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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Structure and Evolution of North Choctaw Ridge Field, Alabama, a Salt-Related Footwall Uplift Along the Peripheral
Fault
System, Gulf Coast Basin
Jiafu Qi (1), Jack C. Pashin (2), Richard H. Groshong, Jr. (3)
ABSTRACT
North Choctaw Ridge (NCR) Field is in a structural trap
that produces from the Jurassic Smackover Formation in the Gilbertown graben system, near the updip limit of the Louann Salt. The field is in a footwall uplift below the southernmost of the three faults that form the northern boundary of the graben system. The top seal is anhydrite in the overlying Buckner Member of the Haynesville Formation, and the boundary
fault
provides a lateral seal. The geometry and evolution of the structure has been determined from a three-dimensional interpretation of the graben system and from a balanced and sequentially restorable cross section. The cross section is both area and length balanced with a lower detachment in the Louann Salt. Significant structural growth began in Early Cretaceous time when three major south-dipping, down-to-the-Gulf faults formed, creating an imbricate system of half grabens (the Melvin
fault
system). Regional subsidence in the hangingwall of the Melvin
fault
system indicates contemporaneous salt deflation, with the NCR Field subsiding the least. The north-dipping boundary
fault
of the Gilbertown graben system (East Gilbertown
fault
) developed in the Late Cretaceous. Late Cretaceous and Tertiary extension produced a full graben between the East Gilbertown and Melvin C faults.
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