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烃类是现代沉积物和古代沉积岩的组成部分,但二者的烃类无论在种类或结构上都有明显的区别。烷烃在现代沉积物中,重质正构烷烃的分布奇数碳原子分子占有明显的优势;而古代沉积岩中重质烷烃的分布奇数碳原子分子优势很小或消失。芳烃组分中的苝是一个典型的有机地球化学指标,Z·艾曾塔特(Aizenshtat 1973)研究了各种沉积环境的现代沉积物和古代岩石后,发现苝的存在很普遍,且不直接来源于现代生物,而是在成岩过程中的色素转
Hydrocarbons are part of modern sediments and ancient sediments, but the hydrocarbons in both are distinctly different in species and structure. Alkanes In modern sediments, the distribution of odd-numbered n-alkanes possesses distinct advantages over odd-numbered carbon atoms; while the distribution of odd-numbered alkanes in ancient sediments has the advantage of small or disappearing molecules. Perylene in aromatic constituents is a typical organic geochemical indicator. After studying the modern sediments and ancient rocks in various depositional environments, Z. Aizenshtat (1973) found perylene to be very common and not directly It comes from modern life but from pigment turning during diagenesis