Abstract: Four carbon dioxide reservoirs have been discovered in Songliao Basin.Some inorganic hydrocarbon gas was captured in Xujiaweizi area,and helium abnormity was found in several places in the north of Songliao Basin.Helium mainly came from mantle,which indicates that mantle-resource gas exists commonly in the researched area.The formation conditions of gas reservoir and crust-mantle structure in the deep strata show that there are several types of inorganic gas resources in Songliao Basin.The outgas types and amount of different gas resource varied with the different geological conditions and evolution processes.There are four outgas models including the model in which inorganic gas directly overflows from mantle matter through lithospheric fracture,the model of heat flow piercement outgas,the model of volcano-magma outgas,and the model of carbonate rock outgas due to heat metamorphism.The heat flow piercement,magma house in crust and volcanic rock overlap in space.The distribution of inorganic carbon dioxide reservoirs relates to above three gas resources.The outgas models of the heat flow piercement and volcano-magma are the main models of gas resources in Songliao Basin.

Key words: Songliao Basin, inorganic gas, gas resources, heat flow piercement, magma house in crust, volcanic rock, outgas model

摘要： 松辽盆地发现了万金塔、乾安、孤店和昌德东4个二氧化碳气藏,并在徐家围子地区发现了无机烃气的踪迹,同时在盆地北部发现多处氦气异常,主要为幔源成因,证实了幔源气体在该区存在的普遍性.对气藏成藏条件和深部壳幔结构的研究表明,松辽盆地存在多种类型无机"气源",由于赋存的地质条件和演化过程不同,不同气源脱气的方式、脱出气体的类型、脱气量也大不相同,共有4种主要的模式:地幔物质沿超岩石圈断裂直接脱气模式;热流底辟体脱气模式;火山—岩浆成因模式;碳酸盐岩热变质成因模式.松辽盆地热流底辟体、壳内岩浆房和火山岩在空间上叠置,且已发现的无机二氧化碳气富集区与这三者密切相关,表明热流底辟体脱气模式和火山—岩浆成因模式是无机成因气主要的"气源"模式.

关键词: 松辽盆地, 无机成因气, 气源, 热流底辟体, 壳内岩浆房, 火山岩, 脱气模式