前处理方法对原油中金刚烷化合物定量的影响

Effect of pretreatment methods on determination of diamondoids in crude oils

李二庭 向宝力 马万云 熊永强 王明 米巨磊

LI Erting XIANG Baoli MA Wanyun XIONG Yongqiang WANG Ming MI Julei

1. 中国石油 新疆油田分公司 新疆砾岩油藏实验室, 新疆 克拉玛依; 2. 中国石油 新疆油田分公司 实验检测研究院, 新疆 克拉玛依 834000; 3. 中国科学院 广州地球化学研究所 有机地球化学国家重点实验室, 广州 510640

1. Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China; 2. Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China; 3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

利用色谱/质谱/质谱方法分析了准噶尔盆地不同密度原油中金刚烷化合物的含量，探讨了族组分分离法和直接进样法2种前处理方法对金刚烷化合物测定的影响。族组分分离法会造成原油中金刚烷类化合物含量损失，特别是密度相对小的单金刚烷类损失更大，但族组分分离方法有利于低熟原油中低含量、受挥发作用影响较小的双金刚烷类化合物的富集，更有利于仪器检出。族组分分离法对金刚烷异构化指标影响较小，对应用更为重要的浓度指标影响较大，因此在进行金刚烷类化合物分析时应尽量避免复杂的前处理，减少金刚烷类化合物的损失。选择直接进样法是测定正常油、轻质油和凝析油中金刚烷类化合物的最佳前处理方法，对于部分低熟原油样品可考虑使用族组分分离法进行处理。

The content of diamondoids in crude oils of different density from the Junggar Basin was analyzed by gaschromatography-mass spectrometry-mass spectrometry to investigate the effect of group component separation and direct injection on the determination of diamondoids in crude oils. The group component separation method will result in the loss of adamantane from crude oils, especially a large loss of single adamantanes with relatively lower density. However, the group component separation method is conducive to the enrichment of low-mass adamantane compounds in low-maturity crude oils, especially the diadamantane compounds which are less affected by volatilization, and thus more favorable for detection. The group component separation process has little effect on the isomerization index of adamantane, but has a great influence on the concentration index. Therefore, in order to reduce the loss of diamondoids during preparation, complex pretreatment should be avoided as much as possible. The direct injection method is the best pretreatment method for the determination of adamantane compounds in normal oils, light oils and condensates. For some low-maturity crude oil samples, the group component separation method can be considered.

国家科技重大专项（2011ZX05008-002-50）和国家自然科学基金（41372136）资助。

https://doi.org/10.11781/sysydz201906916