高集油田高6块阜宁组剩余油分布规律

Research of remaining oil distribution rule of Funing formation,the sixth block of Gaoji oilfield

高集油田已进入高含水后期开采阶段,为了提高采收率,需要寻找剩余油开采潜力。高6块是高集油田稳产的主力区块,在对高6块阜宁组精细油藏描述的基础上,根据单井隔夹层识别、沉积微相划分、流动单元划分和剩余油饱和度计算,结合动态资料,分析总结了该区剩余油控制因素和分布规律。结果表明:垂向上不同流动单元组合与隔夹层空间配置关系会形成不同的剩余油分布模式;平面剩余油分布主要受沉积微相和流动单元的控制。通过研究,识别了高6块沉积微相差异型剩余油、小隔层遮挡剩余油、夹层型剩余油和流动单元型剩余油共4种剩余油类型,其中小隔层、夹层封挡的砂体内部,河道侧翼溢岸砂沉积及Ⅱ类、Ⅲ类流动单元是剩余油的富集区。

Abstact:At present,the Gaoji oilfield has gone into middle and later stage of exploration.In order to enhance the oil recovery,it is necessary to study the potential of remaining oil.The sixth block is the main block of stable production in Gaoji oilfield.On the basis of fine reservoir description of the sixth block,the Funing formation,based on the research of sedimentary micro-facies,interbeds and flow units in Funing formation of the sixth block,combined with dynamic data,the controlling factor and distribution modes of remaining oil in this area,is analyzed thoroughly herein.The results show that in the vertical section,different combinations of flow units and space allocating relation of interbeds can form different remaining oil enrichment modes;while,on the plane,the remaining oil distribution is mainly determined by sedimentary micro-facies,distributing feature of flow units and plane heterogeneity.On the basis of the identification and distribution on formation mechanism of remaining oil,4 remaining oil types are distinguished in this area,which are micro-facies differential remaining oil,small barrier remaining oil,interlayer remaining oil and flow units oil.Within the sand body of small barrier and interlayer,the overflow shore sand deposition on the wing and space ofⅡ,Ⅲflow unit is enrichment area of remaining oil.On the remaining oil distribution research,it can improve the effect of sixth block by means of injection and ensure Gaoji oilfield's production.