摘要
Crude oils from different basins in China, Anstralia and New Zealand were analyzed to character-ize aromatic hydrocarbons produced in different environments by means of GC/MS.The distributions of some conunon compounds such as naphthalene, phenanthrene, chrysene, pyrene, fluoranthene,fluorene, dibenzothiophene and dibenzofuran were found to be related to sedimentary environments.Especially the relative contents of fluorenes, dibenzofurans and dibenzothiophenes can be used to di-vide the oils into three types: (1) saline or marine carbonate environment; (2) fresh -brackish water lake; (3 ) swamp and coal-bearing sequence.Aromahc biomarkers (e.g. retene, nor-abietene, derivatives of lupeol and β-amyrin) represent higher plant inputs with respect to the precursors of crude oils. High contents of sulphur-containing compounds like benzothiophene and dibenzothiophene series indicate a reducing sulphur-abundant diagenehc condition. The benzohopane series (C32-C35) was identified both in hypersaline and coal-bearing basins, and it is postulated to be the result of strong bacteria achvity. In all the sam-ples, a complete series of alkyl benzenes was analyzed. The similarity of its carbon-number distribu-tion with that of n-alkanes probably suggests their genetic relationship.The distribution of the methylphenanthrene series reflects the evolution degree of crude oils, MPI holding a positive correlation with C29 -sterane 20S/(20S+ 20R).
Crude oils from different basins in China, Anstralia and New Zealand were analyzed to character-ize aromatic hydrocarbons produced in different environments by means of GC/MS.The distributions of some conunon compounds such as naphthalene, phenanthrene, chrysene, pyrene, fluoranthene,fluorene, dibenzothiophene and dibenzofuran were found to be related to sedimentary environments.Especially the relative contents of fluorenes, dibenzofurans and dibenzothiophenes can be used to di-vide the oils into three types: (1) saline or marine carbonate environment; (2) fresh -brackish water lake; (3 ) swamp and coal-bearing sequence.Aromahc biomarkers (e.g. retene, nor-abietene, derivatives of lupeol and β-amyrin) represent higher plant inputs with respect to the precursors of crude oils. High contents of sulphur-containing compounds like benzothiophene and dibenzothiophene series indicate a reducing sulphur-abundant diagenehc condition. The benzohopane series (C32-C35) was identified both in hypersaline and coal-bearing basins, and it is postulated to be the result of strong bacteria achvity. In all the sam-ples, a complete series of alkyl benzenes was analyzed. The similarity of its carbon-number distribu-tion with that of n-alkanes probably suggests their genetic relationship.The distribution of the methylphenanthrene series reflects the evolution degree of crude oils, MPI holding a positive correlation with C29 -sterane 20S/(20S+ 20R).
关键词
成矿环境
碳氢化合物
原油
有机质
成熟度
aromatic compound, depositional environment, precursor input
hypersaline basin, MPI
