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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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A method is presented of correlating electrical logs of specific sub-strata penetrated by the drill over very short or very long distances by the use of exact resistivity values of the shales.
Cross sections showing the subsurface correlation derived from electrical logs recorded on wells spaced over large distances in Mississippi and Louisiana illustrate the resistivity changes in shales which occur with changes in locations or geological age.
These clay or shale resistivity gradients may be extrapolated for distances of about 50 miles so that correlations may be anticipated at the new locations. This method of using the exact values of the shale resistivities provides an important tool for subsurface correlation by means of the electrical log. The silhouette of the curves of the electrical logs opposite sand sections has been used for many years for correlation.
The method discussed gives invaluable added factors which will help in eliminating uncertainties in subsurface correlation. It will also help in a general study of sedimentary cycles and local structures.
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