河控三角洲河口坝储层内部隔夹层分布样式研究

Patterns of Barrier-interlayers in Mouth Bar of Fluvial Dominated Delta Reservoirs

以胜坨油田二区沙二段8砂组为例,利用丰富的岩芯、动态监测资料及密井网条件,采用层次约束和动态拟合的研究方法,分析河口坝储层内部隔夹层的类型、成因和表征级次,讨论不同级次隔夹层的发育位置、沉积产状、规模及分布样式。研究表明,河口坝储层内部发育泥质、物性隔夹层和钙质夹层3类。5级界面处的隔夹层限定河口坝复合体,位于复合河口坝顶部,泥质、物性隔夹层侧向拼接,呈连片状,沿单层较连续分布,钙质夹层延伸规模小,呈孤立状,离散分布;4级界面处发育泥质夹层、物性夹层和钙质夹层,限定单一河口坝,位于单一河口坝相互叠置处,顺单一河口坝顶部延伸,侧向与5级界面斜交,离散分布;3级界面处的泥质夹层、物性夹层和钙质夹层,限定单一河口坝内部的增生体,数量多,厚度薄,分布离散,向湖心方向以低角度倾斜。

Taking the Es82Formation in the second district of Shengtuo Oilfield as an example,using the cores,dynamic monitoringdata and dense well condition,this paper adopts the research methods of hierarchical control and dynamic fit.It analyzesthe types,causes and architecture hierarchy of barrier-interlayers in the mouth bar.It also deeply discusses the position,shape,extending scale and distribution patterns of barrier-interlayers in different orders.The research shows that barrier-interlayerscan be divided into three types:muddy barrier-interlayers,calcareous interlayers and physical barrier-interlayers.Five-orderbarrier-interlayers limit the composite mouth bar.Five-order barrier-interlayers which contain muddy barrier-interlayers,calcareousinterlayers and physical barrier-interlayers are located at the top of the composite mouth bar.Muddy barrier-interlayersand physical barrier-interlayers are lateral stitching,sheet size and easy to form a stable barrier.Calcareous interlayers arediscrete and non-continuous.Four-order interlayers limit a single bar.Four-order interlayers are located at the stacking part ofsingle bars.Muddy,physical and calcareous interlayers of four-order extends along the top of the single bar.They are obliquecrossing laterally and discrete.There-order interlayers limit the proliferative bodies.Muddy,physical and calcareous interlayersof there-order are multiple,thin,discrete and non-continuous.These interlayers distribute between the proliferative bodies andincline to the lake.