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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 8027616, 12 pages
https://doi.org/10.1155/2017/8027616
Research Article

Finite Element Method for Modeling 3D Resistivity Sounding on Anisotropic Geoelectric Media

1State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2University of Chinese Academy of Sciences, Beijing 100049, China

Correspondence should be addressed to Tao Song; nc.ca.giyg.liam@oatgnos

Received 11 January 2017; Accepted 9 April 2017; Published 15 May 2017

Academic Editor: Ben T. Nohara

Copyright © 2017 Tao Song et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A 3D DC finite element method forward program is developed in this paper for anisotropic geoelectric media. Both total and secondary field approaches have been implemented. In this paper, we focused on the structured grid scheme. The modeling shows that the symmetry of the structure grid determines the symmetry of the response potential around the point source for an anisotropic half-space. Through numerical modeling with three kinds of coarse meshes by the total field approach and secondary field approach separately, a higher accuracy can be achieved via the secondary field approach. And the relative error between the numerical solution and the analytical solution is less than 2%. Modeling results contrasting with previous scholars also verify the correctness of the algorithm. Then, the numerical results of 3D models with anisotropic properties were presented and compared to models with isotropic properties. These results clearly illustrated the strong effect of anisotropy and the problems in interpretation if anisotropy was not properly addressed. This work will establish the foundation for our future effort of building a 3D inversion program with arbitrary anisotropy.