塔里木盆地海相烃源岩烷基萘与烷基菲碳同位素特征及其意义
The stable carbon isotopic compositions of Naphthalenes and Phenanthrenes in marine hydrocarbon source rocks from Tarim basin
芳烃是烃源岩抽提物中重要的馏分之一，蕴含有丰富的地质地球化学信息。由于芳环结构的稳定性，因此不易造成芳烃碳同位素的交换分馏，芳烃分子碳同位素能较好的保存原始的组成特征。通过芳烃的精细分离及GC/IR/MS分析能获得准确的芳烃分子碳同位素信息。塔里木盆地海相存在寒武系-下奥陶统、中上奥陶统两套烃源岩，通过芳烃分子同位素的研究发现两套烃源岩存在明显的差异，芳烃各亚系列均表现出寒武系-下奥陶统烃源岩偏重而上奥陶统烃源岩偏轻的特征；同时发现萘系列碳同位素较菲系列要偏重，随甲基个数的增加萘系列和菲系列的碳同位素均有变轻的趋势。塔里木盆地海相原油的油源经过多年的研究依然存在争论，本文旨在通过对烃源岩芳烃碳同位素的系统研究为塔里木盆地海相的油源对比提供新的思路。
石油天然气地质、石油天然气勘探
塔里木盆地海相芳烃烷基萘烷基菲碳同位素
姜连,林俊峰,张敏.塔里木盆地海相烃源岩烷基萘与烷基菲碳同位素特征及其意义[EB/OL].(2013-12-11)[2025-10-26].http://www.paper.edu.cn/releasepaper/content/201312-256.点此复制
Aromatic hydrocarbon is one of the fractions of extract from source rocks, which contain abundant information of geologic and geochemistry. Because of the stable of aromatic ring, carbon isotopic fractionation of aromatic is not easy to occur, stable carbon isotopic compositions of individual aromatic hydrocarbon can preserve its original characteristics. Precise data of compound-specific isotope analysis of the aromatic can be get by GC/IR/MS. The Cambrian-lower Ordovician and the Middle-Upper Ordovician are the two sets of marine hydrocarbon source rocks in Tarim basin; there is obvious difference between the two sets of hydrocarbon source rocks about the stable carbon isotopic compositions of individual aromatic hydrocarbon; δ13C values of Cambrian-lower Ordovician source rocks are positive and δ13C values of Middle-Upper Ordovician are negative. δ13C values of Phenanthrenes are more negative than δ13C values of Naphthalenes, and more negative with the increasing of methyls. After many years research, the source of marine oils in Tarim is still debated. This paper expects to offer a new way to determine the source of marine oils in Tarim basin.
Tarim basinMarineAromatic hydrocarbonNaphthalenesPhenanthrenesStable carbon isotope
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