Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia)
The results of the studies of geochemical and zoning features of water-dissolved gases in the Mesozoic sediments of the junction between the Yenisei-Khatanga and the West Siberian basins are reported. The stage of industrial oil and gas content is more than 3 km thick and involves the depth range fr...
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2021
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ftdoajarticles:oai:doaj.org/article:fc25365602fd42c0842b05ff2bb45bb6 2023-05-15T15:03:46+02:00 Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) Dmitry A. Novikov Evgeny V. Borisov 2021-11-01T00:00:00Z https://doi.org/10.18599/grs.2021.4.1 https://doaj.org/article/fc25365602fd42c0842b05ff2bb45bb6 EN RU eng rus Georesursy Ltd. https://geors.ru/archive/article/1122/ https://doaj.org/toc/1608-5043 https://doaj.org/toc/1608-5078 doi:10.18599/grs.2021.4.1 1608-5043 1608-5078 https://doaj.org/article/fc25365602fd42c0842b05ff2bb45bb6 Georesursy, Vol 23, Iss 4, Pp 2-11 (2021) water-dissolved gases methane homologues gas saturation of groundwaters gas zoning the yenisei-khatanga basin west siberia the arctic Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.18599/grs.2021.4.1 2022-12-31T10:44:34Z The results of the studies of geochemical and zoning features of water-dissolved gases in the Mesozoic sediments of the junction between the Yenisei-Khatanga and the West Siberian basins are reported. The stage of industrial oil and gas content is more than 3 km thick and involves the depth range from 750 to 4000 m. Waters occurring in the region contain methane, their total gas saturation is 0.3 to 4.6 dm3/dm3, and CH4 content in 88.9 to 95.4 vol. % on average. An increase in the concentrations of carbon dioxide and methane homologues is observed with an increase in the depth, which is accompanied by a regular decrease in the concentrations of methane and nitrogen. In general, water-dissolved gases from the Neocomian and Jurassic reservoirs have similar compositions (С1 > N2 > C2 > C3 > n-C4 > i-C4 > CO2 > i-C5 > n-C5). The water-dissolved gases of the Aptian-Albian-Cenomanian sediments are distinguished by lower concentrations of methane homologues (С1 > N2 > C2 > CO2 > C3 > i-C4 > n-C4 > i-C5 > n-C5), with the total content of heavy hydrocarbons (HHC) equal to 1.44 vol. %. Vertical zoning of the composition of water-dissolved gases is determined by the distribution of hydrocarbon pools in the Jurassic-Cretaceous section. A regular increase in the average values of the factor of enrichment with hydrocarbons (HC) (from 37 to 154) was established, along with a decrease in the ratio of CH4/ƩHHC (from 130 to 7), C2H6/C3H8 (from 41 to 2) and i-C4H10/n-C4H10 (from 2.6 to 0.6) from the Aptian-Albian-Cenomanian reservoirs to the Jurassic ones. The zone with anomalous He concentrations within the range of 0.4–0.9 vol. % was detected in the Neocomian and Middle Jurassic sediments. This zone is localized at the north-western slope of the Messoyakh inclined ridge (the Anomalnaya, Turkovskaya, Pelyatkinskaya and Sredne-Yarovskaya areas). The nature of this anomaly needs further studies. Article in Journal/Newspaper Arctic khatanga Siberia Directory of Open Access Journals: DOAJ Articles Arctic Georesursy 23 4 2 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Russian |
topic |
water-dissolved gases methane homologues gas saturation of groundwaters gas zoning the yenisei-khatanga basin west siberia the arctic Geology QE1-996.5 |
spellingShingle |
water-dissolved gases methane homologues gas saturation of groundwaters gas zoning the yenisei-khatanga basin west siberia the arctic Geology QE1-996.5 Dmitry A. Novikov Evgeny V. Borisov Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
topic_facet |
water-dissolved gases methane homologues gas saturation of groundwaters gas zoning the yenisei-khatanga basin west siberia the arctic Geology QE1-996.5 |
description |
The results of the studies of geochemical and zoning features of water-dissolved gases in the Mesozoic sediments of the junction between the Yenisei-Khatanga and the West Siberian basins are reported. The stage of industrial oil and gas content is more than 3 km thick and involves the depth range from 750 to 4000 m. Waters occurring in the region contain methane, their total gas saturation is 0.3 to 4.6 dm3/dm3, and CH4 content in 88.9 to 95.4 vol. % on average. An increase in the concentrations of carbon dioxide and methane homologues is observed with an increase in the depth, which is accompanied by a regular decrease in the concentrations of methane and nitrogen. In general, water-dissolved gases from the Neocomian and Jurassic reservoirs have similar compositions (С1 > N2 > C2 > C3 > n-C4 > i-C4 > CO2 > i-C5 > n-C5). The water-dissolved gases of the Aptian-Albian-Cenomanian sediments are distinguished by lower concentrations of methane homologues (С1 > N2 > C2 > CO2 > C3 > i-C4 > n-C4 > i-C5 > n-C5), with the total content of heavy hydrocarbons (HHC) equal to 1.44 vol. %. Vertical zoning of the composition of water-dissolved gases is determined by the distribution of hydrocarbon pools in the Jurassic-Cretaceous section. A regular increase in the average values of the factor of enrichment with hydrocarbons (HC) (from 37 to 154) was established, along with a decrease in the ratio of CH4/ƩHHC (from 130 to 7), C2H6/C3H8 (from 41 to 2) and i-C4H10/n-C4H10 (from 2.6 to 0.6) from the Aptian-Albian-Cenomanian reservoirs to the Jurassic ones. The zone with anomalous He concentrations within the range of 0.4–0.9 vol. % was detected in the Neocomian and Middle Jurassic sediments. This zone is localized at the north-western slope of the Messoyakh inclined ridge (the Anomalnaya, Turkovskaya, Pelyatkinskaya and Sredne-Yarovskaya areas). The nature of this anomaly needs further studies. |
format |
Article in Journal/Newspaper |
author |
Dmitry A. Novikov Evgeny V. Borisov |
author_facet |
Dmitry A. Novikov Evgeny V. Borisov |
author_sort |
Dmitry A. Novikov |
title |
Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
title_short |
Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
title_full |
Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
title_fullStr |
Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
title_full_unstemmed |
Geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the Yenisei-Khatanga and the West Siberian basins (the Arctic regions of Siberia) |
title_sort |
geochemistry of water-soluble gases in the oil and gas bearing sediments of the zone of junction between the yenisei-khatanga and the west siberian basins (the arctic regions of siberia) |
publisher |
Georesursy Ltd. |
publishDate |
2021 |
url |
https://doi.org/10.18599/grs.2021.4.1 https://doaj.org/article/fc25365602fd42c0842b05ff2bb45bb6 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic khatanga Siberia |
genre_facet |
Arctic khatanga Siberia |
op_source |
Georesursy, Vol 23, Iss 4, Pp 2-11 (2021) |
op_relation |
https://geors.ru/archive/article/1122/ https://doaj.org/toc/1608-5043 https://doaj.org/toc/1608-5078 doi:10.18599/grs.2021.4.1 1608-5043 1608-5078 https://doaj.org/article/fc25365602fd42c0842b05ff2bb45bb6 |
op_doi |
https://doi.org/10.18599/grs.2021.4.1 |
container_title |
Georesursy |
container_volume |
23 |
container_issue |
4 |
container_start_page |
2 |
op_container_end_page |
11 |
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1766335619811770368 |