Three-dimensional forward modeling for the SBTEM method using an unstructured fi nite-element method
Wang Lu-Yuan 1, Yin Chang-Chun♦1, Liu Yun-He 1, Su Yang 1, Ren Xiu-Yan 1, Hui Zhe-Jian 1, Zhang Bo 1, and Xiong Bin 2
1. College of Geo-Exploration Sciences and Technology, Jilin University, Changchun 130026, China.
2. College of Earth Sciences, Guilin University of Technology, Guilin 541006, China.
Abstract：
In this study, we propose a three-dimensional (3D) forward modeling algorithm of surface-to-borehole transient electromagnetic (SBTEM) fields based on an unstructured vector finite-element method to analyze the characteristics of SBTEM responses for complex geoelectrical models. To solve the double-curl diff usion equation for the electric fi eld, we use an unstructured tetrahedral mesh to discretize the model domain and select the unconditionally stable backward Euler scheme to discretize the time derivative. In our numerical experiments, we use a grounded wire as a transmitting source. After validating the algorithm’s effectiveness, we first analyze the diffusion characteristics and detectability of the electromagnetic field. After that, we focus our attention on the distribution and the cause of zero bands for Ex and dBy/dt components with the hope of guiding future field surveys. Finally, by simulating diff erentmodels, we analyze the capability of the SBTEM method in detecting typical mineral veins so that we can provide a reference for mineral resource exploration in the deep earth.
2021, Vol. 18 
