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analysis Andrews County apparent resistivity approximately average base mud bed thickness bore hole borehole boundary calculated cent chart clay coil system computed conductivity connate water core correction corresponding counting rate deflection determined device dolomite drill hole effect electrical log electrochemical equal equation example field fluid flushed zone formation factor formation resistivity formation water GAMMA RAY geometrical factor given guard electrode 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 plotted porosity porous potential quantitative ratio recorded resistivities recorded resistivity log S.P. log salinity Schlumberger shale shaly sand shown shows sodium chloride solutions sonde SP curve SP log static S.P. tion Trans true resistivity water saturation