Subtle facies changes are traced vertically and laterally in the upper Monterey and Reef Ridge formations through application of the Multiwell Faciolog (mark of Schlumberger) technique. Electrofacies, representing intervals of similar log response, are identified in a key well by comparison with mud-log, conventional core, and x-ray diffraction analysis from sidewall cores and are retained in a data base. Five subsequent wells lacking detailed core or x-ray data but with similar log suites (bulk density, neutron porosity, gamma ray, and delta time) were compared to the data base and automatically assigned electrofacies. Twelve electrofacies—including diatomite, porcellanite, chert, dolomite, mudstone, and...
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