Выпуск: 2 , Том: 29 , Год издания: 2021

The data on the special aspects of the composition of oils located in four areas of the Nenets Autonomous District on the coast of the Barents Sea are presented. Normal and isoprenoid alkanes, naphthalenes, phenanthrenes, fluorenes, biphenyls, sesquiterpanes, steranes, hopanes, dibenzothiophenes, dibenzofurans, retene, and cadalene are identified among petroleum hydrocarbons by means of gas chromatography-mass spectrometry. The concentrations of metalloporphyrins and perylene were determined spectrophotometrically. It is demonstrated that cyclohexane content is much higher than the fraction of acyclic compounds only in oil from the Toboyskoye oil field. The composition of this oil is also characterized by the maximal content of bicyclic terpanes (nordrimans, drimans, and homodrimans). For oils from the Perevoznoye and Toraveyskoye oil fields, the co-presence of vanadyl- and nickel-porphyrins suggests marine conditions of the accumulation of initial organic matter in the absence of bottom water contamination with hydrogen sulphide. Dibenzofurans were identified only in oil from the Toraveyskoye oil field, while the presence of dibenzothiophenes is observed in all the studied oil samples.