CHEMICAL TYPIFICATION AND GENETIC CRITERIA FOR THE COMPOSITION OF GEORGIAN PETROLEUM

Natela Khetsuriani; Vladimer Tsitsishvili; Elza Topuria; Madlena Chkhaidze; Irina Mchedlishvili

doi:10.31435/rsglobal_ws/31052020/7074

Natela Khetsuriani Doctor, Head of the Laboratory of Petroleum Chemistry, chief research worker, Tbilisi State University, Petre Melikishvili Institute of Physical and Organic Chemistry, Tbilisi, Georgia
Vladimer Tsitsishvili Academician, Professor, chief research worker, Tbilisi State University, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry, Tbilisi, Georgia
Elza Topuria PhD, chief research worker, Tbilisi State University, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry, Tbilisi, Georgia
Madlena Chkhaidze MS, scientific worker; Tbilisi State University, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry, Tbilisi, Georgia
Irina Mchedlishvili MS, scientific worker, Tbilisi State University, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry, Tbilisi, Georgia

DOI: https://doi.org/10.31435/rsglobal_ws/31052020/7074

Keywords: crude oil, biomarkers, geochemical criteria, catagenesis, GC/МS

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.

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