关键词: 相对渗透率, 油藏数值模拟, 特征曲线, 含水饱和度, 油层物理

Abstract: The common relative permeability curves weve divided into three types of type-Ⅰ,type-Ⅱand type-Ⅲ relative permeability curves.The investigation of 70 relative permeability curves shows that all relative permeability curves have the same characteristic.When any relative permeability curve was plotted in a semi-log graph paper,the relative permeability could be showed by logarithm coordinate,and the water saturation was showed by ordinary coordinate.When certain modification factors were introduced,a straight line could be achieved and defined as the relative permeability eigen curve.The relative permeability and water saturation fulfills linear equation.The three types of relative permeability curves have the same format of eigen curve.The relationship between connate water saturation and air permeability,the relationship between water saturation at residual oil point and air permeability,and that between oil phase relative permeability at connate water saturation point and air permeability were determined.Based on these relationships,relative permeability eigen curve method can be used to produce relative permeability curve for every grid block of reservoir numerical simulation and significantly improve the reservoir numerical simulation

Key words: relative permeability, reservoir numerical simulation, eigen curve, water saturation, reservoir physics