复合河道砂体叠置样式与剩余油主控因素研究

Study on Superimposition Patterns and Main Remaining Oil Control Factors of Channel Sand-bodies

针对复杂多变的陆相曲流河沉积砂体,以储层构型研究理论为指导,综合运用岩心、密井网、测录井、开发动态等资料,深入剖析复合河道砂体空间配置关系。按单河道期次和隔夹层发育程度,从沉积速率与可容纳空间比值角度,对港西油田三区复合河道砂体叠置样式分析,结果表明,本区共有孤立型、桥接型、叠加型、切叠型和复合型5种砂体接触类型,其中孤立型和桥接型又按期次细分为2种样式。除孤立型砂体外,其余接触类型砂体均有不同程度的剩余油富集,受沉积韵律与隔夹层的影响,点坝内部隔夹层附近和切叠型砂体成为复合河道砂体内部剩余油的主控因素。

The spatial contact relationship of channel sand-bodies was analyzed according to the reservoir configuration theory and the core,dense well pattern,logging and dynamic development data. The superimposition patterns of the channel sand-bodies in the block 3of Gangxi Oilfield were analyzed based on the stage of single channel,the development degree of interlayer and the ratio of deposition rate and accommodation space,and the result shows that there are 5 contact relationships of channel sand-bodies in the study area,that is,isolated,bridging,superposed,cut-superposing and compound. The isolated style and the bridging style are subdivided into 2 types according to the stage of sand-bodies. In addition to the isolated sandbody,there is different extent of remaining oil in other 4 types of sand bodies,which is controlled by sedimentary rhythm and interbed,and the interbeds in meandering point bar sand-body and the cutsuperposing type sand-body are main control factors of remaining oil in the channel sand-bodies.