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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Slumped, Delta-Front Reservoir Sandstone in the Eocene Yegua Formation, East Sour Lake Field, Southeast Texas
Robert R. Berg (1)
ABSTRACT
A core of a Yegua gas reservoir that is 45 ft (14 m) thick at a depth of 9940 ft (3030 m) shows highly disturbed bedding that is sheared and has increasing dip downward. The sandstone has some preserved ripple structure and abundant carbonaceous material that suggest the sands were deposited in an unstable, delta-front location and subjected to mass movement of sediments, similar to slumping on the modern Mississippi delta. Dip logs in four wells indicate normal faults at the base of the sandstone. The faults have variable orientations and divide the reservoir into small blocks. Slump-fault displacements are on the order of 50 ft (15 m), but their occurrence in all wells at the same level makes fault detection difficult without cores or dip logs. The multiple slump blocks are probably separated by fault zones that are barriers to fluid production.
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