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Hunton Oil and Gas Fields, Arkansas, Oklahoma, and Panhandle Texas
The Hunton Limestone was discovered to be productive in the Beebe area in 1921. Since that time it is estimated that 4,300 Hunton wells in 200 fields have produced 277 million barrels of oil. The largest Hunton field is West Edmond, where 736 wells have produced more than 106 million barrels of oil; this is 38 percent of total Hunton production in the state. The depth of Hunton development now ranges from 1,900 feet in Pontotoc County, Oklahoma, to 21,000 feet in southeast Hemphill County, Texas. Production in the Arkoma Basin is from the Sallisaw and Quarry Mountain Formations, named from surface outcrops in northeastern Oklahoma. Subsurface correlations in other producing areas of the state follow the established correlations of the Arbuckle Mountains area, and all of the formations are productive. But, it is not possible to carry into subsurface interpretations the refinements of correlation that have been achieved through paleontological, and other, evidence in the surface outcrop areas. With the migration of exploratory efforts to the depths of the Anadarko Basin, an increasing understanding of the economics of deep gas production is becoming more essential. It is found that increased gas reserves with depth, as a result of increased pressures, are partially nullified by increased temperatures and an increase of the compressibility factor (Z) with depth. Thus, although well costs increase from $125,000 at the 9,000-foot level to an estimated $2,000,000 at 25,000 feet, the amount of gas at the greater depth is only 34 percent more.
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