The downdip Eocene Yegua trend of Texas and Louisiana has been one of the most active trends in the Gulf Coast for the last eight years since the discoveries of Torro Grande and Shanghai fields. The focus of exploration has been and continues to be in the expanded EY and DY sandstone sections. These sandstones were deposited in fluvial-dominated delta and shallow marine environments at or near the shelf margin, as a prograding wedge of a lowstand systems tract.

Only a few deep Yegua tests have been drilled basinward of the Yegua shelf margin trend. These wells have encountered Yegua sandstones in the Nodosaria mexicana and Anomalina umbonatus sections at depths of 14,500 to 16,300 feet. Sedimentological analysis of conventional cores through these sandstones indicate that they were deposited by gravity-flow mechanisms in lower slope to possibly basin plain settings. The sandstones are thin bedded and commonly graded. The thicker sandstones are massive appearing and the thin bedded sandstones commonly exhibit Bouma b-c-d and c-d turbidite sequences. They were deposited in channel-levee complexes on a slope fan of a lowstand systems tract.

The sandstones have core porosities up to 23%, but average porosity is 16%. Permeabilities are typically in the 1 to 20 md range. The sandstones are moderately well to well sorted, very fine-to fine-grained and classify as feldspathic litharenites. They are cemented by a combination of quartz overgrowths, dolomite, kaolinite and local chlorite or illite/ smectite. Secondary porosity from feldspar dissolution is common. The sandstones have undergone significantly greater cementation than the EY and DY Yegua sandstones.

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