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Comparison has been made of the occurrences of aromatic series in the chloroformfractions between immaturr and mature sedimentary rocks from Well Han-2 in the QaidamBasin.According to the general formula C_nH_(2n-p)(p=6,8,10,....,90),the molecular iondistributions of 11 series have been studies by capillary gas chromatography and GC-MS.It is found that the evolution of aromatic homologues from immature to mature obeys thethermodynamic rule and can be summarized as:(1)The alkyl side chains decrease andbecome shorter in the compounds of each series;(2)Alkyl and cycloalkane aromatics(1—3 rings)increase,but cycloalkane aromatics with more(4—5)rings decrease;(3)Aro-matization is observed in alkyl benzene,alkyl naphthalene and alkyl phenanthrene series;and(4)The bimodal distribution of carbon number curves changes into unhnodal distri-bution.It seems that the variation in aromatic homologue distribution can be used as an ef-fective indicator of maturation or as fingerprints for oil/source-rock correlation.
Comparison has been made of the occurrences of aromatic series in the chloroformfractions between immaturr and mature sedimentary rocks from Well Han-2 in the Qaidam Basins. According to the general formula C_nH_ (2n-p) (p = 6,8,10, .. .., 90), the molecular ion distributions of 11 series have been studied by capillary gas chromatography and GC-MS. It is found that the evolution of aromatic homologues from immature to mature obeys thethermodynamic rule and can be summarized as: (1) The (2) Alkyl and cycloalkane aromatics (1-3 rings) increase, but cycloalkane aromatics with more (4-5) rings decrease; (3) Aro-matization is observed in alkyl benzene, alkyl naphthalene and alkyl phenanthrene series; and (4) The bimodal distribution of carbon number curves changes into unhnodal distri-bution. It seems that the variation in aromatic homolog distribution can be used as an ef-fective indicator of maturation or as fingerprints for oil / sourc e-rock correlation.