【摘要】：氮是原油的重要組成元素,主要賦存在非烴和瀝青質(zhì)中,依據(jù)其極性差異分為堿性與非堿性2種類型。相較于其他組成元素,原油氮同位素的研究非常有限,不同極性含氮組分的氮同位素特征研究更是缺乏。本次研究應(yīng)用杜馬斯燃燒法原理,利用EA-IRMS連用技術(shù)測定了江漢油田6個原油樣品不同極性含氮化合物的δ~(15)N和δ~(13)C。結(jié)果表明,不同極性含氮化合物的氮同位素組成具有明顯的差異,堿性氮的δ~(15)N為9.7‰~11.8‰,明顯輕于非堿性氮(11.4‰~14.5‰),原因可能是2種含氮組分的形成機制不同,堿性氮形成于成巖作用早期,δ~(15)值主要受原始母質(zhì)的影響,而非堿性氮在熱演化過程中的富集,氮同位素值更重,利用氮同位素有益于進一步明確原油中含氮化合物的演化機制及其地球化學意義。
[Abstract]:Nitrogen is an important component of crude oil, which mainly exists in non-hydrocarbon and asphaltene. According to its polarity difference, it can be divided into two types: alkaline and non-alkaline. Compared with other elements, the study of nitrogen isotopes in crude oil is very limited, and the nitrogen isotopic characteristics of nitrogen components with different polarity are even less studied. In this study, the Dumas combustion principle was applied to the determination of 未 ~ (15) N and 未 ~ (13) C in 6 crude oil samples from Jianghan Oilfield by EA-IRMS technique. The results show that the nitrogen isotopic compositions of nitrogen compounds with different polarity are obviously different. The 未 ~ (15) N of basic nitrogen is 9.7 鈥，

本文編號：2272569