用正构烷烃分布特征鉴别海上混合原油

发布时间：2018-09-08 09:53

【摘要】：为鉴别海上混合型溢油,对混合原油的正构烷烃分布特征进行探讨,通过混油实验考察混合比对正构烷烃分布以及诊断比值的影响.实验中正构烷烃分布相异最大的大庆原油和沙特原油混合后,n-C_(10)—n-C_(18)的相对含量与大庆原油比例呈线性负相关,而n-C_(18)—n-C_(35)与其呈线性正相关,这种双向分布的特点明显不同于单油的单向分布.正构烷烃分布相近的阿联酋-伊拉克混油中n-C_(10)—n-C_(35)分布与单油几乎相同,但其n-C_(18)/Ph随着混合比而变化,据此可以判别是混油还是单油.混合原油的n-C_(17)/Pr、n-C_(18)/Ph和Pr/Ph取决于单油之间的差异性,相差较大的混合后与混合比呈线性相关.30 d短期风化实验表明,混油中的n-C_(10)—n-C13受风化影响下降明显,而n-C15—n-C_(35)变化不大.混合原油的n-C_(17)/Pr、n-C_(18)/Ph和Pr/Ph基本上不受风化影响,即诊断比值仍可作为鉴别风化混油种类的依据.
[Abstract]:In order to identify mixed oil spill on the sea, the distribution characteristics of normal alkane in mixed crude oil were discussed. The influence of mixing ratio on normal alkane distribution and diagnostic ratio was investigated by mixing experiment. The relative content of n-C _ (10) -n-C _ (18) has a linear negative correlation with the ratio of Daqing crude oil, and the n-C18 -n-C _ (35) has a linear positive correlation with it. The characteristics of this bidirectional distribution are obviously different from the one-way distribution of single oil. The n-C _ (10) -n-C _ (35) distribution of UAE-Iraq mixed oil with similar n-alkane distribution is almost the same as that of single oil, but its n-C18 / Ph varies with mixing ratio. N C _ (17) / Prn _ (18) / Ph and Pr/Ph of mixed crude oil depend on the difference of single oil. The results of short-term weathering experiment show that n-C _ (10) -n-C _ (13) decreases obviously, but n-C15-n-C _ (35) does not change much. The n-C17 / Prn-C18 / Ph and Pr/Ph of mixed crude oil are not affected by weathering, that is, the diagnostic ratio can still be used as the basis for the identification of weathered mixed oil.
【作者单位】：大连海事大学环境科学与工程学院;
【基金】：中央高校基本科研业务费专项资金资助~~
【分类号】：X55;X834

【相似文献】