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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Shale Tectonics Controlled Depositional History, Eocene Wilcox Group, Central South Texas Coast
Abstract
Tectonic and stratigraphic architecture of the Wilcox Group along the central coastal plain of Texas (Bee/Goliad region) defines a series of growth fault–controlled subbasins similar to those in the Frio Formation in the Corpus Christi region, South Texas. A seismic sedimentologic study was performed to map higher-order (fourth- and fifth-order) systems tracts in a 2500-km2 3D seismic survey. Guided by third-order sequence-stratigraphic correlations from seismic and sparse core and wireline-log data, we prepared stratal-slice maps to reveal high-resolution (10-m scale) sediment-dispersal patterns and associated systems tracts in a relative geologic-time domain, particularly in third-order lowstand subbasins. Recognized depositional systems include (1) incised valleys and relict on-shelf deltas on an exposed shelf; (2) lowstand prograding deltaic systems composed of lobate deltaic sandstone bodies at the shelf edge; and (3) fault-controlled, off-shelf slope fans best characterized by point-source, fanlike channel/levee systems. Sand-dispersal patterns are controlled primarily by accommodation resulting from rollover topography associated with growth faulting initiated by shale-ridge movement. A sequential display of stratal slices reveals how the depositional systems responded to accommodation controlled by shale tectonics.
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