Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia
Abstract The paper presents a pioneering attempt in the last 35 years, to summarize the accumulated data on geochemistry of water-dissolved gases of oil and gas-bearing deposits in northern and arctic regions of Western Siberia. Water- dissolved gases from all the studied oil/gas fields are characte...
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crioppubl:10.1088/1755-1315/459/4/042024 2024-06-02T08:01:59+00:00 Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia Dultsev, F F Chernykh, A V 2020 http://dx.doi.org/10.1088/1755-1315/459/4/042024 https://iopscience.iop.org/article/10.1088/1755-1315/459/4/042024/pdf https://iopscience.iop.org/article/10.1088/1755-1315/459/4/042024 unknown IOP Publishing http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining IOP Conference Series: Earth and Environmental Science volume 459, issue 4, page 042024 ISSN 1755-1307 1755-1315 journal-article 2020 crioppubl https://doi.org/10.1088/1755-1315/459/4/042024 2024-05-07T14:04:05Z Abstract The paper presents a pioneering attempt in the last 35 years, to summarize the accumulated data on geochemistry of water-dissolved gases of oil and gas-bearing deposits in northern and arctic regions of Western Siberia. Water- dissolved gases from all the studied oil/gas fields are characterized by absolute predominance (up to 75-99 vol.%) of the methane series hydrocarbons in their composition. The identified (after the L.M. Zorkin’s classification) four classes of hydrocarbon type of water-dissolved gases (vol.%) are designated as: dry (ΣHH < 1), lean (ΣHH = 1-3), semi-fat (ΣHH = 3-5) and fat (ΣHH> 5). The total gas saturation of groundwaters ranges from 0.3 to 5.7 L/L with CH 4 concentrations averaging 95.5 vol.% in the Aptian-Albian-Cenomanian to 83.3 vol.% in the Lower-Middle Jurassic complexes. The levels of homologues ΣHH (C 2 H 6 , C 3 H 8 , C 4 H 10 , C 5 H 12 and C 6 H 14 ) tend to increase with depth: from 1.34 vol.% in the Aptian-Albian-Cenomanian to 11.67 vol.% in the Lower-Middle Jurassic complex. The maximum ΣHH concentrations reaching 30 vol.% were found at the Neocomian base in the peripheral waters of oil accumulations. CO 2 levels show an increasing trend with depth, whereas N 2 concentrations tend to decrease. Given the increased depths and more severe temperature conditions, the level of hydrocarbon generation remains high, however hydrocarbon series is characterized by a shift towards liquid components and methane homologues (the main zone of oil/fat gases generation). Therefore, the revealed in the Lower-Middle Jurassic complex highly gas-saturated groundwaters (up to 4.5-5.7 L/L) enriched with methane homologues allow to assess their hydrocarbon prospects as very high. Article in Journal/Newspaper Arctic Siberia IOP Publishing Arctic IOP Conference Series: Earth and Environmental Science 459 042024 |
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description |
Abstract The paper presents a pioneering attempt in the last 35 years, to summarize the accumulated data on geochemistry of water-dissolved gases of oil and gas-bearing deposits in northern and arctic regions of Western Siberia. Water- dissolved gases from all the studied oil/gas fields are characterized by absolute predominance (up to 75-99 vol.%) of the methane series hydrocarbons in their composition. The identified (after the L.M. Zorkin’s classification) four classes of hydrocarbon type of water-dissolved gases (vol.%) are designated as: dry (ΣHH < 1), lean (ΣHH = 1-3), semi-fat (ΣHH = 3-5) and fat (ΣHH> 5). The total gas saturation of groundwaters ranges from 0.3 to 5.7 L/L with CH 4 concentrations averaging 95.5 vol.% in the Aptian-Albian-Cenomanian to 83.3 vol.% in the Lower-Middle Jurassic complexes. The levels of homologues ΣHH (C 2 H 6 , C 3 H 8 , C 4 H 10 , C 5 H 12 and C 6 H 14 ) tend to increase with depth: from 1.34 vol.% in the Aptian-Albian-Cenomanian to 11.67 vol.% in the Lower-Middle Jurassic complex. The maximum ΣHH concentrations reaching 30 vol.% were found at the Neocomian base in the peripheral waters of oil accumulations. CO 2 levels show an increasing trend with depth, whereas N 2 concentrations tend to decrease. Given the increased depths and more severe temperature conditions, the level of hydrocarbon generation remains high, however hydrocarbon series is characterized by a shift towards liquid components and methane homologues (the main zone of oil/fat gases generation). Therefore, the revealed in the Lower-Middle Jurassic complex highly gas-saturated groundwaters (up to 4.5-5.7 L/L) enriched with methane homologues allow to assess their hydrocarbon prospects as very high. |
format |
Article in Journal/Newspaper |
author |
Dultsev, F F Chernykh, A V |
spellingShingle |
Dultsev, F F Chernykh, A V Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
author_facet |
Dultsev, F F Chernykh, A V |
author_sort |
Dultsev, F F |
title |
Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
title_short |
Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
title_full |
Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
title_fullStr |
Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
title_full_unstemmed |
Geochemistry of Water-Dissolved Gases of Oil-and-Gas Bearing Deposits in Northern and Arctic Regions of Western Siberia |
title_sort |
geochemistry of water-dissolved gases of oil-and-gas bearing deposits in northern and arctic regions of western siberia |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1088/1755-1315/459/4/042024 https://iopscience.iop.org/article/10.1088/1755-1315/459/4/042024/pdf https://iopscience.iop.org/article/10.1088/1755-1315/459/4/042024 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
IOP Conference Series: Earth and Environmental Science volume 459, issue 4, page 042024 ISSN 1755-1307 1755-1315 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1755-1315/459/4/042024 |
container_title |
IOP Conference Series: Earth and Environmental Science |
container_volume |
459 |
container_start_page |
042024 |
_version_ |
1800746476245090304 |