Abstract

Oil produced from thin Lansing (Pennsylvanian) limestone beds at a depth of about 4,000 ft (1,200 m) in central Hitchcock County. Subtle oil accumulation; conventional subsurface studies have been of little value in explaining the oil accumulation. A method developed for evaluating thin Lansing reservoir beds that incorporates careful analysis of cuttings and logs of early vintage. This method facilitates mapping Lansing reservoir distribution, thereby permitting a better understanding of the subtle trap.--Modified journal abstract.

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