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Abstract

Detailed geologic mapping of the Pennsylvanian Jackfork Group turbidites in the DeGray Lake area of Arkansas has provided a 3-D geologic model of a mile-long, steeply dipping turbidite succession that is separated into east and west fault blocks by a zone of strike-slip faults. By scaling-up the stratigraphy into four reservoir zones and by choosing two topographic ground surface elevations to represent an unconformity top-seal and an oil-water contact, this outcrop can be considered a pseudoturbidite “reservoir,” amenable to production simulation.

“Reservoir” performance simulation was conducted in 3-D, three-phase black oil mode, using vertical- and horizontal-well drilling scenarios for both water drive and depletion drive cases. The results demonstrate the ability to perform simulation on an outcrop to visualize, directly examine, and, hence, better understand the geologic controls on the performance of analog oil and gas reservoirs.

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