Integrated characterization of middle Bakken diagenesis, Williston Basin, North Dakota, U.S.A.
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Diagenetic calcite cements have a detrimental impact on reservoir properties within the Middle Member of the Bakken Formation. These cemented zones appear to have grown early in the post depositional history of the Middle Bakken. Hydrocarbon charge is significantly inhibited where calcite cements are present. This indicates that calcite cementation preceded the regional migration of hydrocarbons from the Upper and Lower Bakken Shale source rocks. In addition, the cements appear to have shielded large pore volumes from dolomitizing fluids, which inhibited reservoir enhancement. The integration ...