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Characteristics of Carbon Isotopic Composition of N-alkanesduring Hydrocarbon Generation and Expulsion and Its Significance
Author(s): 
Pages: 469-473
Year: Issue:  3
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  生排烃作用残留油排出油正构烷烃GC-IRMS;
Abstract: 通过对生排烃模拟实验产物(残留油和排出油)中正构烷烃单体碳同位素组成的测定,揭示出生排烃过程中正构烷烃碳同位素组成的变化特征.研究表明,生烃初期,液态正构烷烃主要来自干酪根的初次裂解,它们的碳同位素组成不论是在排出油中还是在残留油中,随温度的变化都不明显,呈现较相似的分布特征;在生烃高峰期,早期形成的沥青质和非烃等组分的二次裂解以及高碳数正构烷烃可能存在的裂解,使得正构烷烃单体碳同位素组成明显富集13C,尤其在高碳数部分呈现出较大的差异.另外,实验结果显示排烃作用对液态正烷烃单体碳同位素组成的影响不太显著.
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