研究结果表明，气顶油藏顶部注氮气重力驱可以有效地提高采收率，达到降水增油的效果；
The results show that oil recovery can be enhanced effectively by gravity drive of crestal nitrogen injection for increasing oil production and decreasing water cut.
数值模拟的结果表明：压力场与重力场均具有驱油能力，而压力场是当前主要的驱动势场。
The result of numerical simulation shows that pressure field and gravity field can both drive oil, but the pressure field is the main driving potential currently.
剩余油的数量、分布情况受油层沉积韵律类型、重力作用、毛管力作用、油层渗透率、水驱强度等多种因素的制约。
The quantity and distribution of remaining oil are dominated by the type of deposit rhythm, gravity and capillarity force, permeability and water flooding degree.
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