The objective of this study is to demonstrate the effect of changes in dielectric permittivity on induction logging data during invasion evolution. As an investigation method we use invasion simulation and electromagnetic (EM) modeling of induction tool responses. In this study we simulate signals of EM tools to analyze the influence of different types of dielectric permittivity distribution and to estimate the influence of dielectric permittivity on induction logging signals. Analysis of the computed induction tool signals shows that dielectric permittivity influence on magnetic field attenuation is higher than on magnetic field phase difference. Induction measurements (transmitter frequency > 1 MHz) are significantly influenced by dielectric permittivity distribution in the invaded zone. The highest influence of dielectric permittivity on induction logging signals is observed in the case of low formation water saturation and high resistivity of drilling mud.
