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利用限定体系下的黄金管热解技术,研究了轮南地区原油沥青质生烃过程中气态烃的分子组成和分子碳同位素的变化特征结果表明,轮南地区原油沥青质具有较高的生成甲烷的潜力,生烃过程中气态烃成分和碳同位素的变化规律与干酪根初次裂解气以及原油二次裂解气有所差异根据原油储层的古地温史对沥青质生成甲烷的动力学计算结果表明,沥青质生成的甲烷具有碳同位素较轻的特征,与已报道的轮南地区天然气甲烷偏重的碳同位素组成不符.轮南地区天然气可能主要来自烃源岩干酪根高温裂解的贡献.
The characteristics of molecular composition and molecular carbon isotope variation of gaseous hydrocarbons during the process of hydrocarbon asphaltene formation in Lunnan area were studied by means of the gold tube pyrolysis technique in a limited system. The results show that the crude asphaltenes in Lunnan area have higher methane production The variation of gaseous hydrocarbon components and carbon isotopes during hydrocarbon generation is different from the initial pyrolysis gas of kerogen and the secondary pyrolysis gas of crude oil. According to the paleoearthographic history of crude oil reservoir, the kinetics of formation of methane by asphaltene is shown , Asphaltene methane has the characteristics of lighter carbon isotope, which is not consistent with the reported carbon isotope composition of natural gas methane in Lunnan area.The natural gas in Lunnan area may be mainly contributed by pyrolysis of kerogen from source rocks.