Abstract: Major oilfields in central-eastern China have entered into the high water-cut development stage during which about 40%-60% reserves need to be recovered.Fine description of reservoir is the most essential work for effective oilfield development; at the same time the fine description of high water-cut reservoir is of special significance for boosting production practice in oilfields and deepening understanding of production performance.Based on the detailed study on related documents both in Chinese and in foreign languages,in combination with practical experiences in typical oilfield production,we systematically introduced the status quo of the research on fine description of reservoir in high water-cut oilfield,and summarized the five main problems existing in the present research,including fine division and correlation of stratigraphy,reservoir heterogeneity,patterns of reservoir variation in the process of oilfield development,comprehensive remaining oil characterization with integration of various data,and tertiary oil recovery in high water-cut oilfields.Subsequently,several new techniques and methods with better application results now were pointed out.In addition,the focuses of present research were summarized as follows: ① fine interpretation of fracture system; ② fine characterization of reservoir architecture; ③ logging interpretation for water-flooded layers; ④ identification of preferential seepage channels; ⑤ multipoint geostatistical modeling.

Key words: reservoir heterogeneity, fracture system, fine description of reservoir, remaining oil, high water-cut oilfield