Recognition on Wireline Logs and Mapping of Oolitic Facies in a Carbonate Sequence, Ste. Genevieve Limestone, Illinois Basin
William F. Bandy, Jr., 1993. "Recognition on Wireline Logs and Mapping of Oolitic Facies in a Carbonate Sequence, Ste. Genevieve Limestone, Illinois Basin", Mississippian Oolites and Modern Analogs, Brian D. Keith, Charles W. Zuppann
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Oolitic facies of the Ste. Genevieve Limestone are common and prolific hydrocarbon reservoirs in the Illinois basin. However, development and exploration efforts are often hampered by the inability to recognize the reservoir on wireline logs. A comparison of cores with wireline logs in northern Lawrence field, Lawrence County, Illinois, indicates that a subjective but predictable relationship exists between carbonate lithology and log character. Mapping of the oolitic facies to determine orientation, geometry, and extent can be accomplished in areas where wireline logs are the only data available.
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A coincidence of tectonic, eustatic, and geochemical conditions resulted in substantial deposits of oolitic limestone during later Mississippian time in the continental United States. These oolitic limestones have formed petroleum reservoirs with favorable primary and secondary recovery characteristics. Significant potential reserves in stratigraphic traps remain to be discovered and developed in these reservoirs.