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Journal V.25.No.3.2023
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Composition transformation of terrigenous organic matter resinous-asphaltene components in super-deep wells in Siberia during meso- and apocatagenesis

K.V. Dolzhenko, L.S. Borisova, A.N. Fomin, I.D. Popova

Original article

DOI https://doi.org/10.18599/grs.2023.3.15

119-128
rus.

open access

Under a Creative Commons license

The evolution of the elemental composition of dispersed organic matter (DOM) heterocyclic components during catagenesis was traced via studying samples from the Tyumen (SG-6) and Srednevylyuy-27 (SV-27) super-deep wells of Siberia. During mesocatagenesis, the composition of terrigenous DOM asphaltenes and resins undergoes directed changes: a decrease in hydrogen and oxygen content, enrichment with carbon, and graphitization of the structure. During apocatagenesis, due to high-temperature destruction, on the one hand, there is a condensation of individual blocks of asphaltenes and their transition to an insoluble form (formation of epiasphaltenic kerogens – EPAK). On the other hand, the lighter part of the asphaltenes goes into the formation of hydrocarbons and gas formation – a relative increase in the concentration of the former in % by mass of residual bitumoids is noted, as well as structural redistributions within benzene and spirit-benzene resins. In all studied parameters of the elemental composition, a symmetrical (unidirectional) transformation of resinous and asphaltene components of bitumoids from the SG-6 and SV-27 wells under harsh thermobaric conditions is noted. The obtained results should be taken into account when predicting new oil and gas accumulation zones in deep-laid horizons.

 

asphaltenes, resins, elemental composition, catagenesis, terrigenous organic matter, super-deep wells

 

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Kirill V. Dolzhenko – Cand. Sci. (Geology and Mineralogy), Researcher at the Laboratory of Oil and Gas Geochemistry, Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences
3 Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation
 
Lyubov S. Borisova – Dr. Sci. (Geology and Mineralogy), Leading Researcher at the Laboratory of Oil and Gas Geochemistry, Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Associate Professor of the Department of Petroleum and Gas Field Geology, Geological and Geophysical Faculty, Novosibirsk State University
3 Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation
 
Alexander N. Fomin – Dr. Sci. (Geology and Mineralogy), Chief Researcher at the Laboratory of Oil and Gas Geochemistry, Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Head of the Department of Petroleum and Gas Field Geology, Geological and Geophysical Faculty, Novosibirsk State University, 
3 Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation
 
Irina Dmitrievna Popova – Engineer at the Laboratory of Oil and Gas Geochemistry, Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences; Graduate student at the Department of Petroleum and Gas Field Geology, Geological and Geophysical Faculty, Novosibirsk State University
3 Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation
 

 

For citation:

Dolzhenko K.V., Borisova L.S., Fomin A.N., Popova I.D. (2023). Composition transformation of terrigenous organic matter resinous-asphaltene components in super-deep wells in Siberia during meso- and apocatagenesis. Georesursy = Georesources, 25(3), pp. 119–128. https://doi.org/10.18599/grs.2023.3.15

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