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AAPG Bulletin, Preliminary version published online Ahead of Print 1 October 2022.

Copyright © 2022. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/09232220217

An Integrated Chemo- and Sequence Stratigraphic Analysis of Extended (>1000 ft) Lower Permian Wolfcamp Cores, Reagan County, Southern Midland Basin

Benjamin H. Richards, Matthew Wehner, Michael C. Pope, and Arthur D. Donovan

Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843-3115

Ahead of Print Abstract

Two 1000’+ (300 m) cores of Lower Permian (Wolfcampian) strata from Midland Basin, Texas were described bed-by-bed to establish an integrated lithostratigraphic, chemostratigraphic, and sequence stratigraphic framework. Ten lithofacies, where mudstones were defined as being finer than coarse silt in size, include: 1) dolostone, 2) floatstone, 3) graded skeletal grainstone, 4) graded skeletal wackestone and packstone, 5) graded calcisiltstone, 6) siliceous siltstone, 7) carbonate mudstone, 8) mixed siliceous-carbonate mudstone, 9) siliceous mudstone and 10) argillaceous mudstone. Using this framework, in conjunction with significant stratigraphic surfaces, four depositional sequences were identified and correlated between the two cores. Each sequence transitions up section from carbonate-rich intervals interpreted as lowstand deposits upward into siliceous mudstone beds where the dominant source of silica is biogenic, interpreted as pelagic transgressive to highstand deposits. This differs from the traditional deep-water reciprocal sedimentation model where quartz-rich strata are interpreted as lowstand deposits, and carbonate-rich strata are interpreted as transgressive to highstand deposits.

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Please cite this AAPG Bulletin Ahead of Print article as:

Benjamin H. Richards, Matthew Wehner, Michael C. Pope, Arthur D. Donovan: An Integrated Chemo- and Sequence Stratigraphic Analysis of Extended (>1000 ft) Lower Permian Wolfcamp Cores, Reagan County, Southern Midland Basin, (in press; preliminary version published online Ahead of Print 01 October 2022: AAPG Bulletin, DOI:10.1306/09232220217.

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