Abstract: Huan127 oilfield has been in extra high water cut period,but even there is high potential of remaining oil.For the complex water flooding feature,the water intrusion and water influx rate are tested,and the water flooding feature analyzed.It is concluded that the main reason is bottom water coning,then is underscreen water channeling and fault water flooding.Water flooding extent is different in different part of the area.Edge water does not result in water flooding.Based on study of water flooding features,according to dynamic test and numerical simulation,remaining oil distribution of this block is studied in detail.Remaining oil is mainly separated in these areas,i.e.,big effective thickness and high initial reserves area;relative high effective thickness but less explorative well area,reservoir peripheral and some less production efficiency area.The research above can provide geologic basis for oilfield adjustment and potential tapping.

Key words: Huan127 Oilfield, heavy oil reservoir, sedimentary microfacies, water flooding feature, remaining oil, Liaohe rift