Repeated injection and production of reservoir fluids had led to the change of pressure difference inside and outside of pores and the change of rock compressibility, porosity and permeability.

• 油气藏流体反复注采，使得孔隙内外压差不断变化，导致岩石压缩系数、孔隙度、渗透率等物性参数也在不断发生变化。