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本文通过对比大庆长垣北部各油田砂岩岩样水驱（冲）前后的岩心分析资料、压汞资料，结合扫描电镜观察，阐述了砂岩油藏岩心在注水过程中，孔隙结构的变化——渗透率增加、结构系数减少、退出效率降低；分析了产生这些变化的原因；指出了这种变化可能有利于提高水驱油效率。
By comparing the core analysis data and mercury intrusion data before and after the sandstone-like waterflooding (red) in the oil fields of the northern part of the Daqing Changyuan Oilfield, the changes of the pore structure during infiltration The rate of increase, the decrease of the structure coefficient and the withdrawal efficiency; the reasons for these changes have been analyzed; and it is pointed out that such changes may be beneficial to improve the efficiency of water flooding.