--> Abstract: Trapping Mechanisms in the Arbuckle Group Sediments of Eastern Major County, Oklahoma, by J. Heyer; #90994 (1993).

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HEYER, JEFFREY, Cross Timbers Oil Company, Fort Worth, TX

ABSTRACT: Trapping Mechanisms in the Arbuckle Group Sediments of Eastern Major County, Oklahoma

A new exploration play in Major County, Oklahoma, has discovered significant reserves of oil and gas in Ordovician Arbuckle sediments. Major County is located on the northern shelf of the Anadarko basin, and oil and gas have been produced in the county since 1945. The newly explored deeper structures are reflected by subtle structural reversals in the shallow sediments.

Arbuckle Group lithotypes are typically dolomitic grainstones and mudstones. Matrix-supported chaotic breccia and collapse breccia facies are present in the upper 170 ft of Arbuckle sediments. Unique to this play is an aphanic rhyolite that also produces oil and gas.

A horst and graben structural fabric is the primary trapping mechanism in the area. Within each horst block, structural reversals and stratigraphic pinch-outs further define reservoir geometry. The Mustang horst in T21N R10W illustrates the trapping mechanisms in the Arbuckle Group sediments. A facies change from a bioclastic grainstone to a very finely crystalline mudstone traps hydrocarbons in the DLB Energy Company 27-4 Cecil oil reservoir. A sucrosic microcrystalline dolomite that subcrops against Oil Creek shale is the trapping mechanism for the Continental Trend Resources 1-22 Mary Ellen gas reservoir. Porous Arbuckle dolomite juxtaposed to Oil Creek shale by a small normal fault traps hydrocarbons in the DLB Energy Company 28-9 Bierig. A structural reversal on the downthrown si e of a normal fault along with the facies change from a collapse breccia to a matrix-supported chaotic breccia traps hydrocarbons in the Continental Trend Resources 1-34 Terry.

AAPG Search and Discovery Article #90994©1993 AAPG Southwest Section Meeting, Fort Worth, Texas, February 21-23, 1993.