【Key words】 fluvial facies reservoir； heterogeneity； sedimentary model； remaining oil distribution； Zhanhua sag；
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An example of fluvial facies sandstone reservoir in a waterflood oilfield at stage of moderate-high water cuts is taken for this study, and perfect effectiveness for application is obtained.
结合实际以某注水开发中后期油田的河流相砂岩储集层为例展开研究，应用效果较为理想。
Different micro-facies units of fluvial sand bodies control the overall reservoir physical properties at high water cut stage.
河流砂体不同微相单元决定了油田高含水期储层物理特性的总体规律。
In oil field of China, fluvial and delta facies reservoir are main depositional facies type, and their geological reserve accounting for nearly 80% of total reserve of clastic rock facies.
中国油田河流相与三角洲相储层的地质储量占碎屑岩相总储量的近80%，是主要的沉积相类型。
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