Analysis was conducted for the oils from 39 fields of Lena-Tunguska oil-gas bearing province. All ancient oils of the province are enriched with 12C carbon isotope and carry practically identical set of biomarker hydrocarbons. However, by the concentration ratio of some homological series and individual saturated biomarker hydrocarbons, they are divided into several families that allows suggesting the difference in the lipid sets of their biological sources and in posthumous biomolecule transformation settings.