Abstract
The results of investigation of molecular composition of biological markers of Eastern Georgia crude oils by methods of GLC, MS, GC/MS, genetic and geochemical aspects of their chemical composition, the main geochemical criteria for making various genetic correlations are presented. It was established that though these crude oils belong to different chemical types they all belong to a single genetic type. High concentrations of isoprenoid alkanes, ratio iC19/iC20 > 1, were revealed. In fractions higher than 420°С amongst the main biomarkers — steranes and triterpanes (C27–C33) – prevail hopanes of the 17αH-hopan series (C30H52); steranes (C27–C29) are represented by α-sterans and iso-sterans. Based on the main geochemical criteria the degree of catagenesis of oils and the probability of biodegradation of some of them was determined. In some crude oils polymethylsubstituted decalines, the relict type hydrocarbons (C14-C16) have been identified.
Highlights
Organic geochemistry is a scientific direction in chemistry of natural biological compounds, the main task of which is study of composition and chemical evolution of organic molecules in sedimentary rocks [1]
It was established that despite the differences in chemical composition the studied oils were genetically similar by ratios iC19/iC20, Σhopanes/Σsteranes, as well as by “naphthenic passport”
Polymethylsubstituted decalines, a relict type hydrocarbons the so-called sesquiterpane hydrocarbons of C14-C16 composition have been identified in the middle fractions of Taribani, Satskhenisi, Norio and Teleti oils
Summary
Organic geochemistry is a scientific direction in chemistry of natural biological compounds, the main task of which is study of composition and chemical evolution of organic molecules in sedimentary rocks [1]. Based on the study of relative distribution of the main relict hydrocarbons — normal C12-C32 and isoprenoid C14-C22 alkanes in middle fractions boiling away at a temperature of 200–420° C, “the chemical typification” of oils was carried out on highly efficient capillary columns according to the method of prof. Crude oil, Bedding, the (kg/ m3) asphaltenes, well No. By the method of mass spectrometry for the hydrocarbons in the paraffin-cycloparaffin part of all studied oils, the structural group composition of the middle (200-420°С) fractions – the relative distribution of alkanes and mono-, bi-, tri-, tetra- and pentacyclic naphthenic hydrocarbons, inherited by oils from the original organic matter, was determined.
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