--> Abstract: Reassessment of Undiscovered Resources in the Bakken Formation, Williston Basin, North Dakota and Montana, by Gaswirth, Stephanie; Marra, Kristen; Cook, Troy; #90163 (2013)
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Reassessment of Undiscovered Previous HitResourcesNext Hit in the Bakken Formation, Williston Basin, North Dakota and Montana

Gaswirth, Stephanie; Marra, Kristen; Cook, Troy

The U.S. Geological Survey (USGS) is reassessing the undiscovered, technically recoverable oil and gas Previous HitresourcesNext Hit of the U.S. Williston Basin in the Devonian-Mississippian Bakken Formation in North Dakota and Montana. The Bakken Formation was last assessed by the USGS in Previous Hit2008Next Hit, and required a revaluation due to improved geologic knowledge of the Bakken Formation, as well as production information related to the substantial increase in the number of Bakken wells since Previous Hit2008Next Hit.

In Previous Hit2008Next Hit, five Previous HitunconventionalNext Hit (continuous) assessment units and one conventional assessment unit (AU) were defined for the Bakken Formation. These AU lines were based on structural elements, source rock maturity of the Upper Bakken Shale, and resistivity data. For Previous HitunconventionalNext Hit oil Previous HitresourcesNext Hit, the USGS estimated a total mean resource of 3.65 BBO, and 4 MMBO for conventional Previous HitresourcesNext Hit.

The reassessment of the Bakken Formation redefines the AUs based on updated thermal maturity data, structural controls, and the mapped extent of Bakken source rocks. Continuous assessment units are refined given a large amount of new production data since Previous Hit2008Next Hit, especially in the areas of the central basin, northeast Montana, and northwest North Dakota. The Parshall and Sanish fields have also been substantially developed since Previous Hit2008Next Hit, providing longer production histories and more robust estimated ultimate recovery (EUR) data. The new estimation of undiscovered technically recoverable Previous HitresourcesTop for the redefined Bakken Formation AUs will be completed in 2013.


AAPG Search and Discovery Article #90163©2013AAPG 2013 Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013