曲流河点坝内部构型精细研究及应用

Fine Research and Application of Internal Architecture in Point Bar of Meandering River

点坝是曲流河单砂体沉积单元中最重要的储集砂体，其内部侧积层是控制剩余油分布的主要因素。以港东油田二区五先导试验块为例，综合运用测井、岩心、密井网、水平井等资料，对点坝内部构型进行解剖，定量认识试验区侧积层厚度为0．2—0．3m、倾角3．5°，侧积体规模、期次、大小不一。分级次嵌套式二次加密建立构型级别精细三维地质模型，并开展了精细油藏数值模拟研究，同时结合测井、岩心、分析化验等资料，认为剩余油主要分布在砂体顶部和侧积层附近。应用地质-建模-数模-体化研究成果，指导方案部署与现场实施，取得了较好效果，为点坝内部构型精细研究提供了一套新的思路与方法。

Point bar is the most important reservoir sand of sedimentary units in meandering river, whose internal side of lateral accretion bedding is the main factors of controlling the remaining oil distribution. This paper took the pilot test Five of Area II in Gangdong oilfield as an example, dissected the architecture of point bar by comprehensive use of logging, core, dense well, horizontal wells, etc. Quantitative understanding of lateral accretion thickness is about 0.2 to 0. 3 m, inclination 3.5 °, and lateral accretion body scale sizes are different in the test area. After that, the 3 D super-fine model of inner point bar is established, through secondary infilling and embedding technology of grading times, and fine simulation studies is carried out. At the same time, logging, core, laboratory analysis, etc. are combined to find out the residual oil distribution law qualitatively, which are mainly in the top of sand and side of lateral accretion bedding. Applying geology-modeling-simulation integrated studies to setting up plan of reservoir and site implementation, good results is achieved. It provides an innovative idea and method for point bar configuration.