a) collecting or obtaining electrical signal data that results from interaction of electrical signals with the formation rock;

b) using a physical model that quantifies electrical conductivity response of the formation rock to calculate effects of the at least one electrically conductive mineral component on the electrical signal data, the physical model representing electrically conductive mineral inclusions uniformly distributed in a fluid-filled, porous matrix made of nonconductive grains possessing surface conductance;

c) processing the electrical signal data of a) to remove the effects of the at least one electrically conductive mineral component as calculated in b);

d) performing an inversion process using the resultant electrical signal data of c) to determine data characterizing resistivity or conductivity of the formation rock; and

e) using the data characterizing resistivity or conductivity of the formation rock of d) to determine at least one parameter of the formation rock, the at least one parameter comprising at least one of water saturation or cation exchange capacity (CEC),

wherein the data characterizing resistivity or conductivity of the formation rock is used to determine the at least one of water saturation or CEC of the formation rock in e) to estimate a true hydrocarbon reserve in the formation rock, and wherein the use of the data characterizing resistivity or conductivity of the formation rock to determine the at least one of water saturation or CEC of the formation in e) provides benefits for performing operations of b) to e) to improve estimation of a hydrocarbon reserve.