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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions Vol. 58 (2008), Pages 135-141

Three-Dimensional Architecture of Lowstand Incised-Valley Deposits in the Woodbine Group, Northern East Texas Field

Florence L. Bonnaffé, William A. Ambrose, Tucker F. Hentz, Fred P. Wang, and Robert G. Loucks

Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713-8924


Analysis of closely spaced wireline logs and 1500 ft (>450 m) of whole cores from five wells within the Upper Cretaceous (Cenomanian) lower Woodbine Group in the northern part of East Texas Field, reveals complex sandstone-body architecture. This study focuses on a 12.25-mi2 (31.7-km2) north pilot area (NPA), where lowstand, coarsegrained, bedload fluvial deposits truncate an underlying succession of fluvial-dominated highstand deltaic deposits.

Two distinct depositional systems comprising significant sandstone bodies are recognized in the NPA. The lower interval is composed of a highstand, fluvial-dominated, deltaic depositional succession with a depositional framework defined by dip-elongate distributary-channel sandstones. The upper interval consists of a lowstand incisedvalley- fill succession composed of multistoried, coarse-gravel conglomerate and coarsegrained sandstone beds that truncate more than 100 ft (>30 m) of the highstand interval. Recognition of the size, shape, and distribution of sandstone bodies allows for assessment of reservoir compartmentalization and the analysis of fluid-flow pathways that can provide a geological framework for identifying potential unswept mobile oil in the East Texas Field.

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