塔里木盆地原油轻烃单体烃碳同位素组成特征

发布时间：2018-08-23 12:51

【摘要】：为探讨塔里木盆地原油类型和油源问题,运用色谱-同位素质谱分析技术,分析了该盆地塔中、塔北、塔东与库车地区的典型原油轻烃单体烃碳同位素组成。结果表明,不同结构轻烃化合物中,支链烷烃与环己烷系列比环戊烷系列更具明显的成因判识意义。2-甲基环戊烷2 mC_5、3-甲基环戊烷3 mC_5、3-甲基环己烷3 mC_6、环己烷CYC6与甲基环己烷mCYC_6等化合物的δ~(13)C在煤成油最高,δ~(13)C大于-21‰;湖相油次之,δ~(13)C位于-25‰~-22‰之间;再次之为寒武系-下奥陶统海相原油,δ~(13)C位于-27‰~-21‰之间,最轻的为上奥陶统海相原油,δ~(13)C小于-28‰。其碳同位素值可以较好的判别该盆地寒武系-下奥陶统海相油、上奥陶统海相油、湖相油与煤成油。优选的8个特征化合物碳同位素可以作为原油成因类型的划分标志,尤其是2-甲基环戊烷2 mC_5、3-甲基环戊烷3 mC_5、3-甲基环己烷3 mC_6、环己烷CYC6与甲基环己烷mCYC_6等化合物。特征轻烃化合物的碳同位素组成可成为不同成因原油的划分标志。
[Abstract]:In order to discuss the types and sources of crude oil in Tarim Basin, the hydrocarbon carbon isotopic compositions of typical light hydrocarbon monomers in Tarim Basin, Tarim Basin, Tarim Basin, Tarim Basin and Kuqa area were analyzed by means of chromatography-isotope mass spectrometry. The results show that, in the light hydrocarbon compounds with different structures, Branch-chain alkanes and cyclohexane series have more significant genetic significance than cyclopentane series. The 未 ~ (13) C of 2-methylcyclopentane 2 mC5H, 3-methylcyclopentane 3mC5C, 3-methylcyclohexane 3mC6, cyclohexane CYC6, methylcyclohexane mCYC_6 and other compounds are found in coal-derived oil. The highest 未 ~ (13) C > -21 鈥，

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