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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。
According to the carbon inherited isotope in oil, it has the inheritance of parent material, and uses the stable isotope method to identify the oil fingerprints of crude oil. Long-term weathering simulations of 380 # fuel oil were carried out for n-alkanes. The relative standard deviations (RSDs) of δ13CPr / C19, δ13CPh / C19, δ13CPr / C20 and δ13CPh / Less than 5%, showing some stability, can be used as a diagnostic ratio for fingerprinting. For PAHs, 380 # fuel oil and Kuwait crude oil were subjected to a long-term indoor weathering simulation experiment. The δ13Cflu and δ13Cph of the weathered oil and crude oil were distributed from -27.476 ‰ to -26.583 ‰ and from -26.482 ‰ to -21.914 ‰ respectively, Each focused on a certain range, the use of dual δ13Cflu and δ13Cphe indicators can distinguish between different samples of oil weathering. Studies have shown that stable isotopes as a means of tracking oil sources can be used for identification of oil sources after weathering.