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Techniques that permit a quick, practical, and satisfactory evaluation of electrical logs were developed to estimate the volume and distribution of saline water in aquifers in Louisiana. Of about 200,000 available electrical and induction-electrical logs, approximately 1000 representative logs (about I per township) were selected for detailed analysis. An empirical relation, called the field formation resistivity factor Ft, was determined as the ratio of formation resistivity R0 to water resistivity Rw corrected to a temperature of 25øC, Ft = Ro/R•. The field formation resistivity factor was used to estimate the altitude of

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