渤海湾盆地K油田复合砂体解剖及其对油田开发的意义

The Anatomy of Compound Sand Body in K Oilfield of Bohai Basin and Its Significance for Oilfield Development

摘要: K油田位于渤海海域南部，主力含油层位为新近系明化镇组，沉积相为浅水三角洲沉积，多期分流河道相互切割、交错叠置，纵横向展布状态十分复杂。该油田勘探评价阶段以层状构造油藏模式计算储量，储量单元边界不确定性强，储量在空间的分布并未确定，开发井位部署困难重重。本文以地震反演资料为基础，采用断、叠的纵横向砂描技术，结合浅水三角洲沉积储层分布规律，解剖复合砂体内部结构，确定了3种结构关系，落实了储量在空间上的分布状态，并此形成了针对复合砂体的3种分布模式采用不同井网开发的井位部署方法，有效提高了该油田的经济效益。

Abstract: K oil field is located in the south of the Bohai Sea. The main oil-bearing strata are the Neogene Minghuazhen formation, and the sedimentary facies are shallow delta deposits. The distributary channels of multiple stages cut each other, crisscross and superpose, which makes the distribution in the vertical and horizontal very complex. In the exploration and evaluation stage of this oilfield, the reserves are calculated in the form of layered structural reservoirs. The boundary of the reserves unit is highly uncertain, and the distribution of reserves in space is not determined. In this paper, based on the seismic inversion data, the 3 types of structure relationship among sand bodies in the compound sand body have been analyzed using sand tracing technology, the distribution of the reserves on the space has been determined, and in view of the three distribution modes of composite sand bodies, different well patterns were adopted to develop, which effectively improved the economic benefits of the oilfield.