摘要
生物降解原油在我国分布广泛并且在重油资源中占有一定的比例。本文通过采用单体化合物碳同位素分析技术（GC-IRMS）对取自辽河油田西部凹陷的重油以及它们沥青质组分的热解产物进行单体碳同位素测定，来研究原油沥青质热解产物中正构烷烃单体碳同位素的组成及其对研究生物降解油的指示意义。研究结果表明，沥青质热解产物中正构烷烃组分的单体碳同位素组成可用于生物降解较严重的重油样品进行油／油对比，并且与原油中的正构烷烃单体碳同位素组成的对比可用来讨论不同的母质来源以及是否存在后期混入等问题。
Biodegraded crude oils are widely distributed in China and make up a certain portion of the Chinese heavy-oil resources. The purpose of thes study is to investigate carbon isotopic composition of individual compounds in asphaltene pyrolysates and its implication in studying biodegraded oils by determining carbon isotopic composition of them and their asphaltenes pyrolysates. The results indicate that carbon isotopic compositions of individual n-alkanes of crude oils can be used to make oil / oil correlation of non-biodegraded or mildly biodegraded oils, while carbon isotopic compositions of n-alkanes generated by pyrolysis of asphaltenes are suitable for the correlations of moderately and severely biodegraded oils. Furthermore, comparison between the n-alkanes δ13C values in the oils and those in the pyrolysates shows that this is valuable for differentiating different source rock and variable input later.
出处
《地球化学》
CAS
CSCD
北大核心
1998年第6期532-536,共5页
Geochimica
基金
中国科学院院长基金!院基计字351号
