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Walker Creek field is a stratigraphic trap containing 100 million bbl of oil and 100 Bcf of gas. The field lies
4 mi north of the Arkansas-Louisiana border in Columbia and Lafayette Counties, Arkansas. The trap is provided by the northern limit of a Smackover oolite facies which changes to equivalent Buckner shales and fine-grained limestones. The geologic model proposes that additional bar units, of slightly older geologic age, could be developed farther updip.
A new 7-mi (11 km) seismic line was recorded north-south across the field. Two displays of conventionally processed seismic data define a subtle amplitude feature at the apparent Walker Creek field limits. One seismic display contains data with a 10-55-Hz filter, and a broader band section, containing 0-110-Hz data, certainly adds to the trap definition.
Seislog (trademark of Teknika) inversion of these seismic data and detailed correlation of sonic logs to the Seislog line provide further definition of the facies geometry creating the amplitude feature. Definition of the updip limit of the 100 ft (30 m) of producing Smackover oolite is offered on the inverted seismic traces from 10, 800 ft (3,292 m; 2.1 sec).
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