复合韵律油藏纵向非均质影响数值模拟研究

Effect of Vertical Heterogeneity on Oil Displacement Efficiency in the Compound Rhythm Reservoir by Numerical Simulation

非均质性是储层成岩、沉积等地质过程综合作用的结果。它是影响油气田产量、最终采收率的重要因素。研究以渗透率变异系数、突进系数及级差等三个渗透率参数为基础,在建立的油藏机理模型中定量地表征储层纵向非均质性强度,并运用数值模拟方法分析了纵向非均质性强弱对复合韵律底水油藏剩余油饱和度、含水上升规律及采出程度的影响,从而总结出纵向非均质性对复合韵律底水油藏驱油效率的影响规律。

Heterogeneity is described from the comprehensive effect of reservoir deposition and diagenesis in the geological process. It is the most important factor to influence the ultimate recovery,and the production of oil and gas field. The research based on three permeability parameters such as the permeability differential,the coefficient of permeability variation and permeability dash,characterized the strength of vertical heterogeneity in reservoir quantitatively in the mechanism model. It also analyzed the effect of the vertical heterogeneity on the saturation of remaining oil,the incremental law of water cut and the degree of reserve recovery in compound rhythm reservoir with bottom water by use of numerical simulation method. Then the effect law of vertical heterogeneity on oil displacement efficiency can be summarized.