Abstract

The participation of the Geobacillus jurassicus DS1T bacteria, isolated from the Dagang oilfield (PRC), in the formation of hydrocarbons of the Dagang oil has been shown. Saturated hydrocarbon biomarkers (n-alkanes, isoprenanes, steranes, and terpanes) have been identified by capillary gas-liquid chromatography and gas chromatography–mass spectrometry in the soluble part and products of thermolysis of the insoluble part (kerogen) of the Geobacillus jurassicus bacteria biomass, with the distribution of biomarkers corresponding to weakly transformed marine organic matter and being close to that in the initial oil. Squalene has been found in all samples, including the source oil.

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