Two-dimensional modeling of complex resistivity using finite element method
复电阻率法二维有限元数值模拟

With wide application of complex resistivity method,searching precise,rapid forward and inversion algorithms has become the focus of complex resistivity research.We have developed a finite element algorithm for computing the complex resistivity response of general two-dimensional models in the paper.Triangular element grid is used in the finite element method(FEM).The simplifying boundary condition on infinite boundary is employed to improve the speed of calculation.The modeling takes two steps.Firstly,we compute apparent complex resistivity values for four different frequencies by FEM.Then,apparent Cole-Cole parameters are derived from these apparent complex resistivity values using a recursive method.The algorithm has been tested by comparing with one-dimensional algorithm.Two typical two-dimensional polarization models are used by the forward approach.The apparent complex resistivity and the apparent Cole-Cole parameters maps show that there are distinct anomaly features in the section maps of apparent complex resitivity and apparent Cole-Cole parameters.