Composition of the soluble organic matter of oil shale of boghead from the Taimylyrskoe deposit

The paper presents the results of studies of soluble organic matter of oil shale from the deposit Taymylyrskoe (age of formation - chalk, depth of the layers 15-20 m). The relevance of the work is the need to obtain information about the matter's chemical nature and to determine its generation potential. A complex of modern physicochemical methods of analysis (extraction, infrared spectroscopy, gas chromatography, and two-dimensional gas chromatography with time-of-flight mass spectrometric detector) enabled establishing the chemical nature of the soluble organic matter of oil shale of boghead from the Taymylyrskoe deposit. Gas chromatography was used to determine the relative concentration of relict hydrocarbons of normal and isoprenoid structure, and the calculated geochemical parameters of organic matter of the oil shale were Pr/Ph = 1.98, Pr/n-C17 = 1.28, Ph/ n-C18= 0.42, Ki = 0.76, CPI = 0.79. It was established that the bitumen studied is a complex mixture of hydrocarbon compounds and heteroorganic compounds, dominated by structures with a high degree of aromaticity. In the composition of the soluble organic matter of oil shale, the present boghead normal and isoprenoid alkanes were 11.3%, mono 19.4%, bi 10.2%, tri-and polyaromatic hydrocarbons 29.5%, steranes 0.4%, cycloalkane 2.9%, and heteroaromatic compounds containing a nitrogen atom (carbazole 0.2 %) and sulphur (benzothiophene 0.4%, dibenzothiophene 0.2% and benzonaftothiophene 9.7%). The results obtained enhance understanding of the composition of organic matter of oil shale and cause us to recommend further research on the technological use of natural raw materials.

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