This study proposed the variational problem of 2.5D finite element forward modeling of the complex resistivity method and detailed the process of solving stiff matrix of finite equations. The Fractal model was introduced as a research model for studying the equivalent induced polarization anomalies of spectra. Furthermore, the complex conductivity and complex potential of a grid unit were linearly interpolated. Then, to obtain anomalous complex potential, finite element linear equations were solved using the biconjugate gradient stabilized method with incomplete LU decomposition. The results of three typical geoelectric models validated the correctness and accuracy of the algorithm proposed in this study. Furthermore, this study analyzed the abnormal response characteristics of 2.5D complex resistivity under different frequencies.
龙秀洁, 陈汉波, 莫亚军, 区小毅, 卢胜辉. 基于Fractal模型的复电阻率法2.5D有限元数值模拟[J]. 物探与化探, 2022, 46(4): 887-896.
Long Xiu-Jie, Chen Han-Bo, Mo Ya-Jun, Ou Xiao-Yi, Lu Sheng-Hui. Fractal model-based 2.5 D finite element modeling of complex resistivity method. Geophysical and Geochemical Exploration, 2022, 46(4): 887-896.
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