Adamantans in the oils as the indexes of presence of oil source rocks in deep depths (Absheron archipelago, South Caspian depression)

Abstract

The distribution features of adamantans of С10-С14 composition and their role in petroleum genesis has been studied, the biomarkers, adamantine and its homologs identified in Absheron archipelago oils via the method of chromate-mass-spectrometry. The calculations by the chromato-mass-spectrometry data justified that the adamantine and its methyl-substituted compounds are located in the order of increase of their thermo-dynamic steadiness in the following way: 2-Mad > 1-Mad > 3-Mad > Ad, which, in its turn, justifies the genesis of adamantine in the oils via thermic transition of normal alkanes. A complex interpretation of geological-geochemical data allows to make conclusions on a probable bedding of oil sources rocks in deep depths (approximately 13 km or deeper) of South Caspian depression.