三角洲前缘储层构型及对剩余油分布的影响——以鄂尔多斯盆地白豹油田为例

为了深入探查三角洲前缘储层构型特征及剩余油分布,针对鄂尔多斯盆地白豹油田白157区储层非均质性强、剩余油分布复杂等特点,充分利用岩心、测井等资料,对储层内部构型进行深入分析,阐明了三角洲前缘储层构型要素的类型和特点,对单一砂体边界具有4种识别方法,提出了垂向和侧向上构型要素的叠置模式,在垂向上主要分为侵蚀冲刷型、叠置相望型和孤立型,在侧向上可分为侧向相切型和侧向相隔型两种。不同构型要素剩余油富集不同,反韵律河口坝砂体具有上、中、下三种剩余油富集模式,正韵律水下分流河道砂体剩余油一般集中在中上部。

Reservoir architectures and the impact on remaining oil distribution of delta front——A case study on Baibao oilfield in Ordos basin

In order to explore delta front reservoir architecture features and the remaining oil distribution,due to the strong reservoir heterogeneity and the complex characteristics of remaining oil distribution on Bai 157 well block of Baibao oilfield in Ordos basin,by making full use of cores,well logging and production data,thorough the research on the reservoir internal architecture,the types and characteristics of delta front reservoir architecture elements were clearly introduced.Boundaries of a single sand body has four recognition methods and the superimposed pattern on the vertical and lateral configuration elements were put forward.In vertical direction,it was mainly divided into erosion type,overlapping and isolation type.In side direction,it could be divided into two types,namely lateral tangential type and lateral separated type.The residual oil enrichment of different configurational elements was different,and there were three models of distribution of remaining oil in anti-metrical estuarine dike body,top,middle and bottom models.While in the normal rhythm of the underwater distributary channel,the remaining oil was generally concentrated in the upper part of the middle.