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Axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space

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Abstract

As geological exploration conditions become increasingly complex, meeting the requirements of precise geological exploration necessitates the development of a controlled-source audio magnetotelluric (CSAMT) inversion method that considers anisotropy to improve the effectiveness of inversion accuracy and interpretation accuracy of data. This study is based on the 3D finite-difference forward modeling of axis anisotropy using the reciprocity theorem to calculate the Jacobian matrix by applying the search method to automatically search for the Lagrange operator. The aim is to establish inversion iteration equations to achieve the axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space. Further, we obtain an underground axis anisotropic 3D geoelectric model by inverting the impedance data of tensor CSAMT. Two synthetic data examples show that using the isotropic tensor CSAMT algorithm to directly invert data in anisotropic media can generate false anomalies, leading to incorrect geological interpretations. Meanwhile, the proposed anisotropic inversion algorithm can effectively improve the accuracy of data inversion in anisotropic media. Further, the inversion examples verify the effectiveness and stability of the algorithm.

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Acknowledgment

Thank you to the reviewers for their valuable feedback on this article, Professor Siripunvaraporn, Xie Maobi, and others for their previous research work, and the editor for their enthusiastic assistance. This work is funded financially by Heilongjiang Province Basic Research Business Expenses for Universities Heilongjiang University Special Fund Project (Grant No. 2023-KYYWF-1494) and the Natural Science Foundation of Jiangxi Province (Grant No. 20212BAB213023).

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Authors and Affiliations

  1. School of Hydraulic & Electric-power, Heilongjiang University, Harbin, 150080, China

    Xiao Liu

  2. School of hydraulic engineering, Nanchang Institute of Technology, Nanchang, 330099, China

    Fang-Wen Zheng

Authors
  1. Xiao Liu
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  2. Fang-Wen Zheng
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Corresponding author

Correspondence to Xiao Liu.

Additional information

This work was supported by Heilongjiang Province Basic Research Business Expenses for Universities Heilongjiang University Special Fund Project (Grant No. 2023-KYYWF-1494) and the Natural Science Foundation of Jiangxi Province (Grant No. 20212BAB213023).

Liu Xiao, lecturer, obtained a doctoral degree in geophysics from the China University of Geosciences (Beijing). His main interests are electromagnetic forward modeling and inversion. Currently, he teaches and conducts research in geophysics at Heilongjiang University.

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Liu, X., Zheng, FW. Axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space. Appl. Geophys. (2024). https://doi.org/10.1007/s11770-024-1076-9

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  • DOI: https://doi.org/10.1007/s11770-024-1076-9

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