河口坝砂体构型精细解剖

综合应用高分辨率层序地层学理论和储集层构型分析法，以济阳坳陷东营凹陷胜坨油田胜二区沙二段8砂层组为例，对河口坝构型进行研究。通过层次分析，将河口坝分为3种级次；河口坝复合体，单一河口坝，河口坝内增生体。中期基准面旋回、短期基准面旋回及超短期基准面旋回分别控制这3种级次砂体构型的发育。沙二段8砂层组的3个中期基准面半旋回水体由深变浅的过程回控制了3套反韵律河口坝复合砂体的形成；每个中期旋回内部又发育若干由短期基准面旋回控制的单一河口坝砂体，这些砂体垂向相互叠置，形成向湖盆方向斜列的一系列砂体；单一河口坝砂体内部发育河口坝增生体。河口坝复合砂体间发育水平泥质隔夹层，单一河口坝砂体之间发育斜交隔夹层，增生体之间局部发育水平夹层或斜交夹层，对剩余油分布有较大影响。在上述研究的基础上，建立了河口坝储集层构型模式。

Detailed architecture analyses of debouch bar in Shengtuo Oilfield, Jiyang Depression

The architecture analyses and high-resolution sequence stratigraphic theories are applied to synthetically study the architecture of debouch bar in Shengtuo Oilfield, Jiyang Depression, in which the debouch bar is identified as a three-grade sand body consisting of combined debouch bar, single debouch bar and inner accretion layering of debouch bar, whose developments are controlled by the middle base, short base and ultra short base level cycles, respectively. The Es2^8 Formation is subdivided into three middle base level cycles and constructs three sets of reversed grading combined debouch bars. The middle cycle consists of several short cycles that form the single debouch bar. The later debouch bar overlaps the former, forming a serial of sand bodies inclining to the basin. The inner single debouch bar develops accretion sand bodies. There are horizontal barrier beds in combined debouch bar, while the single debouch bar develops oblique barrier beds and local accretion sand develops oblique or horizontal barrier beds, which greatly influence the remaining oil distribution. The architecture model of debouch bar is established.