We developed software for the numerical simulation and inversion of galvanic and induction log data. The simulation algorithm is based on a finite-element approach to calculating electrical and electromagnetic responses in a 2D model that includes horizontal layers, cylindrical near-borehole zones changed by drilling, borehole with drilling mud and tool body. Unfocused lateral logging tool wth gradient arrays) signals are applied to estimate resistivity values in the horizontal and vertical directions, whereas high-frequency electromagnetic sounding tool logs are employed to evaluate the frequency dispersion of electrical conductivity and dielectric constant of formations. Using the developed programs, high-accuracy field data acquired wth the SKL logging equipment on the Bazhenov formation inteivals in the central regions of Western Siberia were interpreted. We determined the electrophysical parameters of the high-re-sistivity impermeable Bazhenov rocks. The correlation of the parameters with the data of other logging methods was investigated, wth establishing their relationship with the structural-material composition. We compared the frequency-dependent values of electrical conductivity and dielectric constant with the petrophysical core measurements data. The results of the numerical inversion of the electromagnetic log data measured on the Bazhenov formation interval are consistent with the laboratory measurements. We carried out SIKL data interpretation with the determination of the material composition, identification of the lithological types and study of the electrophysical parameters of the Formation rocks for the central regions of Western Siberia. By applying the mixture formulas for electrical conductivity and dielectric constant, more than three dozen of litho-electrophysical models and several correlation schemes for the Russkinskoye, Fedorovskoye, Vostochno-Surgutskoye and Tailakovskoye fields were constructed according to SIKL logging signals.
