Renshaw Field

Atascosa County

The 253 acre Renshaw lease is located geographically in the south central portion of Atascosa County, approximately 9 miles south of Christine, Texas. Geologically, it is situated within the Carrizo Wilcox Trend, in which the Carrizo “A” and “B” Sands are very prolific oil producing members.

Regional production histories of adjacent Carrizo Atkinson Sand fields substantiate that a long life can be projected for these reservoirs due to the low gas/oil ratios, which reflect solution gas only, and the important presence of a natural effective water drive. Primary recoveries from the Atkinson Sand at this depth should be 50-100 barrels of oil per acre foot. Production is accompanied by various water percentages practically from the start of its producing life. This water, being fresh in character, is beneficial rather than a hindrance due to the fact that later on, when the properties begin the decline, larger amounts of fluid may be lifted, thus increasing and maintaining a constant level or rate of oil production. This method of lifting large volumes of fluid provides a secondary recovery method, and should result in a very profitable, long term operation.

The Renshaw Carrizo Field formed as the result of structural closure against the high side of a regional up-to-the-coast fault. This fault can be traced, using well logs and seismic, at least two miles in distance. This fault, at Carrizo datum, has approximately 60’ of displacement within the eastern part of the field, and is losing displacement, and possibly dying out toward the western boundaries.

The Renshaw Carrizo Field was discovered in 1959. To date, six wells have produced over 400,000 barrels of oil (BO) within this field, all from the Carrizo “A” Sand. Based on log data, it is estimated a producible reserve total of 175,000 BO remain for potential production.

This project’s primary target, the Carrizo “B” Sand has not, as yet, produced from the Renshaw Field, and only two wells in the field have penetrated this zone. Regionally, the “B” Sand is a blanket sand and is usually found oil productive below a productive Carrizo “A” Sand. Based on log and production data, it is estimated that production in this field from the Carrizo “B” Sand could produce 340,000 BO. Four 3800’ wells are proposed to produce total estimated reserves of 510,000 BO from the Carrizo “A” and “B” Sands.

A third potential pay, the Reklaw formation, is often found below the Carrizo and will also be tested. Reserve potential was not calculated.