Slow-slip evolution of injection-induced shearing on granite fracture
摘要:Shear slip of fractures/faults induced by pressurized fluid injection has been recognized as an important mechanism in reservoir stimulation and induced earthquake. A lab-scale physical simulation of fluid injection-induced shearing is still lacking to understand the slip evolution under reservoir conditions. In this study, triaxial injection-induced shear tests were conducted on cylindrical granite samples that contain an inclined and embedded fracture. The aim is to close enough to simulate the natural fracture properties, in-situ stress, and temperature conditions. Results demonstrate three visible slip stages from static friction to unstable slip. Variable normal stress and its response to a sudden change in shear stress was observed from the acquired pulse data. Moreover, slowly stick-slip friction dominates the injection-induced shearing in the velocity of tens of micrometers per second. Friction stability analysis indicates that the aseismic and seismic creeps alternatively appear, which reveals the complexity of induced shear friction. Our results confirm that the fluid injection-induced shearing is a type of variable normal stress, stick-slip, and slow slip friction.
Copyright 2019 ARMA, American Rock Mechanics Association.
发表日期:2019-01-01
期刊分区(SCI为中科院分区):无
收录情况:国际学术会议论文集
发表期刊名称:53rd U.S. Rock Mechanics/Geomechanics Symposium
通讯作者:徐志鹏,李璞
第一作者:盛茂,田守嶒
论文类型:会议论文
论文概要:盛茂,徐志鹏,李璞,田守嶒,Slow-slip evolution of injection-induced shearing on granite fracture,53rd U.S. Rock Mechanics/Geomechanics Symposium,2019,
论文题目:Slow-slip evolution of injection-induced shearing on granite fracture