大庆油田北部发育砂质辫状河道、曲流河道、高弯度分流河道和低弯度分流河道等砂体类型。以井间可对比的单一河流沉积物为研究单元 ,从河流相储层成因特征入手 ,应用油田开发后期密井网资料开展各类河流砂体细分微相研究。重点阐述了各类砂体的规模、宽厚比、发育的主要微相、物性特征及层内非均质特点。应用不同时期密闭取心检查井资料、测井水淹解释、生产动态测试资料 ,结合不同砂体和微相的非均质特点研究了不同微相的水淹变化特征。研究结果表明 ,不同阶段各类砂体层内及平面水淹变化特征不同 ,高含水后期剩余油主要分布于河间薄层砂、部分决口水道和废弃河道微相中 ,低弯度分流河道砂体中剩余油相对发育 Sandy braided channels, meandering channels, high-curvature distributary channels and low-curvature distributary channels are developed in the northern part of Daqing Oilfield. Based on single fluvial sediments that can be compared between wells, this paper starts from the genetic characteristics of fluvial facies reservoirs and applies various types of microfacies of various types of river sand bodies to study the close-well network data of late stage of oilfield development. The scale, width-to-thickness ratio, main microfacies, physical properties and intra-layer heterogeneity of various sand bodies are elaborated. The characteristics of water flooding in different microfacies are studied by using the data of closed coring wells, logging flooding interpretation and production dynamic test data in different periods and combining the heterogeneity of different sand bodies and microfacies. The results show that the variation characteristics of in-plane and in-plane flooding in different sandstone layers are different in different stages, and the remaining oil in the later stage of high water-cut is mainly distributed in the thin sand of the Hejian River, part of the breach channel and the abandoned channel microfacies, The remaining oil is relatively developed