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The Benedum field, in the east-central part of Upton County, Texas, is in the southwestern part of the Midland basin. It is an elongate anticlinal structure having a major fault along the east flank. Minor radial or peripheral faults are probably present; however, the throw of these faults appears to be less than the productive thickness of the Ellenburger section.
Surface elevations range from 2,618 to 2,710 feet in the Benedum field. A contour map of these elevations indicates a southeastward nosing in the central part of the field.
Gas condensate is produced from three reservoirs in the Benedum field. The Pennsylvanian produces from an average depth of 10,600 feet, the Fusselman from an average depth of 11,000 feet, and the Ellenburger from an average depth of 11,300 feet. These reservoirs range in size from 1,600 acres for the Pennsylvanian to 9,700 acres for the Ellenburger.
The presence of structure was detected by a seismograph survey, first in 1935 and later confirmed in 1946. The discovery well for the Benedum field was the Slick Urschel Alford No. 1 in the SE. ¼ of Lot 2, Sec. 50½, P. B. Scott Survey. This well was completed in the Ellenburger at total depth of 12,022 feet on December 6, 1947. The Fusselman reservoir first produced in October, 1948, from the Republic Natural Gas Company Barnet "A" No. 1 well located in the NW. ¼ of Sec. 40, Block Y, TCRR Survey. Pennsylvanian production was first established by the completion in April, 1948, of the Fred Turner Jr. (now Humble) Barnet No. 1 located in NW. ¼ of Sec. 4, Block Y, GC&SF Survey.
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