The Edna gas field, Jackson County, Texas, was discovered in 1919 by means of surface geology. Eighteen tests were drilled between 1921 and 1932, eight of which were completed as gas wells at depths between 2,600 and 4,100 feet, in formations ranging in age from Oakville to "Frio."

Deeper development in the years from 1932 through 1938 found gas at depths ranging from 4,600 to 5,400 feet, in formations ranging from lower Catahoula ("Frio") to Textularia warreni (Vicksburg) in age.

Twenty-five tests were drilled during the entire period of 1921-1938, during which time fifteen gas wells were successfully completed. Of the latter group five wells are now producing, all from the "Frio" between 4,600 and 5,000 feet. The deepest test drilled to date, the Steinberger Petroleum Corporation's Drushel No. 1, penetrated the lower Jackson at a total depth of 7,170 feet in 1937.

A pronounced sand inlier and wooded area of about 6,000 feet diameter marks the topographic character of the field. The subsurface structure is apparently a relatively flat, closed domal feature with a closure in excess of 100 feet although the exact amount of closure is still unknown. About 4,000 acres are considered to lie within the total area of probable closure but only 600 acres may be designated as productive to date.

Gas production to the present time amounts to approximately 10 billion cubic feet. The present relatively undeveloped state of the field precludes any definite estimates concerning future reserves.