石油烃中烷基萘的形成机理及其地球化学意义

Formation Mechanism of Alkylated Naphthalene in Petroleum Hydrocarbon and Its Geochemistry Significance

烷基萘是原油中的重要组成部分,在指示成岩演化环境和成熟度变化方面非常有效。原油中含α,β位取代基的烷基萘异构体含量变化趋势相反,此即为烷基萘成熟度参数提出的依据。着重综述了石油烃中甲基萘两种主要生成途径——分子异构化反应和甲基化、去甲基化反应及其反应机理,以及烷基萘参数的应用概况,阐述了生物降解作用、水洗作用、内源混合作用和有机质来源及其他因素对烷基萘参数的影响,探讨了烷基萘参数应用过程中存在的问题与不足,并展望了今后的发展趋势。

Alkylated naphthalenes is the important component of crude oil, and hence, is very effective in denoting the environment of diagenesis and the variation of maturity. The paper summarized that the metbylated naphthalenes in petroleum hydrocarbon are produced mainly in two ways： the molecule isomerization and the methylation or demethylation, and introduced its reaction mechanism together with the application of the alkylated naphthalenes parameters. It also introduced the biodegradation, water-washing, in-reservoir mixing, the source of organic matter and other factors which can influence the indication to maturity of methylated naphthalenes. With discussion of the separation problem of alkylated naphthalenes parameters in application, it pointed out that the isotope study of alkylated naphthalenes will be the focus in the future.