Abstract
The analysis of thermocracking products of dewaxed heavy petroleum distillates indicates that naphthenic components in the distillates contain numerous n-alkyl and long isoprenoid-type substituents attached to naphthenic cores. These substituents are not characteristic for most multi-ringed biological markers present in ancient sediments. These data suggest that the biological precursors of crude oils underwent extensive skeletal modifications during the petroleum catagenesis stage. The modifications could include the grafting of various long n-alkyl and isoprenoid chains to indigenous naphthenic chemical fossils.
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