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Book Chapter

Ship Shoal Anticlinal Structure

By
G. Huxford
G. Huxford
Tenneco Oil Company
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Published:
January 01, 1983

Abstract

The exhibited line "A" is displayed to show an anticlinal structure that has associated faults and hydrocarbon indicators. The data is presented as it has come from the contractor and the processing is routing. Line "A" is located in the Pliocene trend approximately 64 km (40 mi) off the coast of Louisiana and was shot in 1978. The geologic section is composed of sand-shale sequences with occasional thin limestones. The sand deposits in the area appear to be regular and predictable and exhibit uniform deposition across the structure.

Structurally this line exhibits an anticline starting at approximately 1.5 secs. The anticline is apparently related to deep-seated diapiric movement that occurred during several periods of time. Gravity supports a deep diapir, but deep seismic data does not resolve the salt outline. Complications associated with the complex faulting in the area also give credence to this concept. The structure can be seen to be developing between the event indicated at 1.4 secs and the deeper levels. Thinning across the structure can be seen between the shallow horizon at 1.5 secs and the deeper events that have been indicated. The deeper horizons that have been marked are not necessarily correlative. Dominant faulting in the area is normal faulting with the dominant faults being down-to-the-south and the antithetical down-to-the-north faulting setting up additional traps and a large graben system. Fault "A" is the dominant fault with fault "B" dying out into "A." Depositional thickening can be seen across the fault by comparing the throw of fault "A" at shotpoint 1385 (0.6 secs) and at shotpoint 1361 (1.3 secs). Correlations across the faults in this area are fairly reliable at shallower depths. Growth can also be seen on fault "B" and also on the smaller fault that is antithetic to "B."

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Contents

AAPG Studies in Geology

Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces

A. W. Bally
A. W. Bally
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American Association of Petroleum Geologists
Volume
15
ISBN electronic:
9781629810188
Publication date:
January 01, 1983

GeoRef

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