... that the Archie and Waxman-Smits equations are approximately the same (r2=98%). As can be expected, due to the low cation exchange capacity (CEC) of Tirrawarra Sandstone, the second part of the Waxman-Smits equation concerning shale conductivity is very small. As a consequence, the values of Sw from the Waxman...

... reservoir characterization resistivity concentration cec well logging permeability petrophysical parameter upstream oil & gas united states government invasion shaliness Introduction The determination of hydrocarbon saturation from resistivity logs in low salinity sandstone reservoirs...