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The AAPG/Datapages Combined Publications Database
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Fashing field, as presently defined, is 10 mi long and 2 mi wide. The field is in the deep Edwards fault trend and extends from the southeast corner of Atascosa County to the northwest corner of Karnes County, approximately 50 mi southeast of San Antonio, Texas. Lone Star Producing Co. discovered gas in the Edwards Limestone (Lower Cretaceous) at Fashing in July 1956 when their No. 1-A L. T. Urbanczyk well reached the top of the Edwards at 10,210 ft and found 580 ft of productive section that had an initial potential of 26 million cu ft of gas a day and 24 bbls of 50.6°-gravity distillate per million cubic feet.
The Edwards structure at Fashing field is dominated by a simple, northeast-trending up-to-the-coast fault with effective closure against the upthrown side. This fault has a maximum vertical displacement of approximately 700 ft at the Edwards level, which decreases upward to a maximum of 320 ft at the Carrizo Sand (Eocene) level. The fault traps the Weigang field oil accumulation at the Carrizo level. The fault dips northwestward, with the angle of dip decreasing from 50° at the Carrizo to 38° at the Edwards.
Edwards gas production at Fashing is from two separate zones called the A and B Zones, respectively. The A Zone has an average porosity of 15.5 per cent, an average permeability of 12.6 md, and an average connate water saturation of 28 per cent. The B Zone has an average porosity of 13.2 per cent, an average permeability of 4.4 md, and an average connate water saturation of 24 per cent.
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