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含氮有机化合物是原油及生油岩中的一种非烃组分。它们大部分以杂环芳烃化合物形式存在。化学性质上,这类化合物主要分成为含吡咯环结构的中性氮系列和含吡啶环结构的碱性氮系列,两者之比约为3:1～4:1。原油中的含氮化合物对环境和炼制工业有不良影响,因而在这些领域对它们的分离和检测较早被人们重视。近年来,随着油藏地球化学的兴起和发展,国外一些学者发现含氮化合物可作为原油二次运移的示踪性指标。国内这方面的研究正在起步。本文报道塔里木不同成因原油中吡咯氮系列化合物含量和烷基咔唑化合物分布的差异性,并探讨其地球化学意义。
Nitrogen-containing organic compounds are a non-hydrocarbon component of crude oil and source rock. Most of them are in the form of heterocyclic aromatic compounds. Chemically, these compounds are mainly divided into a neutral nitrogen series containing pyrrole ring structure and a basic nitrogen series containing pyridine ring structure, the ratio of the two is about 3: 1 ~ 4: 1. Nitrogen compounds in crude oil have adverse effects on the environment and the refining industry, and thus their separation and detection in these fields have been given priority attention. In recent years, with the rise and development of reservoir geochemistry, some foreign scholars have found that nitrogenous compounds can be used as a tracer of secondary migration of crude oil. Domestic research in this area is starting. This paper reports the differences of pyrrole-nitrogen compounds and alkylcarbazole compounds in Tarim oil from different origins and discusses their geochemical implications.