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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Base of the Permian in Midland and Delaware Basins From Logs
Abstract
Although the base of the Permian is now generally agreed to be the base of the Schwagerina zone, fusulinids are not available across the contact in the centers of the deep basins. The sea there was too deep during the Late Pennsylvanian for them to live, and too far beyond the slopes for their transported shells to reach. Out past the belt of turbidites the rapidly deposited shale of the basal Wolfcamp and the slowly deposited shale of the Upper Pennsylvanian are not easily distinguished in rotary cuttings. Gamma ray, resistivity, neutron, density, and sonic logs show that the Pennsylvanian shale contains readily correlatable members of radioactive, organic, black shale; the Wolfcamp lacks such shale.
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