Silica diagenesis and its pore-scale influence on the characteristics of the upper and lower Bakken shales, Williston Basin, North Dakota and Montana
The Bakken Formation has been a major producer of oil and gas in North Dakota and Montana since the advent of horizontal drilling, reaching peak production of over 1.2 million barrels of oil per day. It is Late Devonian and Early Mississippian in age and consists primarily of a dolomitic reservoir member stratigraphically bounded by an upper and a lower organic-rich mudrock member. These bounding shales have been interpreted as depositional sequences of transgression and regression related to eustatic sea level variations and serve as important source rocks in the Williston Basin. The lower and ...
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