Abstract
The aromatic fractions in eleven samples from Tertiary source rocks from a well in the Qaidam Basin were analysed by GC-MS and ninety compounds were identified. These compounds are mainly naphthalene series, phenanthrene series and dibenzothiophene series, but chrysene, pyrene, fluorene, dibenzofuran, biphenyl, fluoranthene, benzonaphthothiophene, benzopyrene, benzofluoranthene and retene are also commonly found Some compounds change as regularly as the burial depth changes from 2800 to 4400 m, and these data can be used to determine the maturity level. The existence of retene may suggest a terrestrial plant input and the high content of dibenzothiophene can be related to a hypersaline environment.
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