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| Damage evolution mechanism and mechanical behavior of tight sandstone in the second member of Xujiahe Formation in Southern Sichuan after high temperature |
| SU Tengyue1, 2, LI Gao1, 2, SHANGGUAN Ziran1, 2, ZHANG Yi3, YANG Xu1, 2, LI Hongtao1, 2, WANG Xinyang1 |
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. Underbalanced/Gas Drilling Laboratory, National Engineering Research Center of Oil and Gas Drilling and Completion Technology, Chengdu, Sichuan 610500, China; 3. Engineering Technology Research Institute of PetroChina
Southwest Oil and Gas Field Company, Chengdu, Sichuan 610017, China)
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Abstract To investigate the influence mechanism of high temperature on thermal damage and fracture of surrounding rock, tight sandstone samples from the second member of the Xujiahe Formation in southern Sichuan were selected. Uniaxial compression, Brazilian splitting, and thermogravimetric analysis experiments were conducted on the rock samples after heat treatment at temperatures ranging from 100 ℃ to 1 000 ℃. By integrating a micromechanical model based on thin section analysis and nanoindentation, we obtained insights into the deformation behavior, strength characteristics, failure modes, and micro-damage mechanisms of the heat-treated tight sandstone. The results indicate that: (1) the thermal weight loss of the rock samples exhibits three distinct stages: water loss (100 ℃–800 ℃), mineral structure transformation (around 400 ℃), and destruction (800 ℃– 1 000 ℃). Thermally induced microcracks within the grains begin to develop at 500 ℃ and become pronounced between 500 and 800 ℃, displaying characteristics of intergranular tension, accompanied by minor intragranular tension and intergranular shear. At temperatures between 800 ℃and 1 000 ℃, the number of intragranular microcracks increases rapidly, revealing a dominance of intragranular tension, secondary intergranular tension, and sporadic intergranular shear. (2) In uniaxial compression and Brazilian splitting tests on heat-treated rock samples, the deformation mechanism transitions from brittle to plastic as temperature rises; uniaxial compressive strength, tensile strength, and elastic modulus initially increase before decreasing. Between 300 ℃and 400 ℃, these parameters fluctuate locally due to the mesoscopic damage evolution of the rock samples, while the gradual increase in Poisson′s ratio confirms the synergistic effects of stiffness weakening and plastic strengthening. (3) The failure mode of the rock sample under Brazilian splitting is predominantly tensile, with pronounced central cracking characteristics as thermal damage intensifies. Under uniaxial compression, the failure mode of the rock sample changes with temperature in the following sequence: single cylindrical splitting→single inclined plane shear→V-shaped conjugate shear→multi-crack splitting exhibiting crushing features.
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2025, Vol. 44 
