扎那若尔气顶油藏流体相态研究

PHASE RESEARCH OF ZHANAZHOL GAS-CAP RESERVOIR EXPLOITATION

气顶油藏是表述上方有天然共存的气相烃类蕴藏的油藏,它与下方的油藏和水体处于一个统一的水动力学体系中。在漫长的地质演化与赋存进程中,它们相互之间已处于水动力学平衡、热力学平衡及多组分相态平衡状态。随着我国油气田勘探开发的发展,越来越多的气顶油藏或带油环的凝析气藏相继发现,判断气顶油藏的流体类型对开发方式的选择有直接的指导意义。国内外有一些气顶油藏相态方面的报道,但系统的论述气顶油藏的类型及判断方法还较少。位于哈萨克斯坦境内的扎那若尔气顶油藏是一个比较典型特殊的未饱和油藏,在国内外目前研究这种类型的油藏还比较少,在1999年对扎那若尔油藏研究的基础上,通过目前的资料,利用相态恢复理论,对该油藏的相态进行再认识,从而为该油藏的开发方式提供可靠的依据,并且对类似气顶油藏的开发有借鉴作用。

The gas-cap oil reservoir is an oil reservoir overtopped with gas phase hydrocarbon that is in a unified hydrodynamic system with the underneath oil deposit and the water body. During the long process of the geological evolution and accumulation, the hydro-dynamics balance, the thermo-dynamical equilibrium and the multi-components phase state of equilibrium has been formed among them. Along with the development of China's oil/gas exploration & production, more and more gas-cap oil reservoirs or the condensate gas reservoirs with oil ring have been discovered one after another. The judgment of gas-cap oil reservoirs fluid type directly guides the selection of the way of the exploitation. Reports on gas-cap oil reservoir phase research have appeared both in and outside China but systematic description of gas-cap oil reservoir type and judgment method are rare. Zhanazhol Gas-Cap Reservoir is a typical un-saturated reservoir located in Kazakhstan. This kind of reservoir has rarely been studied throughout the world. Based on the research in 1999 and current data, this paper utilizes the phase recovery theory and re-studies the phases of the reservoir for the purpose of providing reliable basis for the exploitation of this reservoir and also providing references for exploitation of the similar gas-cap reservoir.