The original lease block on the area which is now the Imogene Oil Field was taken as a result of the discovery in 1935 by surface geology of a large fault, upthrown to the southeast. A general reconnaissance reflection seismograph survey followed in 1940, preceding the drilling of the discovery well by about two years. A further detailed reflection seismograph survey was made after the discovery to outline the structure more accurately.

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First page of History of the Imogene oil field, Atascosa County, Texas
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