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Influence of Different Formation Parameters on Electromagnetic Response of Micro-Cylindrically Focused Logging

Micro-cylindrically focused logging (MCFL) is a focusing type of resistivity logging method which can measure the resistivity of shallow formations at different depths. In this paper, the measurement principle of MCFL is introduced and three-dimensional electromagnetic modeling is realized by FEM. Simulation results show that the instrument has excellent detection performance and high axial resolution. In addition, the electromagnetic response of MCFL in inhomogeneous media is simulated and variations of the logging response with different formation parameters are investigated and analyzed. The influences of flushed zone, mud cake, and slurry are summarized and explanations of peculiar phenomena are given in detail, which is helpful to guide the production and optimize the instrument.