真三轴条件下砾岩力学特性试验

WEI Jun,LIAO Hualin,WANG Huajian,CHEN Jingkai,LI Ning,LIANG Hongjun,ZHANG Duanrui,LIU Chuanfu,TENG Zhixiang

Journal of China University of Petroleum(Edition of Natural Science)（2022）

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Abstract

塔里木盆地库车山前构造带油气资源丰富,开发潜力巨大,地质条件复杂且发育有巨厚砾石层,砾石体积分数高、强度大、分布范围广,导致钻遇岩层非均质性强、地应力高,极大地提高了钻井难度,降低了破岩效率,严重制约了开发进程.为研究不同载荷状态下砾岩的强度及破坏特征,采用砾岩露头开展真三轴试验,并对试样进行CT扫描.结果表明:三向载荷作用下砾岩的破坏过程及其强度特征受水平主应力影响显著,主要表现为脆性破坏,强度随水平主应力呈线性增长,而真三轴弹性模量受水平主应力影响较小,且其平均值小于单轴弹性模量;受砾岩非均质性和组分强度差异影响,基质的变形导致砾石颗粒承受力矩并形成剪切破坏和裂纹绕砾发展,最终导致砾岩的宏观破坏.

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