The problem of deciding on the best geologic parameter and mapping procedure for prospect location can be simplified by the use of similarity maps and comparison functions. Structural or other geologic data are contoured by digital computer, filtered to extract and enhance specific features, then tested against areas of known production. Tests include the application of similarity maps that can be used to locate the specific areas that are most similar to those that are known to have production. Statistical comparison functions help to minimize personal bias in choosing the best mapping procedure.

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