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<p>Anisotropy is widely present in geological environments with well developed fractures or stratification and should not be neglected in geoelectrical interpretation. In this study, a three-dimensional finite element simulation of arbitrary anisotropic resistivity is implemented based on unstructured meshes. The accuracy and effectiveness of the proposed algorithm are verified through comparisons with analytical or reference solutions from two typical geoelectrical models. Considering the limitations of conventional electrode based electrical prospecting, including insufficient information from a single survey line and a single acquisition direction, this work integrates multichannel electrodes with azimuthal resistivity measurements. In addition, the anisotropic response characteristics of the Wenner collinear array and the square non-collinear array are systematically compared. Numerical simulations of arbitrary anisotropy in a half space indicate that the square non-collinear array does not exhibit the anisotropy paradox and shows higher sensitivity to anisotropy, with the apparent resistivity anisotropy coefficient being more than five times that of the Wenner array. Compared with traditional electrodes, multichannel electrodes can acquire more comprehensive geoelectrical information, enabling accurate identification of the bedding dip direction in TTI (Tilted Transversely Isotropic) media and effective discrimination between VTI (Vertically Transversely Isotropic) media and their equivalent isotropic counterparts, and overcomes the limitations of conventional electrodes in anisotropy detection.</p>

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Research on three-dimensional forward modeling and response characteristics for anisotropic resistivity based on multichannel electrodes

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Jun-kai Yu,
  • Fu-yu Jiang,
  • Jiong Ni,
  • Pei-xuan Qiao,
  • Li-Kun Gao

摘要

Anisotropy is widely present in geological environments with well developed fractures or stratification and should not be neglected in geoelectrical interpretation. In this study, a three-dimensional finite element simulation of arbitrary anisotropic resistivity is implemented based on unstructured meshes. The accuracy and effectiveness of the proposed algorithm are verified through comparisons with analytical or reference solutions from two typical geoelectrical models. Considering the limitations of conventional electrode based electrical prospecting, including insufficient information from a single survey line and a single acquisition direction, this work integrates multichannel electrodes with azimuthal resistivity measurements. In addition, the anisotropic response characteristics of the Wenner collinear array and the square non-collinear array are systematically compared. Numerical simulations of arbitrary anisotropy in a half space indicate that the square non-collinear array does not exhibit the anisotropy paradox and shows higher sensitivity to anisotropy, with the apparent resistivity anisotropy coefficient being more than five times that of the Wenner array. Compared with traditional electrodes, multichannel electrodes can acquire more comprehensive geoelectrical information, enabling accurate identification of the bedding dip direction in TTI (Tilted Transversely Isotropic) media and effective discrimination between VTI (Vertically Transversely Isotropic) media and their equivalent isotropic counterparts, and overcomes the limitations of conventional electrodes in anisotropy detection.