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Late Quaternary Shelf-Margin Delta and Slope-Fan Complexes of the East Texas–Western Louisiana Margin: Variable Response to Eustasy and Sediment Supply

By
John B. Anderson
John B. Anderson
Department of Earth Science Rice University Houston, Texas, 77251-1892
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Julia Wellner
Julia Wellner
Department of Earth Science Rice University Houston, Texas, 77251-1892
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Ken Abdulah
Ken Abdulah
ConocoPhillips PR 3028, P.O. Box 2197 Houston, Texas, 77252-2197
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Sabrina Sarzalejo
Sabrina Sarzalejo
Intevep Caracas, Venezuela
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Published:
December 01, 2013

Abstract

During the previous glacial-eustatic fall, the ancestral Brazos and western Louisiana rivers, which flowed across low gradient coastal plains and shelves, constructed large fluvial-dominated deltas that extend to the shelf margin. These rivers shifted to new locations prior to the lowstand, resulting in shelf-margin deltas that have no associated down-dip lowstand deltas or fans. The Trinity and Colorado rivers remained fixed in their locations throughout the eustatic fall and lowstand, resulting in linked valley/delta/fan complexes. Re-incision of lowstand valleys by these rivers over several eustatic cycles resulted in significant sediment bypass to the slope.

Factors that influenced the response of rivers to falling sea level include long-term sediment supply, diapiric controls on channel location, and the physiography of the shelf over which the rivers flowed.

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GCSSEPM

Shelf Margin Deltas and Linked Down Slope Petroleum Systems–Global Significance and Future Exploration Potential

Harry H. Roberts
Harry H. Roberts
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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Richard H. Fillon
Richard H. Fillon
Houston, Texas
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John B. Anderson
John B. Anderson
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
23
ISBN electronic:
978-0-9836096-7-4
Publication date:
December 01, 2013

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