Abstract: The Ordovician carbonate reservoir in Yingmai?2 structure of Tarim basin is an efficient development block with constructed productivity of 20×104 t, but it is still uncertain for its oil?water contact and reservoir type by far, which restricts the reasonable exploitation of the reservoir. This paper presents re?examination of the data from 12 oil wells with vertical depth over 6 100 m and suggests that Yingmai?2 reservoir is a block and bottom water reservoir controlled by structure and reservoir rocks, with relatively unified oil?water contact located at about ?5 110 m ASL. It is concluded that in the Ordovician in Tabei area there exist two types of reservoirs, one is quasi?layered reservoir which could be found in areas with stratigraphic dip angle of less than 2.0°, the other is block and bottom water reservoir with larger dip angles (6.2° in average) and background of traps, and the hydrocarbons in them are easier to migrate and accumulate along vertical direction