«Proceedings of Gubkin University»

Hydrocarbon biomarkers in thermolysis products of naphtenic soap acids of Anastasievsko-Troitskoe oil-field (IV horizon)

UDC: 579.22:579.66:547.912
DOI: 10.33285/2073-9028-2022-2(307)-46-58

Authors:

¹ Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russian Federation

Keywords: gas chromatography mass-spectrometry, petroleum acids, hydrocarbon biomarkers, sterane, terpane, isoprenane

Annotation:

It has been shown that thermolysis of acids of soap-oil extracted from poorly transformed oil of Anastasievsko-Troitskoe field produces the same saturated biomarker hydrocarbons as those contained in the original oil. It was found that only n-alkanes and isoprenanes are formed in thermolysates of acids desorbed from silica gel with benzene, while both aliphatic and alicyclic biomarker hydrocarbons (steranes and terpanes) are generated from more polar acids – desorbed from silica gel with an alcohol-benzene mixture. There is some difference in the distribution of biomarker hydrocarbons between oil and acid thermolysis products. Unlike oil, in thermolysates n-alkanes prevail over isoprenanes. At the same time the values of the genetic index pristane/phytane are close in the products of thermolysis of acids and in oil, besides, as in all oils, there are no regular isoprenanes of C12 and C17 composition. Maturity values for steranes and terpanes are close and also indicate a low degree of maturity of organic matter.

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