The Cole Creek field is located in the western margins of the Powder River Basin about 15 miles north east of Casper in T 35 N and R 77 W. Discovered in 1935 it has produced from the Cretaceous horizons, the Shannon, Frontier, Muddy, Lakota and Dakota sandstones. This paper discusses the potential remaining in the Dakota Channel sands running across the south eastern nose of the structure. The Dakota has only been produced from two areas in the reservoir, the first being the poorer quality sands on the crest of the structure and the second being the so called channel sands on the southern nose which was partly developed because the productivity of the Dakota wells was higher in that area. It was not clear whether these channel sands are in communication with the crestal sands or whether there are several separate Dakota reservoirs around the structure. The Cole Creek field is principally a structural trap but to understand the reservoir it is important to determine to what extent stratigraphy and hydrodynamics plays a part in the Dakota trapping mechanisms. In this paper i examine the geology, production trends, pressure, rock and fluid data in order to determine the initial oil in place, recovery factors, drive mechanism, and ares of bypassed oil, all of which will shed light on the future potential of the reservoir. It is hoped that all of this data will then be used in a reservoir simulation study to quantify the development potential of the reservoir.

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