岩土力学2025，Vol.46Issue(5)：1442-1454,13.DOI:10.16285/j.rsm.2024.1009
水/超临界CO2对低黏土含量砂岩力学性质影响的试验研究
Experimental study on effects of H2O and supercritical CO2 on mechanical properties of sandstone with a low clay mineral content
摘要
Abstract
Sandstone is a crucial rock type for CO2 aquifer storage.The clay minerals within it expand upon adsorbing CO2 or H2O,which affects the rock's mechanical properties and may threaten the reservoir's mechanical stability.A type of quartz-cemented sandstone with low clay content was studied.Triaxial compression experiments were performed under dry,H2O,and supercritical CO2(scCO2)saturation conditions,maintaining a constant pore pressure of 10 MPa.The effects of various fluids on the peak strength,cohesion,friction angle,and both macroscopic and microscopic failure characteristics of sandstone were compared and analyzed.Results indicated that,compared to dry conditions,scCO2 and H2O presence significantly reduced the peak strength of sandstone samples by 7.61％and 18.02％,respectively.Under different confining pressure levels,the weakening effect of scCO2 on sandstone peak strength remained nearly constant,whereas the weakening effect of H2O first increased and then decreased with rising confining pressure.The cohesion of sandstone decreased by 12.11％and 16.03％under scCO2 and H2O saturation,respectively,while the friction angle was remained nearly unaffected by the fluids.Both scCO2 and H2O reduce the failure angle of sandstone.关键词
CO2地质封存/砂岩/黏土矿物/三轴压缩/力学性质Key words
CO2 geological storage/sandstone/clay mineral/triaxial compression/mechanical property分类
建筑与水利引用本文复制引用
吴青钱,石露,李小春,白冰..水/超临界CO2对低黏土含量砂岩力学性质影响的试验研究[J].岩土力学,2025,46(5):1442-1454,13.基金项目
国家自然科学基金-地质联合基金重点项目(No.U2344226)This work was supported by the Key Projects of the Geology Joint Fund of the National Natural Science Foundation of China(U2344226). （No.U2344226）
