樊家川油田河流相储层高分辨率层序地层特征

针对河流相储层标志层缺乏、砂体叠置掘蚀严重、难以精细等时对比的难点,应用基准面旋回原理,重点解剖典型取心井及其测井响应模式,将樊家川油田主要含油层系中侏罗世延安组Y8～Y10油组划分为7个短期、3个中期、2个长期基准面旋回层序,对应于不同级次的储层成因单元,同时建立以中期旋回为年代地层格架,短期旋回为等时地层对比单元的层序地层格架,对河流相多期叠覆储层进行了精细等时划分与对比,详细分析了河流相储层短期基准面旋回类型及其叠加式样,探讨了各级基准面旋回对储层分布的控制作用。

High-resolution sequence stratigraphy features of the river facies reservoir in the Fanjiachuan oil field

The rive facies reservoir is short of symbol layer and sandbody is folded and picked,so fine isochronous sandbody compa-ring and dividing are difficult. On the basis of the theory of the base-level cycle,7 short-term cycle sequence,3 middle-term cycle se-quence,2 long base-level cycle sequence can be distinguished from the Y8～ Y10 oil formation of the principal oil-bearing ones in theYanan Formation of Middle Jurassic age. The base-level cycle sequence is corresponding to different grade genetic units. At the sametime, all graded sequence structure types,stacking patterns and chrono-stratigraphic framework are established on the basis of themiddle-term cycle sequence, and short-term cycle sequence,and the reservoir distribution by the different base-level cycle is discussed.