The authors present the materials of Jurassic oil and condensate studies in the Pudinsky Petroleum District, the Vasyugansky Petroleum Area. It is found that physical and chemical properties of hydrocarbon fluids are essentially inhomogeneous both over the area and in the section, which is indicative of a considerable influence of migration processes on their composition. Genetic typification of the investigated collection was conducted on the basis of analytical data geochemical interpretation in accordance with composition of low-molecular hydrocarbons C₃-C₉, n-alkanes, acyclic isoprenanes, steranes, terpanes, and arenes. It is shown that the majority of oils and condensates from the Upper Jurassic accumulations (Nunaksky Formation) have predominantly aquatic genesis, and their source is Organic Matter of the Bazhenov Formation. The studied condensates from Middle Jurassic accumulations (Tyumen Formation, Kazansky, and Ostaninsky areas) are similar to mainly terragenous Organic Matter of the Tyumen Formation in terms of genetic parameters. The mixed genetic type determined for individual samples from the Naunaksky accumulations is indicative of the fact that several sources with different Organic Matter facies and genetic types (Bazhenov, Togursky, and Tyumen formations) were involved in generation of hydrocarbon fluids of Upper Jurassic accumulations. In accordance with basic molecular characteristics of catalytic thermal maturity (n-alkane oddness indices, stereoisometric ratios of С₂₉ steranes, Ts/Tm parameter, phenanthrene and dibenzothiophene composition ratios), the studied oils and condensates were generated in oil window conditions.

Elena A. Fursenko ORCiD  Scopus
Candidate of Geological and Mineralogical Sciences,
Senior Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: FursenkoEA@ipgg.sbras.ru

​Aleksandra I. Burukhina  ORCiD  Scopus
Junior Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: BurukhinaAI@ipgg.sbras.ru

Elena A. Kostyreva Scopus 
Candidate of Geological and Mineralogical Sciences,
Senior Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: KostyrevaEA@ipgg.nsc.ru

Inga S. Sotnich ORCiD  Scopus
Candidate of Geological and Mineralogical Sciences,
Senior Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: SotnichIS@ipgg.sbras.ru

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