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<p>The anisotropic permeability of oil shale containing parallel-bedding fractures and perpendicular-bedding fractures affects the heat transfer of in situ oil shale conversion process. This study uses Jimsar oil shale as a case study, employing a real-time high-temperature triaxial stress rock mechanics testing system to study the permeability of oil shale containing single parallel-bedding fracture and perpendicular-bedding fracture. The results show that the permeability of oil shale containing parallel-bedding fracture decreases from 2.5 to 0.5 mD between 20&#xa0;°C and 350&#xa0;°C, and then increases obviously from 350 and 600&#xa0;°C, returning to its normal temperature permeability value (2.86 mD). The permeability of oil shale containing perpendicular-bedding fracture decreases between 20&#xa0;°C and 400&#xa0;°C and then increases slightly between 400 and 600&#xa0;°C. The permeability threshold temperatures for oil shale with parallel-bedding and perpendicular-bedding fractures are 350&#xa0;°C and 400&#xa0;°C, respectively. Meanwhile, this study characterizes the micro-structure of fractured oil shale using micro-CT technology. The changes in permeability of parallel-bedded fractured oil shale are primarily due to temperature-induced fractures in the bedding direction, while the variations in permeability of perpendicularly bedding fractured oil shale are mainly due to the connectivity of pores. Considering the variation of fracture permeability with temperature, the predicted production of oil and gas can decrease by up to 25%.</p>

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Experimental Study on Anisotropic Pore-Fracture and Real-Time Permeability Evolution of Fractured Oil Shale Under High Temperature and Triaxial Stress: A Case Study of Jimsar Oil Shale in Xinjiang, China

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Guoying Wang,
  • Qin Yin,
  • Housheng Jia,
  • Gan Feng,
  • Shaowei Liu,
  • Shuai Heng

摘要

The anisotropic permeability of oil shale containing parallel-bedding fractures and perpendicular-bedding fractures affects the heat transfer of in situ oil shale conversion process. This study uses Jimsar oil shale as a case study, employing a real-time high-temperature triaxial stress rock mechanics testing system to study the permeability of oil shale containing single parallel-bedding fracture and perpendicular-bedding fracture. The results show that the permeability of oil shale containing parallel-bedding fracture decreases from 2.5 to 0.5 mD between 20 °C and 350 °C, and then increases obviously from 350 and 600 °C, returning to its normal temperature permeability value (2.86 mD). The permeability of oil shale containing perpendicular-bedding fracture decreases between 20 °C and 400 °C and then increases slightly between 400 and 600 °C. The permeability threshold temperatures for oil shale with parallel-bedding and perpendicular-bedding fractures are 350 °C and 400 °C, respectively. Meanwhile, this study characterizes the micro-structure of fractured oil shale using micro-CT technology. The changes in permeability of parallel-bedded fractured oil shale are primarily due to temperature-induced fractures in the bedding direction, while the variations in permeability of perpendicularly bedding fractured oil shale are mainly due to the connectivity of pores. Considering the variation of fracture permeability with temperature, the predicted production of oil and gas can decrease by up to 25%.