About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 36 (1986), Pages 401-407

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.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24