Abstract
In the Halverson Field area of the eastern Powder River Basin, oil is trapped in porous Minnelusa reservoirs by the Opeche Shale. This study indicates that the Opeche can be divided into two vertical units which were deposited in different environments and that the nature of the contact between the Minnelusa and Opeche is different for the two environments. The lower Opeche was deposited in a channel-fill environment and is in unconformable contact with the Minnelusa, whereas the upper Opeche was deposited in a marine or marginal marine environment and is in conformable contact with the Minnelusa. A paleo-high controlled the area of major facies change. The different environments of the Opeche should lead to different mapping techniques of the two shale units in the exploration for new Minnelusa oil fields.
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