In view of upper Guantao sandbody in west block7 of Gudong oilfield, hierarchical interfaces of the sandbodies in the studied area are classified and recognized on the basis of core observation and dynamic analysis，and the study indicates that the effective permeability of long axis positive side and center of mid-channel bar are more favorable, and the effective permeability of sideband of mid-channel bar is lower, so sideband of mid-channel bar may concentrate the remaining oil. The experimental data is used to characterize how the log response is affected by polymer, and the study also indicates that the log response is not effected by the polymer, but it is affected by the polymer small clumps which are accumulated by polymer containing clean water due to uneven driving, and the polymer small clumps mainly appear at sideband of reservoir architecture, and the log response of polymer small clumps is high in resistance. So, the reservoir architecture and the well logging analysis techniques are used to identify the remaining oil. The research report indicates that the sideband of reservoir architecture cell can concentrate remaining oil or polymer, C/O well logging or other methods that can identify oil and polymer are suggested to be used.