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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/09232220217
An integrated chemostratigraphic and
sequence
stratigraphic
analysis
of extended (>1000 ft) lower Permian Wolfcamp cores, Reagan County, southern Midland Basin
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Benjamin H. Richards,1 Matthew Wehner,2 Michael C. Pope,3 and Arthur D. Donovan4
1Department of Geology and Geophysics, Texas A&M University, College Station, Texas; [email protected]; [email protected]
2Department of Geology and Geophysics, Texas A&M University, College Station, Texas; [email protected]
3Department of Geology and Geophysics, Texas A&M University, College Station, Texas; [email protected]
4Department of Geology and Geophysics, Texas A&M University, College Station, Texas; [email protected]
Abstract
Two cores of more than 1000 ft (300 m) 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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