Three-dimensional forward modeling for the SBTEM method using an unstructured fi nite-element method

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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.

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Key words： Surface-to-borehole TEM forward modeling edge-based FE method unstructured grids zero bands

Received: 2021-02-01;

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This work was supported by This work was supported by the National Natural Science Foundation of China (Grant Nos.42030806, 41774125, 41804098, 41904104) and the Key National Research Project of China (Grant No. 2018YFC0603300).

Corresponding Authors: Yin Chang-Chun (E-mail: yinchangchun@jlu.edu.cn)
E-mail: yinchangchun@jlu.edu.cn

About author: Wang Lu-Yuan, a graduate student, received her bachelor’s degree from the College of Geo-Exploration Science and Technology of Jilin University in 2019 and is currently pursuing a master’s degree from the College of Geo-Exploration Science and Technology of Jilin University. She is primarily engaged in geophysical electromagnetic forward and inversion theory. E-mail: Wangly2315@163.com

Cite this article:

. Three-dimensional forward modeling for the SBTEM method using an unstructured fi nite-element method[J]. APPLIED GEOPHYSICS, 2021, 18(1): 101-116.

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