The result shows that the permeability and macropore ratio in flooding sandstone increase greatly. and the permeability and mean pore size in flooding sandstone decrease.

• 试验结果表明，岩石水洗前后气体渗透率增加、孔隙半径增大的居多；气体渗透率减小、平均孔隙半径减小者也有之，另外还有气体渗透率、平均孔隙半径变化不大的情况。