Effect of Stress Loading on Permeability of Granite Rough Fissure
Selecting Indosinian granite in thermal storage layer of hot dry rock targets in the Gonghe basin,Qinghai Province,as the goal layer,using high pressure fluid displacement experiment device,the core fissure seepage and stress coupling loops and unloading test was carried out in this study.The influence law of stress loading process on granite rough fracture permeability was analyzed,and the evolution characteristics of granite fracture permeability in the experimental process were analyzed by numerical simulation technology.The results show that:(1)stress loading leads to deformation of fracture contact surface,which is the main factor affecting fracture seepage,and fracture permeability is negatively correlated with confining pressure.(2)The sensitivity of fracture permeability to different stress loading modes is different;(3)The mathematical empirical formula is obtained on the basis of the test,and the seepage evolution law in the granite fracture channel is analyzed by numerical simulation.The simulation results fit well with the experiment.
granitestress loadingfracture permeabilityseepage and stress couplingnumerical simulationgeothermal energy
NETL
NSTL
万方数据
