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<p>There is an urgent need to develop new methods that complement conventional rock physics testing techniques to construct a comprehensive and reliable multimode characterization system for shale electrical properties. Laser-induced electro-response (LIER), based on the interaction between laser and shale matters, has become an effective means of evaluating the electrical properties of shale. To address the shortcomings of the LIER mathematical model and the unclear mechanism of composition and structure on LIER, in this work, a LIER model combining the contributions from the anisotropy in composition and structure was established, taking the dependence of thermal conductivity and apparent conductivity on the dip angle between bedding plane and test direction. The LIER test of the simulated samples yields the main results, such as: (1) the LIER varies non-monotonically with sample preparation pressure and reaches an extremum at a critical pressure; (2) the LIER exhibits linear negative dependence on the content of quartz sand or kerogen in powder mixtures due to the significant difference in thermal conductivity between powder and quartz or kerogen; (3) the anisotropic characteristic of the LIER arises from competition between parallel and vertical bedding textures; (4) the LIER perpendicular to the pressure direction of the sample above the critical pressure is significantly higher than that parallel to the pressure direction, which is attributed to the larger proportion of planes perpendicular to the pressure direction; (5) the LIER of periodic structured pressed samples in the direction perpendicular to the bedding plane is greater than that parallel to the bedding plane. These experiments are consistent with the fitting results of the LIER model, and the relevant mechanical property tests further confirm the validity of the LIER model. Furthermore, the applicability of the LIER model was confirmed by effectively describing the anisotropic electrical characteristics of actual shale. This study serves as a foundation for the application of LIER in the future research on the genesis of shale anisotropy.</p>

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Experimental and Modeling Investigation on Effect of Structure and Composition on Laser-Induced Electro-Response of Shales

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Xuecong Liu,
  • Kun Zhao,
  • Zhengchun Hong,
  • Yuqi Jiao,
  • Xinyang Miao

摘要

There is an urgent need to develop new methods that complement conventional rock physics testing techniques to construct a comprehensive and reliable multimode characterization system for shale electrical properties. Laser-induced electro-response (LIER), based on the interaction between laser and shale matters, has become an effective means of evaluating the electrical properties of shale. To address the shortcomings of the LIER mathematical model and the unclear mechanism of composition and structure on LIER, in this work, a LIER model combining the contributions from the anisotropy in composition and structure was established, taking the dependence of thermal conductivity and apparent conductivity on the dip angle between bedding plane and test direction. The LIER test of the simulated samples yields the main results, such as: (1) the LIER varies non-monotonically with sample preparation pressure and reaches an extremum at a critical pressure; (2) the LIER exhibits linear negative dependence on the content of quartz sand or kerogen in powder mixtures due to the significant difference in thermal conductivity between powder and quartz or kerogen; (3) the anisotropic characteristic of the LIER arises from competition between parallel and vertical bedding textures; (4) the LIER perpendicular to the pressure direction of the sample above the critical pressure is significantly higher than that parallel to the pressure direction, which is attributed to the larger proportion of planes perpendicular to the pressure direction; (5) the LIER of periodic structured pressed samples in the direction perpendicular to the bedding plane is greater than that parallel to the bedding plane. These experiments are consistent with the fitting results of the LIER model, and the relevant mechanical property tests further confirm the validity of the LIER model. Furthermore, the applicability of the LIER model was confirmed by effectively describing the anisotropic electrical characteristics of actual shale. This study serves as a foundation for the application of LIER in the future research on the genesis of shale anisotropy.