Three-dimensional forward modeling and inversion of borehole-to-surface electrical imaging with different power sources
Bai Ze1, Tan Mao-Jin1,2, and Zhang Fu-Lai3
1. School of Geophysics and Information Technology of China University of Geosciences, Beijing 100083, China.
2. Key laboratory of Geo-detection (China University of Geosciences), Ministry of Education, Beijing 100083, China.
3. Beijing Horizontal Hualong Technology Ltd., Beijing 100049, China.
Abstract：
Borehole-to-surface electrical imaging (BSEI) uses a line source and a point source to generate a stable electric field in the ground. In order to study the surface potential of anomalies, three-dimensional forward modeling of point and line sources was conducted by using the finite-difference method and the incomplete Cholesky conjugate gradient (ICCG) method. Then, the damping least square method was used in the 3D inversion of the formation resistivity data. Several geological models were considered in the forward modeling and inversion. The forward modeling results suggest that the potentials generated by the two sources have different surface signatures. The inversion data suggest that the low-resistivity anomaly is outlined better than the high-resistivity anomaly. Moreover, when the point source is under the anomaly, the resistivity anomaly boundaries are better outlined than when using a line source.
. Three-dimensional forward modeling and inversion of borehole-to-surface electrical imaging with different power sources[J]. APPLIED GEOPHYSICS, 2016, 13(3): 437-448.
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2016, Vol. 13 
