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Empirical study on electromagnetic response characteristics calculation of IP anomalies in 3D geological bodies

Through three-dimensional numerical simulation, the law of induced polarization(IP) anomalies of geological bodies changing with frequency under electromagnetic action is studied and analyzed. On this basis, by studying the law of the spatial variation of the near-field field, we found that the field strength at the junction of the axial zone and the equatorial zone(transition zone) is weak, and it is easily affected by the uneven body of the non-receiving point, which makes the apparent resistance The rate is distorted, and the position of the transition zone is affected by the direction of the emission source. Finally, through field experiments, the apparent resistivity distortion area and the effective observation area are divided, and theoretical suggestions are provided for the field exploration data collection of the Spectrum induced polarization method.