Texaco has drilled more than 100 wells surrounding a piercement salt dome in Vermilion Bay Field, southern Louisiana (Figure 1). Cumulative production in the field exceeds 270 billion ft3 gas and 4 million b/o since the discovery well was drilled on 23 July 1939. Early drilling around the dome clearly indicated that the salt structure has a pronounced overhang 5000–8000 ft below the surface. Accuracy in determining the location of the salt flank adjacent to each proposed new well is important to development of hydrocarbon reservoirs trapped in a narrow band against the salt. The producing horizon...

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