Comparison of 3D controlled-source electromagnetic forward modeling based on the nodal finite element and the edge-based finite element
Tang Wenwu1, Liu Jianxin2, Ye Yixin1, Zhang Hua1
1. School of Geophysics and Measurement-Control Technology, East China University of Technology, Nanchang, Jiangxi 330013, China; 2. School of Geosciences and Info-physics, Central South University, Changsha, Hunan 410083, China
Abstract：In the early stage,the nodal element was mainly used for the forward modeling of the 3D controlled-source electromagnetic (EM) responses,but its spurious mode affected calculation efficiency and solution accuracy.The edge-based finite element method is increasingly adopted in the 3D EM modeling since it can avoid spurious solutions.To study details of the efficiency and accuracy between these two methods,comparison experiments are carried out.First the construction of the boundary-value problem is discussed.Then the forward modeling based on these two methods are achieved on both a horizontal-layered model and a single low-resistivity body model.Our comparison experiments show that under the same modeling condition,the result accuracy with the edge-based finite element is better than that with the nodal element while the edge element is slower than the nodal element as the first one spends about twice of calculation time of the latter one.
汤文武, 柳建新, 叶益信, 张华. 基于节点有限元与矢量有限元的可控源电磁三维正演对比[J]. 石油地球物理勘探, 2018, 53(3): 617-624.
Tang Wenwu, Liu Jianxin, Ye Yixin, Zhang Hua. Comparison of 3D controlled-source electromagnetic forward modeling based on the nodal finite element and the edge-based finite element. Oil Geophysical Prospecting, 2018, 53(3): 617-624.
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