库车前陆盆地斜坡带牙哈地区凝析气藏形成机理  

Formation Mechanism of Condensate Gas Reservoir in Yaha Area in Slope Belt of Kuqa Foreland Basin

作　　者：罗枭[1,2,3] 姜振学[1,2] 李卓[1,2] 刘建良[4] 高甜[1,2] 陈磊[1,2] 冯洁[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学非常规天然气研究院,北京102249 [3]中国石油大学盆地与油藏研究中心,北京102249 [4]中国石油勘探开发研究院,北京100083

出　　处：《新疆石油地质》2014年第6期668-671,共4页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05003-001);国家973项目(2011CB201105)

摘　　要：我国中西部前陆盆地斜坡带油气藏以凝析气藏为主,目前对该类油气藏的成藏机理尚认识不清.以塔里木盆地库车前陆盆地斜坡带牙哈地区为例,分析了斜坡带凝析气藏形成机理,指出该地区油气藏具有典型凝析油气的特征：较高的气油比,凝析油除了密度低、黏度低外,还具有含蜡量高的特征,凝析气表现为湿气特征.通过测定与烃类伴生的盐水包裹体的均一温度,结合地层埋藏史和热史,厘定了牙哈地区油气具有两期成藏特点：原油主要在8×10^6～5×10a充注,天然气在5×106a以来,特别是3×10^6a左右充注.据此结合库车前陆盆地构造演化过程,恢复了牙哈地区凝析气藏的形成过程,并提出了“先油后气,气侵改造”的前陆盆地斜坡带次生凝析气藏形成机理.The reservoirs discovered in the slope belts of foreland basin in central-western China are mostly condensate gas reservoirs,but their hydrocarbon accumulation mechanisms are still unclear.Taking the Yaha area in Kuqa foreland basin as an example,the formation mechanism of condensate gas reservoir on this slope belt is analyzed.It is suggested that Yaha area is characterized by typical condensate oil and gas：high gas-oil ratio on the whole; low density,low viscosity and high wax for the condensate oil; wet gas for the condensate gas.Through measures of homogenization temperature of the brine inclusions associated with hydrocarbons,combined with burial history and geothermal history,it is determined that Yaha area has two periods of hydrocarbon accumulations：8× 106～5× 10^6 a for crude oil charging and 5 × 106a for natural gas charging,particularly for 3 × 10^6 a for natural gas charging.Hence,the formation process of Yaha condensate gas reservoir has been recovered,combined with the tectonic evolution history of Kuqa foreland basin,and the formation mechanism of ＂oil charging first and then gas invasion＂ for the secondary condensate gas reservoir in the slope belt of Kuqa foreland basin is proposed.

关 键 词：塔里木盆地 库车坳陷 前陆斜坡带 牙哈地区 凝析气藏 形成机理 

分 类 号：TE112.41[石油与天然气工程—油气勘探]