松辽盆地幔源CO_2分布规律与运聚成藏机制  

Distribution and migration-accumulation mechanism of mantle-derived CO_2 in Songliao Basin

作　　者：鲁雪松[1,2,3] 宋岩[1,2,3] 柳少波[1,2,3] 马淑芳[1] 魏立春[4] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气集团公司盆地构造与油气成藏重点实验室,北京100083 [3]提高采收率国家重点实验室,北京100083 [4]中国石油大学盆地与油藏研究中心,北京102249

出　　处：《石油学报》2009年第5期661-666,共6页Acta Petrolei Sinica

基　　金：中国石油天然气股份有限公司重大科技专项(07-02Z-01-01)资助

摘　　要：对CO2碳同位素组成和3He/4He值分析表明,松辽盆地高含CO2天然气藏中的CO2皆为幔源成因。在对已发现含CO2天然气分析的基础上,研究了松辽盆地CO2在含量、层系和平面上的分布规律。研究结果表明,松辽盆地CO2在含量上具有"两端元"的分布特征;受区域盖层和储层性质的控制,在层位上,CO2主要富集于营城组和泉四段;在平面上,CO2呈多个点状或狭长带状局限分布,其平面分布明显受控于深大断裂,与基底大断裂和火山岩体具有较好的伴生关系。幔源CO2运聚成藏机制可概括为:深部热流底辟体的顶部是CO2的储集库,基底大断裂向下收敛于拆离带并沟通CO2气源,CO2通过基底大断裂和古火山通道向上输导,并在适当圈闭中聚集成藏。运聚通道组合类型决定了气藏中CO2的含量及含CO2天然气的赋存层位,幔源CO2的运聚通道可划分为3种组合类型。建立了松辽盆地含CO2天然气藏的"三阶段"成藏模式。The analysis on identifying indicators,such as CO2 carbon isotope and 3He-to-4He ratio,shows that the high content CO2 of gas reservoir in Songliao Basin can be distinguished as mantle origin.The content of CO2 is characterized by two points of low and high.CO2 is mainly concentrated in Yingcheng Formation（K1yc） and the forth member of Quantou Formation（K1q4） and controlled by regional cap rocks and reservoir quality.In the plane,CO2 is locally distributed in point shape or thin-and-long banded shape and distinctly controlled by deep-large faults, which is associated with the large basement faults and volcanic rock bodies. The migration and accumulation mechanism of CO2 was illustrated as follows. The top of deep heat-flow piercement is full of CO2, and the large basement faults converge downward to the detachment zone and communicate CO2 gas source. Then, CO2 migrates upward the proper traps through basement faults and ancient volcanic conduits. The migration pathways of mantle-derived CO2 can be divided into three combination types, which control the content and distribution of CO2. The paper established the three-period pool-forming model of CO2 containing gas pools in Songliao Basin.

关 键 词：二氧化碳 幔源成因 分布规律 运聚成藏机制 成藏模式 松辽盆地 

分 类 号：TE112.3[石油与天然气工程—油气勘探]