高温三轴应力作用下油页岩的渗透特征各向异性演化规律实验研究

doi:10.13722/j.cnki.jrme.2019.0863

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Abstract The anisotropic permeability of oil shale affects the migration velocity and extent of pyrolysis oil or convective heating fluids in oil shale formations. Therefore，studying the anisotropic permeability of oil shale at high temperatures is of great significance for in situ thermal recovery of oil shale. The real-time high-temperature triaxial stress permeability testing equipment was used to study the evolution of the anisotropic permeability of oil shale at different temperatures. The results show that the permeability in the direction perpendicular to bedding is below 10－20 m2 at the temperature form 20 ℃ to 450 ℃，which is beyond the test range of the steady-state permeability testing equipment and is in the ultra-low permeability stage, and that the permeability is 2.5×10－19 to 1.17×10－17 m2 when the temperature exceeds 450 ℃ defined as the threshold temperature for vertical bedding permeability. The permeability in the direction parallel to bedding at the temperature ranging from 20 ℃ to 400 ℃ is in the lower permeability stage with a value of 2.3×10－19 to 2.9×10－18 m2，while the permeability increases sharply in the range of 10－16 and 10－15 When the temperature is higher than 400 ℃ called as the threshold temperature for parallel bedding permeability evolution. The high-temperature triaxial pulsed-decay permeability test system was used to measure the permeability of the oil shale in the direction perpendicular to bedding at the temperature of 20 ℃ to 200 ℃，and the results show that the slippage effect dominates the permeability at this temperature range. The microstructure of the sample was characterized in detail using X-ray computed tomography，and it is found that thermal cracks mainly occur in the direction parallel to rather than perpendicular to bedding. Combined with permeability and failure laws of oil shale，the reasons for the anisotropy of the permeability in different bedding directions of oil shale at different temperatures were discussed. Finally，the theoretical guiding significance of the research results in oil shale in situ mining was discussed.

Key words： rock mechanics real-time high temperature triaxial stress permeability anisotropy CT oil shale

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	WANG Guoying
	YANG Dong
	KANG Zhiqin

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WANG Guoying,YANG Dong,KANG Zhiqin. Experimental study on anisotropic permeability of oil shale under high temperature and triaxial stress#br#[J]. , 2020, 39(6): 1129-1141.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0863 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I6/1129

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