英买2构造奥陶系油藏老井复查与油水界面分析

塔里木盆地英买2构造奥陶系碳酸盐岩油藏是已建成20×104 t产能的高效开发区块，但至今对其油水界面和油藏类型仍认识不清，制约着该油藏的合理开发。对英买2油藏内12口完钻深度大于6 100 m老井的资料进行了重新综合分析，认为英买2油藏是一个受构造和储集层控制的、具有相对统一油水界面的“块状底水”油藏，油水界面在海拔-5 110 m附近。塔北地区奥陶系存在“准层状”和“块状底水”两种油藏类型。“准层状”油藏主要形成于地层倾角小于2.0°的地区，地层倾角较大（平均6.2°）的构造，油气沿垂向上的调整势能大，常形成“块状底水”油藏。

The OilWell ReExamination and the OilWater Contact Analysis of Ordovician Reservoir in Yingmai2 Structure in Tarim Basin

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