A slope method of determining absolute resistivity for Schlumberger electrode configuration

A formula has been devised and tested for determining the absolute resistivities of subsurface layers. Three case studies have been made for testing the validity of the formula. The absolute resistivities, have been determined from the slope of the segments of the curve and calculated by intercept method. The depths of the subsurface layers obtained from the intersections of the segments of the curve, agree fairly well with depth of interfaces shown in the bore hole data sections.