Numerical simulation of fault activity owing to
hydraulic fracturing
Hu Jun;Cao Jun-Xing;He Xiao-Yan;Wang Quan-Feng;Xu Bin
【期刊名称】《应用地球物理（英文版）》 【年(卷),期】2018(015)003
【摘要】We built a three-dimensional model to simulate the disturbance of the stress field near the reverse fault in Zhaziao,Leyi Township owing to hydraulic fracturing.The pore pressure,and shear and normal stresses during fracturing are analyzed in detail.Input rock mechanics parameters are taken from laboratory test data of shale samples from the study area.The simulation results suggest that after 16 hours of fluid injection,the pore-pressure variation can activate the reverse fault,i.e.,we observe reverse slip,and the shear stress and displacement on the fault plane increase with time.The biggest stress-strain change occurs after one hour of fluid injection and the yield point appears about 0.5 h after injection.To observe the stress evolution in each section,the normal displacement on the boundary is constrained and the fault plane is set as nonpermeable.Thus,the sliding is limited and the shear displacement is only in the scale of millimeters,and the calculated magnitude of the induced earthquakes is between Mw-3.5 and Mw-0.2.The simulation results suggest that fluid water injection results in inhomogeneous fracturing.The main ruptured areas are
Numerical simulation of fault activity owing to hydraulic fracturing
