New depositional model improves outlook for Clear Fork infill drilling

09/14/1998
Scott L. Montgomery Petroleum Consultant Seattle William H. Dixon Fina Oil and Chemical Co. Houston For over 30 years, the Clear Fork Group (Leonardian), a major reservoir interval of the Permian Basin with nearly 1 billion bbl of original oil in place, has been interpreted as an arid or semi-arid deposit. Thin-bedded, anhydrite-bearing dolostones of the Clear Fork have been deposited as the result of cyclic sedimentation in an evaporitic1 or, more specifically, a sabkha/salt pan-type setting.2 Until very recently, such models have gone unquestioned despite mounting evidence for more complex depositional origins. Important interpretations of the last few years, meanwh...
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