束缚水饱和度与临界水饱和度关系的研究

应用测井资料解释、压汞法及相对渗透率实验资料，对扎尔则油田F油藏的含油饱和度与油藏高度及产水率的关系进行了研究，分析了束缚水饱和度与临界水饱和度的不同及其渗流机理。分析结果表明，在束缚水饱和度状态至临界水饱和度状态之间，可动水主要分布在微小孔道内，不能形成连续的可动水路，仍产纯油，离心法相对渗透率实验所确定的束缚水饱和度应为临界水饱和度。对储层微观渗流特征进行了分析，结果表明束缚水饱和度要小于等于临界水饱和度。

Study of the relation between immobile water saturation and critical water saturation

Using the log interpretation, mercury intrusion method and relative permeability curves study the relation between oil saturation and reservoir height and water cut of F oil reservoir in Zarzaitine Oilfield. The difference between the irreducible water saturation and critical water saturation and their flowing mechanisms are analyzed. The results indicate that moveable water mainly distributes in minute throat of pore at the state between the irreducible water saturation and critical water saturation, which cannot form consecutive road of moveable water. The oil reservoir still produces pure oil. The irreducible water saturation determined by centrifugal experimentation of relative permeability is the critical water saturation. Analysis of the micro-cosmic percolation characteristics of reservoirs shows that the irreducible water saturation should be less or equal to the critical water saturation.