A comparison of the distributions of carbazoles and dibenzothiophenes in western Qaidam Basin, Northwest China  

作　　者：GUAN Mingming ZHANG Chunming 

机构地区：[1]Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University),Ministry of Education [2]School of Earth Environment and Water Resources, Yangtze University [3]College of Technology & Engineering, Yangtze University

出　　处：《Chinese Journal Of Geochemistry》2014年第2期194-200,共7页中国地球化学学报

基　　金：financially supported by the National Natural Science Foundation of China(Nos.40772091 and 41172136)

摘　　要：Variations in the distributions of carbazoles and dibenzothiophenes were investigated in a set of source rocks, which differ mainly in their maturity levels during immature-mature stages. A comparison of the distributions of carbazoles and dibenzothiophenes has revealed the main results as follows: variations in the relative amounts ①of C0-, C1-, C2-dibenzothiophenes show a low correlation with that of the corresponding carbazoles, with the former's being much higher than the latter's; variations in the relative amounts of methyldibe② nzothiophene isomers also display a low correlation with that of the corresponding methylcarbazoles, with 4-/4- +1-methyldibenzothiophene ratio ranging from 0.52 to 0.96, while the corresponding carbazole ratio of 1-/1- +4-methylcarbazole only being 0.71±0.05; the mat③ urity parameter for 4,6-/4,6- +1,4-dimethyldibenzothiohene, ranging from 0.34 to 0.75, shows a remarkable linear correlation with the corresponding ratio of 1,8-/1,8- +1,4-dimethylcarbazole(R2>0.84). The un-correlation may indicate some different geological-geochemical fates for some isomers of dibenzothiophenes and carbazoles. The high correlation may reveal a strong maturation dependence on the dimethylcarbazole distributions, indicating that attention should be paid when 1,8-/1,8- +1,4-dimethylcarbazole is used as a petroleum migration indicator.Variations in the distributions of carbazoles and dibenzothiophenes were investigated in a set of source rocks, which differ mainly in their maturity levels during immature-mature stages. A comparison of the distributions of carbazoles and dibenzothiophenes has revealed the main results as follows- ① variations in the relative amounts of C0-, C1-, C2-dibenzothiophenes show a low correlation with that of the corresponding carbazoles, with the for- mer＇s being much higher than the latter＇s; ② variations in the relative amounts of methyldibenzothiophene isomers also display a low correlation with that of the corresponding methylcarbazoles, with 4-/4- ＋1-methyldibenzothio- phene ratio ranging from 0.52 to 0.96, while the corresponding carbazole ratio of 1-/1- ＋4-methylcarbazole only being 0.71-0.05; ③ the maturity parameter for 4,6-/4,6- ＋l,4-dimethyldibenzothiohene, ranging from 0.34 to 0.75, shows a remarkable linear correlation with the corresponding ratio of 1,8-/1,8- ＋1,4-dimethylcarbazole （R2〉0.84）. The un-correlation may indicate some different geological-geochemical fates for some isomers of dibenzothiophenes and carbazoles. The high correlation may reveal a strong maturation dependence on the dimethylcarbazole distribu- tions, indicating that attention should be paid when 1,8-/1,8- ＋1,4-dimethylcarbazole is used as a petroleum migra- tion indicator.

关 键 词：二苯并噻吩 中国西北地区 柴达木盆地 咔唑 西部地区 成熟度参数 比值范围 线性相关性 

分 类 号：P618.13[天文地球—矿床学]