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High-Frequency Sequence Stratigraphy from Seismic Sedimentology: A Miocene Gulf Coast Example

By
Hongliu Zeng
Hongliu Zeng
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 e-mail: hongliu.zeng@beg.utexas.edu
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Tucker F. Hent
Tucker F. Hent
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 e-mail: tucker.hentz@beg.utexas.edu
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Published:
December 01, 2002

Abstract

For high-frequency (fourth-order) depositional sequences, seismic-stratigraphic interpretation of vertical seismic sections commonly generates equivocal sequence boundaries and systems tracts because of limited vertical seismic resolution. Extending well-based, high-frequency sequence stratigraphy into a 3-D seismic survey area consequently proves to be a major challenge. We show that critical to such extension is recognition and interpretation of plano-form geomorphology of depositional systems. Emphasis should be shifted from interpreting vertical seismic data to developing new tools capable of extracting more horizontal, seismic-sedimentologic information. This case study of the Vermilion Block 50-Tiger Shoal field area, offshore Louisiana, shows that proportional, stratal slicing between Miocene flooding surfaces provides sequential and accurate seismic imagery of depositional systems. This imagery in turn serves as a basis for recognizing and mapping high-frequency systems tracts, sequence boundaries, and sequences in a geologic-time domain. In the Miocene interval, all of the fourth-order sequences or sequence sets from study wells can be seismically mapped at a resolution equivalent to 10 m in thickness, which is necessary for accurate reconstruction of the high-frequency sequence-stratigraphic framework in the region of seismic coverage outside well control.

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Contents

GCSSEPM

Sequence Stratigraphic Models for Exploration and Production: Evolving Methodology, Emerging Models and Application Histories

John M. Armentrout
John M. Armentrout
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
22
ISBN electronic:
978-0-9836096-8-1
Publication date:
December 01, 2002

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