厚油层层内夹层对剩余油的影响研究

Study on the influence of intercalation on remaining oil distribution in thick reservoirs

厚油层层内夹层是控制剩余油分布的主要因素之一。以北一区东中块葡Ⅰ组油层为例,分析了厚油层层内夹层的分布特征,并对夹层控制下的剩余油分布特征进行了描述。同时,利用北一区断东中块相关资料建立数值模型,采用数值模拟方法,应用正交试验分别研究了侧积夹层、水平夹层不同发育形态下的剩余油分布状况。结果表明,侧积夹层逆夹层注水、水平间距及倾角越小,遮挡区域的纵向驱替面积越小,剩余油越富集;而水平夹层数量越多,位于油水井异侧,因夹层的隔挡作用,易形成剩余油富集区。

Intercalation in thick reservoirs is one of the major factors controlling remaining oil distribution.This paper analyzes the distribution characteristics of intercalations in thick reservoirs and describes remaining oil distribution controlled by intercalations based on the data of the North 1 Area.A numerical model has been established and orthogonal tests have been conducted to study remaining oil distribution under different shapes of angular and horizontal intercalations.Statistical analysis of the result shows that when water injection is inverse to the direction of angular intercalation,the shorter the horizontal interval is and the smaller the inclination is,the more enriched the remaining oil is;the more the number of horizontal intercalations is,the locations to the other sides of oil/water wells are more likely to remain oil as impeded by intercalations.