Capabilities of DC logging tools with nonaxial field excitation for investigation of anisotropic beds.

It is well known that conventional DC logging methods open to a number of problems concerned<br>with the “paradox of anisotropy” and model equivalence. These problems exist only due to<br>simultaneous axial symmetry of excitation fields and strata. To cover this lack of conventional<br>methods authors offer to use logging tools with nonaxial sources. The theory of such tools was<br>developed. Mathematical modeling of galvanic tool responses in 1D and 2D isotropic and<br>anisotropic strata was performed. It was shown that logging tool based on nonaxial symmetry of<br>excitation field is free from traditional methods faults and can be used to understand complex<br>anisotropic strata.