松辽盆地北部深层二氧化碳的成藏疏导通道  

Leading passage of carbon dioxide reservoir in deep layer of North Songliao Basin

作　　者：王佰长[1,2] 谈迎[3] 刘德良[3] 

机构地区：[1]南京大学地球科学系 [2]大庆油田有限责任公司勘探部黑龙江大庆163453 [3]中国科学技术大学地球与空间科学院

出　　处：《石油学报》2005年第2期42-46,共5页Acta Petrolei Sinica

基　　金：国家"九五"科技攻关项目(991100103);国家自然科学基金项目(No.40472074)联合资助。

摘　　要：从二氧化碳气藏疏导通道的角度,对松辽盆地北部徐家围子断陷发现的幔源二氧化碳气藏及无机成因的烷烃气藏进行了探讨。根据松辽盆地深部地质结构、异常高的热流值等特征,认为对松辽盆地深层的壳内低速高导体可以有两种解释:①上地幔发生部分熔融,析离出来的流体相在静压力作用之下上升并穿过莫霍面后,在下地壳上部或中地壳内聚集而成的岩浆房;②在缺水条件下,高热流值作用形成的壳内熔融体。通过对盆地深部地壳发育的拆离带和网状构造特征、二氧化碳的运移疏导特点以及盆地北部昌德东二化碳气藏地球化学特征等的进一步解析表明,松辽盆地深部中上地壳的低速高导体是把地幔流体中的二氧化碳通过壳内火山、岩浆活动运输到中、浅部成藏的中转站。The leading passages of mantle-genetic carbon dioxide reservoir and inorganic alkane hydrocarbon reservoir found in Xujiaweizi Rift of North Songliao Basin were discussed. The tectonic characters of deep layer and high abnormal thermal-flow of Songliao Basin show that the crust low-velocity and high-conduction zone in the deep layer of Songliao Basin may be the magma chamber accumulated in the mid or lower crust and produced from the partly melting inside mantle under the interaction of crust and mantle. The low-velocity and high-conductivity zone may also be the melted lava inside crust under the conditions of high thermal flow and shortage of water. The analysis on geophysical data and geochemical data of deep layer in North Songliao Basin suggests that the low-velocity and high-conduction zone in crust of deep layer in Songliao Basin is a mid-station for transferring mantle-derived carbon dioxide into the shallow reservoir by magmatism and volcanism.

关 键 词：松辽盆地 深层二氧化碳 成藏疏导通道 低速高导体 岩浆房 

分 类 号：TE122.2[石油与天然气工程—油气勘探]