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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13 C ,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
Based on the determination of carbon isotope composition of n-alkane monomer in the model experiment of hydrocarbon expulsion and expulsion (residual oil and effluent oil), the carbon isotopic compositions of n-alkanes in the process of hydrocarbon generation and expulsion are revealed. The results show that during the initial hydrocarbon generation, the liquid n-alkanes mainly come from the primary cracking of kerogen, and their carbon isotope composition is not obvious with the change of temperature, either in the discharged oil or in the residual oil, showing similar distribution characteristics ; During the peak period of hydrocarbon generation, the early cracking of asphaltene and non-hydrocarbon components and the possible cleavage of high-carbon n-alkanes make the carbon isotope composition of n-alkanes significantly enriched in 13 C, especially In the high carbon part shows a big difference. In addition, the experimental results show that the effect of hydrocarbon expulsion on the carbon isotope composition of liquid n-alkane monomer is not significant