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由于原油中氮化物含量低且组成复杂，在用仪器分析其特征之前需要进行浓缩和预分离。采用柱液相色谱对塔里木盆地原油样品中的含氮化合物进行了分离。首先用中性氧化铝将原油分成饱和烃、芳烃和富氮馏份；然后用硅酸将富氮馏份进一步分离，得到中性吡咯氮、胺和碱性吡啶等馏分。用装有氮磷检测器（ＮＰＤ）的气相色谱和色谱－质谱（ＧＣ／ＭＳ）对中性吡咯氮的特征进行了分析。定性了１９个烷基咔唑和烷基苯并咔唑系列；比较了甲基咔唑和二甲基咔唑同分异构体在不同成因和来源的原油样品中的分布，发现其能较好地区分海相及陆相原油。该方法效果好，分析速度快且简便易行，适用于大量样品的分析。
Due to the low nitrogen content and complex composition of the crude oil, it is necessary to concentrate and preseparate before characterizing the instrument. The column liquid chromatography was used to separate the nitrogenous compounds in the crude oil from the Tarim Basin. Firstly, the crude oil is separated into saturated hydrocarbons, aromatic hydrocarbons and nitrogen-enriched fractions by neutral alumina; and the nitrogen-enriched fraction is further separated by silicic acid to obtain neutral pyrrole nitrogen, amine and basic pyridine and other fractions. The characteristics of neutral pyrrole nitrogen were analyzed by gas chromatography and gas chromatography-mass spectrometry (GC / MS) equipped with a nitrogen-phosphorus detector (NPD). 19 alkylcarbazoles and alkylbenzocarbazoles were characterized; the distribution of methylcarbazole and dimethylcarbazole isomers in crude oil samples of different origins and sources was compared and found to be more Good distinction between marine and continental crude oil. The method is effective, fast and easy to analyze, suitable for a large number of sample analysis.