流动单元的划分及其在聚驱开发中应用

Division of Reservoir Flow Unit and Its Application in Waterflooding Development

将模糊聚类分析方法与储层类型和开发实践相结合,把大庆油田萨北开发区北二西葡一组的6个沉积单元划分成4类流动单元。流动单元的划分成果用于指导聚驱开发后期措施调整,取得了很好的效果。同时把不同流动单元的剩余油分布情况给出,相邻流动单元所处微相不一致,不同微相带之间的结合部位及微相边缘的流动单元内剩余油饱和度非常高;Ⅰ类流动单元与Ⅱ类流动单元相比,水驱后上部还存在相当数量剩余油;因为平面非均质性严重挖潜十分有难度,流动单元过渡带剩余油饱和度非常高。

Six sedimentary units of Beierxi-Puyizu in Sabei developed area of Daqing oilfield were divided into four flow units by fuzzy clustering analysis based on reservoir types and development practice. Divided results were used to guide adjustment of polymer flooding measures at the later stage, better results were obtained. Residual oil distribution of different flow units was given. The microfacies of neighbouring flow units are different, flow unit of facies margin belt and binding site between different microfacies has high residual oil saturation. Compared with typeⅡflow units, typeⅠflow units have considerable amount of residual oil. It is difficult to tap residual oil because of strong plane heterogeneity, so the residual oil saturation of intermediate belt of flow units is very high.