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<p>Quantitatively analyzing the dependence of three-directional permeability on the true-triaxial stress state is of great significance for oil and gas resource exploitation. The three-directional permeability of purple sandstone under true-triaxial stress is measured using a self-developed geophysical imaging cell with a multi-stage monotonic loading path. The experimental results indicate that the three-directional permeability exhibits anisotropy even under isotropic stress loading due to the rock’s internal heterogeneity (intrinsic anisotropy). The three-directional permeability exhibits variable stress sensitivity arising from both&#xa0;true-triaxial stress-induced and intrinsic anisotropies. The anisotropy ratios are introduced to characterize the anisotropy of three-directional permeability, which exhibit three distinct trends with increasing principal stresses: fluctuating increase, fluctuating decrease, and near constancy. Based on the above-discussed permeability characteristics, a new three-directional permeability model is proposed by integrating the exponential permeability model with the anisotropic effective stress-sensitivity coefficient. The proposed model well describes the dependence of anisotropy ratios on the effective principal stresses.</p>

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Stress Sensitivity of Three-Directional Permeability for a Purple Sandstone Under True-Triaxial Loading

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Jiacun Liu,
  • Ying Xu,
  • Yi Xia,
  • Xing Li,
  • Kaiwen Xia

摘要

Quantitatively analyzing the dependence of three-directional permeability on the true-triaxial stress state is of great significance for oil and gas resource exploitation. The three-directional permeability of purple sandstone under true-triaxial stress is measured using a self-developed geophysical imaging cell with a multi-stage monotonic loading path. The experimental results indicate that the three-directional permeability exhibits anisotropy even under isotropic stress loading due to the rock’s internal heterogeneity (intrinsic anisotropy). The three-directional permeability exhibits variable stress sensitivity arising from both true-triaxial stress-induced and intrinsic anisotropies. The anisotropy ratios are introduced to characterize the anisotropy of three-directional permeability, which exhibit three distinct trends with increasing principal stresses: fluctuating increase, fluctuating decrease, and near constancy. Based on the above-discussed permeability characteristics, a new three-directional permeability model is proposed by integrating the exponential permeability model with the anisotropic effective stress-sensitivity coefficient. The proposed model well describes the dependence of anisotropy ratios on the effective principal stresses.