原位开采状态下油页岩渗透特性演化规律研究

doi:10.13722/j.cnki.jrme.2020.0521

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Abstract In order to study the evolution of the permeability characteristics of oil shale under in-situ exploitation，permeability tests on the oil shale from Fushun west open pit mine were performed by high temperature triaxial permeability testing machine，and the pore microstructure of the oil shale was characterized by the mercury injection apparatus. The evolution mechanism of the permeability was discussed. The results show that the porosity and the permeability of the oil shale have a good correlation with each other. With increasing the temperature，the oil shale specimens evolve from the dense state to the porous medium，and both the porosity and the permeability increase. The pore pressure fluid has multiple physical effects on the variation of the pore structure，especially at the stage of oil and gas production due to pyrolysis of the organic matter. The pore characteristic parameters of the oil shale after high temperature permeability tests are significantly improved compared with those heated in muffle furnace. The porosities of the oil shale samples at the temperature of 300 ℃，400 ℃，500 ℃ and 600 ℃ increase by 0.6%，8.62%，1.82% and 7.83%，respectively. At 600 ℃，the macropore and mesopore volumes increase by about 1.3 and 2.4 times，respectively. Before 300 ℃，the permeability of the oil shale samples is mainly affected by the thermal stress caused by uneven thermal expansion of mineral particles and water precipitation. At 300 ℃﹣400 ℃，the complex reaction inside the oil shale occurs and many impermeable pores form，resulting in an uncoordinated change between the porosity and the permeability. 400 ℃﹣600 ℃ is the main pyrolysis stage of the oil shale. In this stage，the pyrolysis pores in the oil shale are continuously generated and connected，forming the flow channel of oil and gas products and increasing the porosity by 25.77%，and the permeability increases by about 9.06 times when the pore pressure is 1.0 MPa.

Key words： rock mechanics oil shale in-situ exploitation permeability pore structure mercury intrusion method

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	Articles by authors
	ZHAO Jing1
	2
	LIU Zengqi1
	KANG Zhiqin2
	3
	YANG Dong2
	3

Cite this article:

ZHAO Jing1,2,LIU Zengqi1, et al. Study on evolution of permeability characteristics of oil shale under in-situ exploitation[J]. , 2021, 40(5): 892-901.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0521 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/892

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