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analysis Andrews County anhydrite apparent resistivity approximately average bed thickness bore hole borehole boundary calculated cations cent chart clay coil system computed conductivity connate water core correction corresponding counting rate deflection determined device drill hole effect electrical log electrochemical electrochemical potential equal equation example field fluid flushed zone formation resistivity formation water Gamma Ray geometrical factor given guard electrode hard formations hole diameter impervious beds induction logging inflection point interpretation invaded zone invasion ions laboratory Laterolog limestone logging speed membrane method MicroLaterolog MicroLog mud cake thickness mud column mud filtrate mud resistivity NaCl Nernst equation Neutron Curve Neutron log obtained paper permeable beds plane plotted porosity porous potential quantitative recorded resistivities recorded resistivity log S.P. current S.P. log salinity Schlumberger shale shaly sand shown shows sodium chloride sonde SP curve SP log tion true resistivity water saturation