Visualization design of 1D CSAMT forward modeling and research on the induced polarization effect

This study developed a piece of visualization software of the 1D data forward modeling applicable to the controlled source audio-frequency magnetotellurics (CSAMT). This software has the advantages of friendly interfaces and simple operations. In detail, MATLAB was used to develop the core algorithms, and linear filter coefficients were introduced to solve Hankel integral in the process of forward modeling. Meanwhile, the accuracy of schemes using different linear filter coefficients was compared. The operation interfaces were designed using Java, and multi-parameter setting interfaces with a high automation degree are available. Moreover, the data processing results can be intuitively provided to users using the drawing function of the software. In the calculation process, Cole-Cole model parameters were introduced, and complex resistivity was used to replace the DC resistivity without considering the polarization effect of geoelectric bodies. Furthermore, this study carried out the forward simulation of CSAMT field source on a one-dimensional layered model of induced polarization (IP) media and discussed the IP effect of one-dimensional layered media with polarization layers at different burial depths. It was found that the frequency band of CSAMT affected by the IP effect widened with a decrease in the burial depth of polarization layers. This result is crucial to understanding the electromagnetic response characteristics of the CSAMT method with IP effect and improving the convenience and efficiency of data processing.