New depositional model improves outlook for Clear Fork infill drilling

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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