Abstract
Geochemical typification of oils and condensates of the Geophizicheskoye and Soletsko-Khanaveyskoye (Khanaveyskaya area) fields (The Gydan Peninsula, West Siberia) was carried out. According to the obtained geochemical information (carbon isotope composition, molecular parameters of genotype and maturity) and its comparison with published materials on the geochemistry of organic matter, it is shown that hydrocarbon accumulations of these fields were formed due to the oil-and-gas generation in the Jurassic source rock strata. The oil of the Geophizicheskoye field from the Akh Formation is generated by the mature organic matter of the Bazhenov Formation. Other samples of the studied collection from Cretaceous accumulations are characterized by mixed facies-genetic type, i.e. they are formed both due to the mixed organic matter of the Lower – Middle Jurassic oil-and-gas source rock and by mixture of hydrocarbon fluids migrating into traps from various Jurassic oil-and-gas source rocks. Judging by genetic indicators of the С5–C8 hydrocarbons composition, at least the light (gasoline) fraction of the condensate from Middle Jurassic strata of the Geophizicheskoye field was generated predominantly by the terragenic organic matter of the Lower – Middle Jurassic. Low concentrations or absence of n-alkanes and acyclic isoprenanes indicate the development of biodegradation processes of the initial and middle stages in shallow Aptian-Albian-Cenomanian accumulations.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call