Electrical logging signals in vertical and inclined wells in intervals of anisotropic Jurassic deposits (numerical modeling)

Numerical inversion of borehole electrometry signals in vertical wells was performed for Middle Jurassic deposits of the central part of Western Siberia, and a priori geological information was analyzed. Typical geoelectric models of J 2 reservoirs have been constructed. According to the results of joint inversion of galvanic and induction probe signals, the deposits in the reservoir interval and the host rocks are distinguished by a strong resistivity contrast. The thickness of the formations is small compared to the electric logging probes. The clayey intervals are also characterized by electrical anisotropy. Numerical modeling of electromagnetic logging signals was performed for these models. The article demonstrates the main changes in the synthesized signals with an increase in the zenith angle of inclination of the well.