Direct two-dimensional problems of electromagnetic logging

The problem of induction logging in two-dimensional axially symmetric media with the use of high-frequency sources of current is considered. On the ba sis of the variable-triangle method, a finite-difference algorithm has been constructed and tested, which permits simulation of the electromagnetic fi eld in complex media with resistivity varying over a wide range. The algori thm takes into account displacement currents and the finite dimensions of a current source. The calculated HFILIS (high-frequency induction-logging is oparametric sounding) signals in test tank are-compared with the experiment al results.