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Stratigraphy and Geologic History of
Jurassic Rocks, Northeastern
Gulf of Mexico1
Laura M. Dobson2
and Richard T. Buffler3
A grid of two-dimensional seismic
data tied to exploration wells defines four Jurassic sequences in the northeastern
Gulf of Mexico. These sequences correlate with well-known northern Gulf
of Mexico basin stratigraphic units: the Louann Salt (L sequence), Norphlet
and Smackover formations (N-S sequence), Haynesville Formation (H sequence),
and Cotton Valley Group (C sequence). The Jurassic section overlies a basement
surface characterized by broad highs (Middle Ground arch and Southern platform)
and lows (Apalachicola basin and Tampa embayment). This basement structure
controlled the distribution, thickness, and paleogeography of all the Jurassic
sequences, but its influence became progressively less pronounced as sediment
filled the basin.
The Jurassic geologic history of the region
is developed from an interpretation of these sequences. Well control documents
the presence of Louann Salt in the Apalachicola basin, whereas in the Tampa
embayment the interval is interpreted
1997. The American Association of Petroleum Geologists. All rights reserved.
received February 24, 1995; revised manuscript received February 15, 1996;
final acceptance August 13, 1996.
Columbia Drive, Cedar Falls, Iowa 50613.
University of Texas Institute for Geophysics, 8701 North MoPac Expressway,
Austin, Texas 78759.
study was conducted as partial fulfillment of the requirements for a Master
of Arts degree in Geological Sciences, which was received by Laura M. Dobson
in August 1990 at the University of Texas at Austin. We would like to thank
Amos Salvador and Joel Watkins for serving as committee members. We thank
Charles Bowen of Petty-Ray Geophysical Division, Geosource Inc. (now Halliburton
Geophysical Services), John Hood, formerly of Digicon Geophysical Company
Inc., and Marc Lawrence of Fairfield Industries for the use of industry
seismic data. We are also grateful to Peter M. Duncan, then with Exploitech
Inc., for assistance in obtaining seismic data from Digicon, and to Kim
Klitgord and William Dillon of the U.S. Geological Survey for supplying
copies of USGS seismic data. Fred Paulus of Petrofina Delaware Inc. provided
much of the well information. Brad Macurda (The Energists) and Grant MacRae
(Texas A&M) shared helpful ideas on Jurassic deposition. Financial
support for this study was provided by the Texas Higher Education Coordinating
Board Advanced Research Program, Union Oil Company of California, and the
Gulf Coast Association of Geological Societies. Special thanks goes to
Xiang Li for his help with the computer-generated graphics. Finally, we
wish to thank AAPG reviewers Clyde Moore, Ernest Mancini, and Gregor Eberli
for their constructive reviews. The University of Texas at Austin Institute
for Geophysics Contribution No. 1148.
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