ISSN 1608-5078 (Online)
Geochemistry of hydrocarbons of the Terek-Caspian trough
N.Sh. Yandarbiev1, E.V. Kozlova2, N.P. Fadeeva1, O.V. Krylov1, Yu.V. Naumchev1
Within the Terek-Caspian oil and gas bearing basin of the Eastern Ciscaucasia, oil deposits occur in a wide stratigraphic range of rocks of the Mesozoic-Cenozoic section, from the Jurassic, at depths from 5800 to 200 m. In the sedimentary section, carbonate and terrigenous Middle Jurassic, Lower Cretaceous, Oligocene-Lower Miocene and Miocene oil-mother rocks are distinguished. Organic matter from them have different geochemical characteristics and different maturity to realize the generation potential. The article presents the results of a comprehensive study of potential petroleum-bearing rocks and hydrocarbon fluids from the Terek-Sunzha folded zone of the Terek-Caspian Trough, including lithological, chemical-bituminological, pyrolytic, chromatographic and chromatographic-mass spectrometry investigations. A detailed description of hydrocarbon fluids at the molecular level and genetic correlations of oil-oil and oil-organic matter are given. Specific features of the oil deposits of the Mesozoic-Cenozoic section are noted. Among the studied bitumens, the chromatographic characteristics of the extractable organic matter from the Khadum carbonate-clayey deposits and oils from the Cretaceous and Neogene reservoirs are most similar. The composition of a complex natural mixture of hydrocarbons from various sources, with different maturation during the geological history of the region, does not allow making unambiguous conclusions about the source or sources of hydrocarbons for the deposits of the Terek-Caspian Trough.
hydrocarbons, bitumen, source rock, star diagrams.
Dahnova M.V. Application of geochemical research methods for prospecting, exploration and development of hydrocarbon fields. Geologiya nefti i gaza = The geology of oil and gas. 2007. No. 2. Pp. 81-89. (In Russ.)
Chahmahchev A.V. Hydrocarbons-biomarkers as indicators of the geological age of oil. Geohimiya = Geochemistry. 1993. No. 12. Pp. 1806-1813. (In Russ.)
Connon J., Cassou A.M. Properties of gases and petroleum lipids derived from terrestrial kerogen at various maturation levels. Geochim. Cosmochim. Acta. 1980. No. 44. Рp. 1-23.
Grantham P., Warefield I. Variation in the steranes carbon number distributions of marine source rock derived crude oils through geological time. Organ. Geochem. 1988. V.12. Pp. 61.
Petrov Al.A. Biometrics and geochemical conditions for the transformation of Russia’s oils. Geologiya nefti i gaza = The geology of oil and gas. 1994. No. 6. Pp. 13-19. (In Russ.)
Petrov Al.A. Geochemical significance of steranes. Nauchno-prikladnye aspekty geohimii nefti i gaza [Scientific and Applied Aspects of Oil and Gas Geochemistry]. Moscow: IGIRGI. 1991. Pp. 21-30. (In Russ.)
Peters K.E., Moldowan J.M. The biomarker guide. Prentice Hall: Englewood Cliffs. New Jersy. 1993. 353 p.
Soboleva E.V., Guseva A.N. Khmiya goryuchih iskopaemyh [Chemistry of combustible minerals]. Moscow: Moscow State University Publ. 2010. 342 p. (In Russ.)
Waples D.W., Machihara T. Biomarkers for Geologists: a practical guide to the application of steranes and triterpanes in petroleum exploration. Tulsa. AAPG. 1991. 91 p.
1Lomonosov Moscow State University, Moscow, Russia
2Skolkovo Institute of Science and Technology, Moscow, Russia
Yandarbiev N.Sh., Kozlova E.V., Fadeeva N.P., Krylov O.V., Naumchev Yu.V. Geochemistry of hydrocarbons of the Terek-Caspian trough. Georesursy = Georesources. 2017. Special issue. Part 2. Pp. 227-239. DOI: http://doi.org/10.18599/grs.19.22