摘要：In this paper,we use the steady-state permeability test method to conduct the aging and effective stress experiments of tight sandstone rock samples.The results show that the properties of the rock are more stable after the aging experiment.Rock permeability increases with decreasing confining pressure and decreases with decreasing pore pressure.Under high confining pressure,the change of rock permeability with pore pressure is small,and under low confining pressure,the change of rock permeability with pore pressure is large.The rock permeability under different confining pressures and low pore pressures was corrected for slippage,and it was found that the slippage factor increased with increasing confining pressure.This indicates that the greater the confining pressure,the more severe the slippage effect on permeability.The ESCK value of all samples is less than 1.0.ESCK shows two kinds of changes: (1) ESCK is a constant,which basically does not change with confining pressure and pore pressure,it shows the characteristics of pore type rock; (2) ESCK is a variable,and it decreases with the increase of confining pressure and increases with the increase of pore pressure,which shows the characteristics of fractured rock.The fitting results show that ESCK has a good functional relationship with Terzaghi effective stress.ESCK and Terzaghi effective stress have two kinds of changes: (1) ESCK is a constant,basically does not change with Terzaghi effective stress; (2) ESCK decreases with the increase of Terzaghi effective stress.
