基于有限元-积分方程的三维可控源电磁法混合正演模拟

作者：周峰,汤井田,任政勇,张志勇,陈煌,皇祥宇,钟乙源

摘要：We have developed a hybrid solver that combines the finite-element and integralequation method for 3D CSEM modeling based on unstructured meshes.To avoid the source singularity,the secondary field is used in the modeling framework.The primary electromagnetic field from an electric dipole source in a layered medium is calculated based on the magnetic vector potential method.The inhomogeneities of the computational region are discretized by a vector-based finite-element mesh with boundaries at finite distance from the inhomogeneities by using the dyadic Green’s function,reducing the truncation boundary effect and the solution region.The electric and magnetic Green’s function is used in data postprocessing to reduce the numerical errors owing to inaccurate gradients because of unstructured meshes;thus,the electromagnetic field is more accurately calculated.Finally,the proposed algorithm is applied to a block and a disc model,and we assess the topography effect on the field components.

发文机构：School of Geosciences and Infophysics of Central South University School of Geophysics and Measurement-control Technology

关键词：CSEMFEMIEhybridalgorithmMESH

分类号： O175.5[理学—数学][理学—基础数学]