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因受分析测试方法和分析仪器灵敏度限制,前人对天然气中碳同位素研究主要为C_(1～4)气态分子,而C_(5～8)系列碳同位素研究则处于起步阶段。本项研究通过MAT-252同位素质谱计,将天然气样品经色谱分离、脉冲加热燃烧和质谱测定,获得了天然气中C_1-C_7正构烷烃系列碳同位素组成以及C_4以上部分异构体碳同位素组成,并以济阳坳陷桩西-五号桩-孤东地区天然气为例,探讨了天然气中碳同位素分馏机理。
Due to the limitations of analytical testing methods and analytical instrument sensitivity, the carbon isotopes of natural gas are mainly C 1 ~ (4) gaseous molecules, while the carbon isotopes of C 5 ~ 8 series are in their infancy. In this study, the carbon isotope compositions of C 1 -C 7 n-alkanes in natural gas and the carbon isotopic compositions of some isomers of C 4 were obtained from the natural gas samples by means of chromatographic separation, pulsed heating combustion and mass spectrometry through the MAT-252 isotope mass spectrometer. Taking the natural gas in Puxi-Wu-Li-Gudong area of Jiyang Depression as an example, the carbon isotope fractionation mechanism in natural gas is discussed.