cook, Troy A. 2014-04-03T18:04:49Z 2014-04-03T18:04:49Z 2013
dc.identifier.citation Pollastro, R.M., Roberts, L.N.R., and Cook, T.A., 2013, Geologic assessment of technically recoverable oil in the Devonian and Mississippian Bakken Formation, chap. 5 of U.S. Geological Survey Williston Basin Province Assessment Team, Assessment of undiscovered oil and gas resources of the Williston Basin Province of North Dakota, Montana, and South Dakota, 2010 (ver. 1.1, November 2013): U.S. Geological Survey Digital Data Series DDS–69–W, 34 p en_US
dc.description Chapter 5 of 7 Assessment of Undiscovered Oil and Gas Resources of the Williston Basin Province of North Dakota, Montana, and South Dakota, 2010 Courtesy of U.S. Geological Survey. Online document can be found at en_US
dc.description.abstract The Upper Devonian and Lower Mississippian Bakken Formation in the U.S. portion of the Williston Basin is a giant continuous (unconventional) oil resource. A recent U.S. Geological Survey assessment estimated a mean volume of undiscovered technically recoverable oil for the Bakken Formation at about 3.65 billion barrels of oil. The estimate is based on a geologic model and a methodology that defines different assessment units by accumulation type (conventional or continuous), structural control, fracture occurrence and prediction, lithology and petrophysical properties, formation thickness, underlying salt movement or dissolution, and level of thermal maturity and oil-generation capacity of Bakken source rocks. The Bakken Formation consists of three informal members: (1) lower shale member, (2) middle sandstone member, and (3) upper shale member. The lower and upper shale members are rich in marine organic matter (as much as 35 percent by weight) and are the petroleum source rocks, whereas the middle sandstone member varies in depositional facies and lithology and locally exhibits good matrix porosity (as much as 14 percent) but with low permeability characteristic of tight reservoirs. Additional commingled production occurs locally from matrix porosity in the immediately underlying Sanish sand unit (informal name) of the Upper Devonian Three Forks Formation. Combined, the Bakken Formation and Sanish sand define the “Bakken composite continuous reservoir.” On a larger scale, thermally mature, organic-rich Bakken shale members also source oils produced from locally occurring Waulsortian mounds or porous strata immediately above the upper shale member in the overlying Lower Mississippian Lodgepole Limestone. As a whole, elements of petroleum source, reservoir, seal, migration, and trap define the stratigraphic and geographic character of a Bakken-Lodgepole Total Petroleum System. The geographic extent of the continuous oil accumulation within the U.S. portion of the Bakken Formation is defined as the area in which the organic-rich shale members are thermally mature with respect to oil generation. The area of the oil-generation window for the Bakken continuous reservoir was determined using a combination of the following: (1) contour mapping of both the hydrogen index (HI) and log-resistivity well data of the upper shale member, (2) calibration of HI to the transformation ratio from one-dimensional burial history models, and (3) calibration of HI to total organic content. The area of the oil-generation window was divided into five continuous assessment units: (1) Elm Coulee-Billings Nose, (2) Central Basin-Poplar Dome, (3) Nesson-Little Knife Structural, (4) Eastern Expulsion Threshold, and (5) Northwest Expulsion Threshold. One hypothetical conventional assessment unit, the Middle Sandstone Member, was defined external to the area of oil generation. en_US
dc.language.iso en en_US
dc.publisher U.S. Geological Survey, Reston, Virginia en_US
dc.relation.ispartofseries U.S. Geological Survey Digital Data Series;DDS-69-W
dc.subject geologic assessment en_US
dc.subject recoverable oil en_US
dc.subject devonian en_US
dc.subject Mississippian Bakken Formation en_US
dc.subject Souris River en_US
dc.subject Lake Winnipeg Basin en_US
dc.subject North Dakota en_US
dc.subject Montana en_US
dc.subject South Dakota en_US
dc.title Chapter 5 Geologic Assessment of Technically Recoverable Oil in the Devonian and Mississippian Bakken Formation en_US
dc.type Book chapter en_US

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