The high water cut sandstone oilfields in Kazakhstan involve the MMG project, the PK project and the related oilfields of the North Buzzaki project. After long⁃term water flooding, these oilfields have entered a stage of rapid decline, low⁃efficiency and high water cut. Taking the North Buzzaki oilfield as an example, this paper addresses the characteristics of remaining oil distribution by comprehensive analysis of material balance, log interpretation, performance, water channel and numerical simulation in order to improve remaining oil recovery in high water cut sandstone oilfield. The results show that, longitudinal distribution of remaining oil is affected by sedimentation rhythm and heterogeneity, differently enriched in layers and in⁃between layers, and laterally enriched in those sites of weak conformance as a result of sedimentary environment and petrophysical properties. Combined with the characteristics of water flooding and the characteristics of remaining oil enrichment, adjustment measures are formulated to maximize both recovery factor and economic benefits during the contract period.