Abstract: Considering the production situations of braided fluvial sandbodies at late high water-cut stage under dense pattern condition in Daqing Sabei Oilfield，the hierarchy analysis method combined with matching model is applied in subsurface architecture anatomy.According to this method，three aspects of braided fluvial sandbody including sedimentation model，intercalated bed style，intercalated bed spread scale are identified and analyzed.The sedimentation model that channel sand dam forms large-scale sandy flat or overlap extensive sandbody on surface are described.Based the sedimentation model，intercalated bed is divided into three types and it′s spread scale is identified.Based on these achievements，3D reservoir architecture model and petro physical property models are established with the target algorism.The remaining oil potential is little in braided fluvial sand bodies at late high water-cut stage.The results show that intercalated bed spread scale is between 90m and 140m.Inner layer subdivided water shut-off in nineteen oil wells for different types of remaining oil have achieved better effects.This paper will serve as a guide for tapping the potential of in-layer remaining oil during late oilfield development periods.

Key words: braided fluvial sandbody, internal configuration, geological modeling, interlayer remaining oil, potential-tapping measures