TY - JOUR

T1 - Composition transformation of terrigenous organic matter resinous-asphaltene components in super-deep wells in Siberia during meso-and apocatagenesis

AU - Dolzhenko, Kirill Vasilyevich

AU - Borisova, Lyubov Sergeevna

AU - Fomin, Alexander Nikolaevich

AU - Popova, Irina Dmitrievna

N1 - The work was carried out with the support of the FNI FWZZ-2022-0011 project.

PY - 2023/9/30

Y1 - 2023/9/30

N2 - 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 (HC) 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.

AB - 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 (HC) 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.

KW - asphaltenes

KW - catagenesis

KW - elemental composition

KW - resins

KW - super-deep wells

KW - terrigenous organic matter

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85173753611&origin=inward&txGid=6745ba05dabdc7d7283dee8f1327b3f1

UR - https://www.mendeley.com/catalogue/249e0958-e92d-3591-8f12-ae2c5de9af9a/

U2 - 10.18599/grs.2023.3.15

DO - 10.18599/grs.2023.3.15

M3 - Article

VL - 25

SP - 119

EP - 128

JO - Георесурсы

JF - Георесурсы

SN - 1608-5043

IS - 3

ER -