Exploring the detection performance of different array configurations for Multi-electrode resistivity method tomography using a 2.5D finite element method

Authors

ZHAO Rongchun, College of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaFollow
LYU Yuzeng, College of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaFollow
ZHANG Zhi, College of Earth Sciences, Guilin University of Technology, Guilin 541004, China
WEI Liuye, College of Earth Sciences, Guilin University of Technology, Guilin 541004, China
PAN Hongxu, College of Earth Sciences, Guilin University of Technology, Guilin 541004, China

Abstract

Multi-electrode resistivity method is equipped with various electrode array configurations. Due to their different electrode arrangements, various electrode array configurations tend to exhibit significantly varying detection effects under different survey environments. Hence, to achieve satisfactory detection effects using high-resolution electrical resistivity tomography, it is necessary to explore the strategy for choosing appropriate array configurations targeting different objects in practical work. Given the high applicability of the method, its forward and inversion calculations remain a critical task. Based on the differential equations to be satisfied by the point source potential in a three-dimensional structure, this study derived the variational problem to be satisfied by the 2.5D potential and conducted the unstructured gridding using the Delaunay triangulation algorithm, thus achieving finite-element forward modeling. By combining practical applications, this study designed common geological models and performed forward and inverse calculations using Wenner $\alpha $, Wenner $\beta $, Schlumberger, and dipole-dipole arrays, analyzing their detection effectiveness in different environments. Key findings are as follows: (1) For the detection of isolated anomalous bodies in an unknown area, the Wenner $\beta $ and Schlumberger configurations, determined by considering the accuracy and efficiency, can yield better detection effects. (2) The Schlumberger and dipole-dipole configurations exhibit higher horizontal resolution and can distinguish multiple anomalous bodies nearby. (3) For the detection of low-resistivity fractured zones, the Wenner $\beta $ and dipole-dipole configurations enjoy better performance. (4) For strata with distinct boundaries, the Wenner $\alpha $, Wenner $\beta $, Schlumberger, and dipole-dipole configurations can all yield encouraging detection results. Therefore, for data collection using high-resolution electrical resistivity tomography, it is necessary to choose multiple array configurations and conduct comprehensive comparisons and interpretations of the forward and inverse modeling results.

Keywords

Multi-electrode resistivity method, unstructured grid, finite element method, array configuration, geophysical forward and inversion calculations, resistivity

DOI

10.12363/issn.1001-1986.23.11.0731

Recommended Citation

ZHAO Rongchun, LYU Yuzeng, ZHANG Zhi, et al. (2024) "Exploring the detection performance of different array configurations for Multi-electrode resistivity method tomography using a 2.5D finite element method," Coal Geology & Exploration: Vol. 52: Iss. 4, Article 14.
DOI: 10.12363/issn.1001-1986.23.11.0731
Available at: https://cge.researchcommons.org/journal/vol52/iss4/14

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