Mid-Continent Section

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Core-Calibrated Stratigraphic Architecture and Facies Distribution of the Colony Granite Wash, Anadarko Basin, Oklahoma


Desmoinesian-age deposits of the Colony Granite Wash in the Anadarko Basin, southwestern Oklahoma, exhibit a complex stratigraphic architecture along a proximal-to-distal (south to north) transect. Highly discontinuous, chaotic conglomeratic and sandy debris flow, proximal facies change distally to facies containing laterally continuous, cyclic turbidite successions. The Colony Granite Wash consists of three conglomerate and sandstone-rich stratigraphic intervals that are each bounded by laterally extensive mudstones. These clastics have igneous and sedimentary clasts eroded from the uplifted Amarillo-Wichita ancient mountain front, deposited as a series of coalescing alluvial fans to fan deltas on the shelf. Sediments were transported in submarine canyons (channel-fill, levee, debris flows and slumps), spreading distally to sheet-like and compensating beds on the basin floor. The result is a highly variable lithofacies association consisting of diverse reservoir-rock properties. The stratigraphic, sedimentologic, and reservoir characteristics of the Colony Granite Wash are established based on a detailed examination of cores, thin sections, and well logs. Wireline-log response is calibrated to detailed lithofacies descriptions from core to establish a rock-type model and to estimate lithology logs in non-cored wells. The lithology is used to condition 3D facies models of the Granite Wash that show the distribution of the stratigraphic architecture and lithofacies.