We have used also the parameter estimation method for 3-D inversion of the IP data. The method was tested on the models with galvanic excitation of the electromagnetic field in the earth. The results of this project have demonstrated the possibility of electromagnetic coupling removal from the frequency domain IP data in a 3-D environment using the integral equation forward modeling method. We generated the synthetic EM data with and without the IP effect for a typical geoelectrical model of a rectangular conductive body in a homogeneous background. The model with the electric bipole transmitter.
Top panel shows the survey configuration.
Bottom panel shows the receiver locations and the parameters of the anomalous ore body. Figure 2 shows vertical distribution of the secondary magnetic field in the model at 32 Hz. The solid white line shows the boundary of a conductive body, and the white arrows show the direction and magnitude of the magnetic field. The top panel in this figure presents the distribution of the total EM coupling effect. The middle panel shows the EM induction anomaly.