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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 47 (1997), Pages 27-34

Sequence Stratigraphy and Structural Trap Styles of the Tuscaloosa Trend

Kirk A. Barrell (1)

ABSTRACT

A re-evaluation was performed on Amoco Production Company's Tuscaloosa producing fields in the Tuscaloosa Trend. At the time, the production was declining and the reservoir pressures were rapidly falling in these prolific fields. Sequence stratigraphic analysis was applied to determine a physical chronostratigraphic framework by interpreting sequences, system tracts, and parasequences on well logs, seismic, and biostratigraphy. Depositional systems and lithofacies tracts within system tracts and parasequences were defined and utilized to analyze existing and prospective reservoirs. Four Tuscaloosa sequences have been identified herein: "A","B","C", and "D". The re-evaluation of the Tuscaloosa Trend included the evaluation and integration of 1,200 miles of reprocessed 2D seismic data and over 300 well logs.

Following the completion of the regional evaluation, three 3D surveys have been acquired and fifteen successful wells have been drilled. The changes in the regional structural and stratigraphic models were incorporated into the detailed evaluation of the 3D surveys. The combination of the Lower Cretaceous shelf margin and the deep Louann salt played a significant role in the control of trapping style and deposition, and resulted in three unique strike-trending regions. Within the three unique regions, four structural trapping styles have been identified and defined. The four types are: 1) unexpanded faulted anticline over salt, 2) expanded and unexpanded faulted anticline over salt, 3) expanded three-way fault closure and, 4) expanded and faulted rollover anticline.


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