The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions

•The effect of origin and genetic processes of aromatic hydrocarbons in petroleum.•Oils from the North-West shelf of Australia.•δ13C of the aromatic components show a 13C depletion as methylation increases.•δ13C of the methyl groups display differences between ‘mature’ and ‘immature’ oils.•Isotopic...

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