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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 47 (1997), Pages 523-528

Redevelopment of the Deep Tuscaloosa Gas Trend: A Previous Hit3-DNext Hit Seismic Case History of Judge Digby Field; Pointe Coupee Parish, Louisiana

Frank C. Sheppard, III, David N. Wright, Patrick L. McGrievy


In October 1996, Amoco Production Company completed the Parlange #5 well in Judge Digby Field with an initial flow rate of 18 million cubic feet per day (MMCF/D) and 460 barrels of condensate. This well marked a new phase in Amoco's continuing successful redevelopment of Deep Tuscaloosa gas fields using modern Previous Hit3-DNext Hit seismic technology. Since implementing Previous Hit3-DNext Hit technology, Amoco has drilled 15 consecutive discoveries, in areas once thought to be near the end of their productive lives. Previous Hit3-DNext Hit seismic technology has added value to the Tuscaloosa gas fields by defining untested fault blocks in known productive intervals and illuminating previously unseen deeper gas sand packages. This technology has also helped Amoco avoid the costly and potentially catastrophic drilling of depleted reservoirs, where current pressures are in the 4000 pounds per square inch (psi) range. Additionally, Previous Hit3-DNext Hit seismic has provided a tool for better prospect risk assessment, leading to better decisions for very expensive, deep wells, where dry hole costs average about $7,000,000.

In Judge Digby Field, Previous Hit3-DTop seismic has been directly responsible for gross gas reserve additions of over 200 billion cubic feet (BCF). The Amoco Parlange #5 is currently the deepest commercial gas well in the state of Louisiana with the deepest perforations at 21,500 ft. Amoco's Deep Tuscaloosa redevelopment program continues today in Judge Digby, False River, and Profit Island Fields.

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