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松辽盆地万金塔气藏以产二氧化碳气为主,次为甲烷。其δ～(13)C_((CO)_2)为-4.04‰～-8.83‰,δ～(13)C_1为-42.07‰～-45.70‰,～3He/～4He为6.8×10～(-6)。以此地化特征与松辽盆地其它地区的煤成气、油型气及国内外典型的无机成因气进行对比,并结合地质资料,确认万金塔气藏中的二氧化碳气主要是通过大断裂来自于地幔岩浆,属无机成因;甲烷及其同系物是有机成因的。

Origin of the Natural Gas in Wanjinta Reservoir in Songliao Basin

??Wanjinta reservoir in Songliao Basin mainly produces carbon dioxide, then methone. Its ??¹³C_CO2 is -4.04??~-8.83??, ??¹³C₁ -42.07??~-45.70?? ³He/⁴He 6.8×10^-6. Contrasting these geo-chemical characteristics with the coal gas and oil gas at other places in this Basin as well as the typical ablogenetic gas at home and abroad, and combined with the geological data, it is confirmed that the carbon dioxide in Wangjinta reservoir mainly came from mantle magma through the huge rift, belonging to abiogenetic gas, but the methane and its series are biogenetic gases.