实时高温作用下油页岩力学及破裂特性演变规律研究

doi:10.13722/j.cnki.jrme.2024.0143

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Abstract In order to obtain the effects of temperature and bedding plane on the microstructure，macroscopic mechanical parameters and fracture characteristics during the in-situ pyrolysis of oil shale，the self-developed real-time high-temperature thermo-mechanical coupling CT scanning device and high-temperature rock mechanics test system were used to carry out thermo-mechanical coupling CT scanning and uniaxial compression tests on oil shale in two directions of perpendicular to bedding and parallel to bedding from 20 ℃ to 600 ℃. The results reveal that：(1) Up to 400 ℃，the stress state of oil shale is the key factor to determine the law of pore fracture propagation. Under perpendicular loading to the bedding，the pore diameter and fracture aperture initially decreasing and then increasing with temperature increasing. Under parallel loading to the bedding，primary fractures propagate along the bedding planes，accompanied by the emergence of new fractures. (2) When loading in both perpendicular to and parallel bedding directions，the compressive strength，elastic modulus，and Poisson's ratio of oil shale initially decreasing and then increasing. Specifically，the compressive strength and elastic modulus reach their minimum values at 400 ℃，whereas the Poisson?s ratio attains its minimum at 500 ℃ and 200 ℃ when loading perpendicular to bedding and parallel to bedding，respectively. (3) Except for the the fracture damage stress during perpendicular bedding loading initially increases，then decreases，and subsequently increases with temperature，the initial stress during perpendicular bedding loading ，parallel bedding loading ，and damage stress decrease initially and then increase，reaching their minimum values at 400 ℃. These research findings provide essential data for reservoir reconstruction and cementing technology in the in-situ mining process of oil shale.

Key words： rock mechanics thermo-mechanical coupling oil shale anisotropy thermal cracking uniaxial compression fracture propagation

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	Articles by authors
	YANG Shaoqiang1
	2
	ZHANG Qinglun1
	YANG Dong3
	WANG Lei3

Cite this article:

YANG Shaoqiang1,2,ZHANG Qinglun1, et al. Research on the evolution law of mechanics and fracture characteristics of oil shale under real-time high temperature conditions[J]. , 2024, 43(11): 2700-2711.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0143 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2700

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