Through the microscopic oil displacing experiment,core oil displacing experiment and the seepage theory analysis,the microscopic seepage laws of the water flooding were clarified,the distribution characteristics of the microscopic remained oil after water flooded were quantified,and the mechanisms of improving the water flooded effects and enhancing the recovery ratio were proposed.The start-up pressure of the remained oil after water driven should be overcome,according to the mechanisms of the oil displacement,the remained oil after the water drive can be divided into two types:the remained oil controlled by the adhesion force and the oil dominated by the capillary force and viscous force,and moreover the latter is more than 90％.By increasing the displacing pressure gradient,reducing the interfacial tension and increasing the viscosity of displacing system can enhance the recovery factor of the oil reservoir.%通过微观驱油实验、岩心驱油实验及渗流理论分析,明确了水驱微观渗流规律,量化了水驱后微观剩余油分布特征,提出了改善水驱效果及提高采收率方法机理.水驱后剩余油启动需要克服启动压力,按照驱油机理划分,水驱后剩余油可划分为受黏附力控制的剩余油和受毛管力、黏滞力控制的剩余油2种类型,其中受毛管力和黏滞力控制的剩余油占90％以上.通过增加驱替压力梯度、降低界面张力启动和增加驱替体系黏度可以提高油层采收率.
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