凝析气藏相态特征及开发方式研究进展

Research Progress on Phase Behavior Characteristics and Development Mode of Condensate Gas Reservoir

凝析油气藏是在一种介于油藏和纯气藏之间的特殊油气藏,具有资源量大、品质好、采收率高、炼化工艺简单等优点。凝析气藏在全球分布范围广,但因其独特的反凝析现象和相态特征,在制定开发方案时始终存在一系列的难题。本文总结凝析气藏形成条件,明确成藏过程中随着温压系统变化凝析气藏的相态变化规律以及分布模式。以全球大型的凝析气藏为例,分析了典型凝析气藏的分布规律、主要层系、储层类型、气体组分以及形成的主控因素。针对凝析气藏特殊的相态特征和温压条件,综合分析各类开发方式的适用条件以及优缺点。该研究为塔里木盆地塔中北坡地区凝析气藏的勘探开发提供了技术和理论支持。

Condensate oil and gas reservoir is a special oil and gas reservoir between oil reservoir and pure gas reservoir.It has the advantages of large resources,good quality,high recovery efficiency and simple refining and chemical process.Condensate oil and gas reservoirs are widely distributed in the world,but because of their unique anti condensation phenomenon and phase behavior characteristics,there are always a series of problems in formulating development plans.The formation conditions of condensate oil and gas reservoir are summarized,and the phase state change and distribution mode of condensate gas reservoir with the change of temperature and pressure system in the process of reservoir formation are clarified.Taking the global large-scale condensate oil and gas reservoirs as an example,the distribution law,main strata,reservoir type,gas composition and main control factors of the formation of typical condensate gas reservoirs are analyzed.According to the special phase characteristics and temperature and pressure conditions of condensate gas reservoirs,the applicable conditions,advantages and disadvantages of various development methods are comprehensively analyzed.This study provides technical and theoretical support for the exploration and development of condensate oil and gas reservoirs in the North Slope of Tazhong,Tarim Basin.