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Damon Mound is a conspicuous rounded elevation in northwestern Brazoria County, Texas, 38 miles southwest of Houston. It is oval in shape, covers an area of 1,670 acres and rises 83 feet above the surrounding prairie. This elevation is the result of an intrusive salt plug which has raised the surface above its normal position.
The salt plug is composed of almost pure rock salt and is capped by deposits of gypsum, anhydrite, and limestone. Formations surrounding the salt plug are inclined at angles of about 45° away from the salt plug. Mineralized water and gas seepage in shallow water wells, sour dirt, sulphur, and lime rock on the surface are indications of the salt dome.
Two hundred ninety-one wells were drilled prior to the year 1924, 85 producing oil, 154 being dry, and the remainder being classed as sulphur tests. Total production for this period amounts to 5,008,870 bbls., all of which was obtained from an area of 280 acres. There are two producing areas, one on the northeastern side, the other on the southwestern side of the dome. The major portion of oil was obtained from the southwestern side. Production per acre averages 19,265 bbls. Average production of producing wells is 58,927 bbls., and the average depth 2,416 feet. The oil is of asphaltic base with gravities averaging about 22.5° B. Production is obtained around the sides of the dome in sands and limes of Oligocene age.
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