Patent ID: 7363159

Claim:
A method for estimating (i) at least one of first and second electrical parameters and (ii) a spatial coordinate of a boundary separating first and second regions in a heterogeneous subterranean formation, the method comprising: (a) obtaining a plurality of measured electrical signals that have penetrated the heterogeneous subterranean formation, the electrical signals representative of properties of the subterranean formation; (b) comparing said measured electrical signals to a model that estimates said measured electrical signals as a function of the first electrical parameter, the second electrical parameter, and the spatial coordinate; and (c) assigning a value to the first electrical parameter and the spatial coordinate such that the model generates estimated electrical signals that are substantially equal to the measured electrical signals, wherein said assigned value for the first electrical parameter is insensitive to the second electrical parameter; and wherein the first electrical parameter comprises one of a resistivity and a dielectric constant and the second electrical parameter comprises another of a resistivity and a dielectric constant.