Big John (Edwards) field is in northwestern Karnes County, Texas. Its productive limits are north of and adjacent to the now abandoned Hobson field that had produced more than 3½ million barrels of oil from Reklaw and Carrizo sands. Both accumulations were trapped on the upthrown side of an up-to-the-coast fault that is a part of the Fashing-Persons fault system.

Big John field was discovered in 1960, as the result of subsurface surface mapping and trend drilling, with the assistance of major company seismic leads. The gas column is approximately 200 feet thick, and the effective oil column only 25 feet thick. Vertical closure in the reservoir is at least 250 feet. The areal extent of the field is approximately 2,600 acres.

Cumulative production as of March, 1962, has been 117,400 barrels of oil and 425 million cubic feet of gas.

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