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Geophysical Case History of South Centrahoma Prospect, Coal County, Oklahoma

Frank X. Schloeder

The South Centrahoma prospect is an Previous HitexampleNext Hit of the successful use of aeromagnetic Previous HitdataNext Hit in locating basement-controlled structures in mature exploration areas. Although commercial hydrocarbons were not found, the test well did confirm a positive structure that had been undetected during 50 years of development of the adjacent Centrahoma Previous HitfieldNext Hit.

In late 1983, Clyde Petroleum commissioned Borehole Exploration Corporation to acquire, process, and interpret 430 line-mi of "high-resolution" aeromagnetic Previous HitdataNext Hit in Coal County, Oklahoma. From this survey, nine prospective leads were identified. The South Centrahoma prospect, due south of the Centrahoma Previous HitfieldNext Hit, is on the downthrown side of a major left-lateral strike-slip fault system that is expressed on aeromagnetic Previous HitdataNext Hit. The adjacent Centrahoma Previous HitfieldNext Hit, in the Franks graben of Coal County, Oklahoma, has produced 3.4 million bbl of oil and 93.5 bcf of gas from six different reservoirs, ranging from the Ordovician Oil Creek through the Pennsylvanian Booch. This Previous HitfieldNext Hit is a cross-faulted anticline that is expressed as a surface structure, and for this reason probably attracted the Carter Oil Company to drill in 1937.

Clyde Petroleum pursued a typical evaluation process for the prospect, including the purchasing and reprocessing of both Singlefold (100%) and modern CDP seismic Previous HitdataNext Hit. These purchased Previous HitdataNext Hit hinted at a prospect where the original aeromagnetic Previous HitdataNext Hit had suggested, but were inconclusive. Two detail seismic lines were acquired. These modern Previous HitdataNext Hit confirmed a positive high-relief structure similar to that shown on the aeromagnetic Previous HitdataTop. Closure ranged from 100 ft at the shallow Gilcrease sandstone to 250 ft at the Hunton Limestone.

Clyde Petroleum drilled the Goss 1-3 in NW ¼ NW ¼, Sec. 1, T1N, R9E, to a depth of 8,500 ft. The Goss well confirmed the structure, but found no commercial hydrocarbons. Some expected porosity zones were not present, some were wet, and the deeper zones were complexly faulted. Perhaps this faulting explains the lack of a trapping mechanism.

AAPG Search and Discovery Article #91039©1987 AAPG Mid-Continent Section Meeting, Tulsa, Oklahoma, September 27-29, 1987.