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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
The Bryan Field--A Sedimentary Anticline (1)
Marvin L. Oxley (2), Daniel E. Herlihy (3)
ABSTRACT
Although the Bryan field has existed as a producing structure since 1958, this paper presents the first published data detailing the geologic history and origin of the structure. Drilling of the discovery well for the Jurassic (Cotton Valley) sediments was preceded by a detailed seismic program which outlined an anticlinal feature corresponding to the shallow (Cretaceous) production.
On the assumption that the structure was a salt-cored anticline, the discovery well was permitted for 17,000 feet but was drilled to 21,105 feet before reaching salt. A reevaluation of the data reveals the Bryan field as a classic example of the sediment-cored anticline or "turtleback" structure. An unusual thickness of Haynesville sediments and a continued outward flow of salt into nearby salt-cored anticlines combined to produce the sedimentary structure which is the subject of this study.
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