Periodic oscillation method is a new method for permeability measurement of porous media. It exhibits advantages of short testing period

good stability and high precision. However

it has not been widely used for low permeability measurement in laboratory due to lack of systematic research. In this paper

the effects of different porosities and medium permeabilities on the permeability measurement results of the periodic oscillation method are numerically analyzed. In addition

the applicability of different forms of periodic waves in the permeability measurement is discussed. Conclusions from the study results can be drawn as follows. First

both the porosity and permeability can affect the process of gas pressure transfer. Second

the initial pressure equilibrium process in medium may not be needed for the periodic oscillation method as the measurement results are almost unaffected by the initial pressure distribution after a certain period of time. Third

compared with sinusoidal wave

square wave exhibits a more notable influence on the pressure response of the downstream gas. Moreover

it is observed that square wave

triangular wave and sawtooth wave are easier to be loaded in practice. Finally

based on the numerical analysis

it is suggested to use the square wave instead of sinusoidal wave in the periodic oscillation method. This study will be helpful to guide the application of the periodic oscillation method test in low permeability measurement.