The Wilcox Group (lower Eocene) in the United States Gulf Coast reached its 50th year of productive history in 1975. It has furnished important reserves in several hundred oil and gas fields along a 600-mi stretch from Mississippi to Mexico. No single oil field has supplied as much as 100 million bbl, and only two of its many gas fields held more than a trillion cu ft. Successful operations generally contended with erratic reservoirs. Exploration was difficult, as geologic and geophysical evidence usually was subtle, and interpretation required a generous application of intuition. It never conformed to the politicians’ favorite...
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