A statistical study of resistivity logs is being made to provide control for surface-based electrical geophysical surveys. The analysis consists of tabulating probability density curves for values of resistivity chosen randomly from a log, followed by computation of various moments describing the resistivity density curves. These moments, or averages, were computed for thick sections, usually several thousand feet thick, rather than for individual formations. Characteristic patterns were found for the probability density functions, and these patterns were found to persist from well to well. Over larger distances, the patterns show slow trends. It is tempting to correlate these patterns and their trends with the stratigraphy and geologic history of the sedimentary column.

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