摘要 根据石油中的碳稳定同位素具有母质继承效应，利用稳定同位素手段对原油的油指纹进行鉴定。对于正构烷烃指标，在室内对380#燃料油进行了长期风化模拟实验，在长期风化中δ13CPr/C19、δ13CPh/C19、δ13CPr/C20和δ13CPh/C20其相对标准偏差（RSD，relative standard deviation）小于5%，表现出一定的稳定性，可作为诊断比值来进行油指纹鉴别。对于多环芳烃，对380#燃料油和科威特原油进行了室内长期风化模拟实验，燃料油和原油风化样的δ13Cflu和δ13Cph分别分布于-27.476‰~-26.583‰和-26.482‰~-21.914‰，各自集中于一定范围内，利用δ13Cflu和δ13Cphe双指标可区分不同油品的风化样品。研究证明稳定同位素作为一种追踪油源的技术手段，可以用于风化后的油源鉴别。
Abstract：Carbon stable isotopes can be applied to identify the fingerprints of oil spill on the basis that the carbon isotope ratios of the crude oil are generally inherited from their original organic substances. A long-term weathering simulation experiment for the n-alkanes indicators was performed on the 380# fuel oil in the laboratory,δ13CPr/C19,δ13CPh/C19,δ13CPr/C20 and δ13CPh/C20, its relative standard deviation (RSD) less than 5%, which can be used as diagnostic ratios for the oil source fingerprint identification. For the PAHs indicators, there is a indoor long-term weathering simulation experiments for 380# fuel oil and Kuwait crude oil, the δ13Cflu and δ13Cph of the two types of oils were distributed at -27.476‰~-26.583‰ and -26.482‰~-21.914‰, each focusing on a certain range, use of δ13Cflu and δ13Cphe as double indicators can distinguish different samples of weathering oil in the long-term weathering. Studies have shown that stable isotope tracing oil as a source of technical means can be used to identify the source of oil after weathering.
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