Modelling of the gas hydrate potential in Svalbard's fjords
Large amounts of methane are trapped as natural gas hydrate (NGH) in the sediments of the Arctic. Unlike NGH provinces offshore west of Svalbard (Vestnesa Ridge), NGH potential in Svalbard’s fjords and near-shore environment is poorly constrained. In this study we modelled the NGH stability zone (GH...
Published in: | Journal of Natural Gas Science and Engineering |
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ftoslouniv:oai:www.duo.uio.no:10852/92495 2023-05-15T15:07:05+02:00 Modelling of the gas hydrate potential in Svalbard's fjords Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim 2021-08-11T11:44:16Z http://hdl.handle.net/10852/92495 http://urn.nb.no/URN:NBN:no-95075 https://doi.org/10.1016/j.jngse.2021.104127 EN eng NFR/257579 NFR/228107 http://urn.nb.no/URN:NBN:no-95075 Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim . Modelling of the gas hydrate potential in Svalbard's fjords. Journal of Natural Gas Science and Engineering. 2021, 94 http://hdl.handle.net/10852/92495 1925287 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Natural Gas Science and Engineering&rft.volume=94&rft.spage=&rft.date=2021 Journal of Natural Gas Science and Engineering 94 15 https://doi.org/10.1016/j.jngse.2021.104127 URN:NBN:no-95075 Fulltext https://www.duo.uio.no/bitstream/handle/10852/92495/1/BetlemetalModelling.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 1875-5100 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2021 ftoslouniv https://doi.org/10.1016/j.jngse.2021.104127 2022-03-16T23:33:55Z Large amounts of methane are trapped as natural gas hydrate (NGH) in the sediments of the Arctic. Unlike NGH provinces offshore west of Svalbard (Vestnesa Ridge), NGH potential in Svalbard’s fjords and near-shore environment is poorly constrained. In this study we modelled the NGH stability zone (GHSZ) to determine the NGH formation potential within the fjords of Svalbard. We applied a nearest neighbour interpolation method to dynamically derive statistical bottom-water temperature (BWT) trends from available CTD data. The BWT trends along with available geothermal gradient data constrained Svalbard-wide sub-bottom thermobaric models suitable for GHSZ modelling in the near subsurface. Analyses of source rock and fluid seepage data in Isfjorden, including 15 newly identified acoustic gas flares, indicate an active petroleum system with fluid migration reaching the seafloor with significant contributions of higher-order hydrocarbons to the gas feed. A GHSZ is predicted for most fjords at mean BWT conditions and 95:5 methane:ethane gas compositions. Suitable conditions for pure methane NGH formation are only met in the deepest parts of Isfjorden, Hinlopenstretet, Kross- and Kongsfjorden, and Rijpfjorden. Temporal constraints implemented along the well-defined Isfjorden transect indicated a notable negative response to water column warming. The predicted GHSZ across Svalbard’s fjords is likely to disappear over the next few decades. Article in Journal/Newspaper Arctic Isfjord* Isfjorden Kongsfjord* Kongsfjorden Rijpfjord* Svalbard Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Hinlopenstretet ENVELOPE(20.728,20.728,79.246,79.246) Kross ENVELOPE(-21.161,-21.161,63.981,63.981) Rijpfjorden ENVELOPE(22.188,22.188,80.165,80.165) Svalbard Journal of Natural Gas Science and Engineering 94 104127 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Large amounts of methane are trapped as natural gas hydrate (NGH) in the sediments of the Arctic. Unlike NGH provinces offshore west of Svalbard (Vestnesa Ridge), NGH potential in Svalbard’s fjords and near-shore environment is poorly constrained. In this study we modelled the NGH stability zone (GHSZ) to determine the NGH formation potential within the fjords of Svalbard. We applied a nearest neighbour interpolation method to dynamically derive statistical bottom-water temperature (BWT) trends from available CTD data. The BWT trends along with available geothermal gradient data constrained Svalbard-wide sub-bottom thermobaric models suitable for GHSZ modelling in the near subsurface. Analyses of source rock and fluid seepage data in Isfjorden, including 15 newly identified acoustic gas flares, indicate an active petroleum system with fluid migration reaching the seafloor with significant contributions of higher-order hydrocarbons to the gas feed. A GHSZ is predicted for most fjords at mean BWT conditions and 95:5 methane:ethane gas compositions. Suitable conditions for pure methane NGH formation are only met in the deepest parts of Isfjorden, Hinlopenstretet, Kross- and Kongsfjorden, and Rijpfjorden. Temporal constraints implemented along the well-defined Isfjorden transect indicated a notable negative response to water column warming. The predicted GHSZ across Svalbard’s fjords is likely to disappear over the next few decades. |
format |
Article in Journal/Newspaper |
author |
Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim |
spellingShingle |
Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim Modelling of the gas hydrate potential in Svalbard's fjords |
author_facet |
Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim |
author_sort |
Betlem, Peter |
title |
Modelling of the gas hydrate potential in Svalbard's fjords |
title_short |
Modelling of the gas hydrate potential in Svalbard's fjords |
title_full |
Modelling of the gas hydrate potential in Svalbard's fjords |
title_fullStr |
Modelling of the gas hydrate potential in Svalbard's fjords |
title_full_unstemmed |
Modelling of the gas hydrate potential in Svalbard's fjords |
title_sort |
modelling of the gas hydrate potential in svalbard's fjords |
publishDate |
2021 |
url |
http://hdl.handle.net/10852/92495 http://urn.nb.no/URN:NBN:no-95075 https://doi.org/10.1016/j.jngse.2021.104127 |
long_lat |
ENVELOPE(20.728,20.728,79.246,79.246) ENVELOPE(-21.161,-21.161,63.981,63.981) ENVELOPE(22.188,22.188,80.165,80.165) |
geographic |
Arctic Hinlopenstretet Kross Rijpfjorden Svalbard |
geographic_facet |
Arctic Hinlopenstretet Kross Rijpfjorden Svalbard |
genre |
Arctic Isfjord* Isfjorden Kongsfjord* Kongsfjorden Rijpfjord* Svalbard |
genre_facet |
Arctic Isfjord* Isfjorden Kongsfjord* Kongsfjorden Rijpfjord* Svalbard |
op_source |
1875-5100 |
op_relation |
NFR/257579 NFR/228107 http://urn.nb.no/URN:NBN:no-95075 Betlem, Peter Roy, Srikumar Birchall, Thomas Hodson, Andrew Noormets, Riko Römer, Miriam Skogseth, Ragnheid Senger, Kim . Modelling of the gas hydrate potential in Svalbard's fjords. Journal of Natural Gas Science and Engineering. 2021, 94 http://hdl.handle.net/10852/92495 1925287 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Natural Gas Science and Engineering&rft.volume=94&rft.spage=&rft.date=2021 Journal of Natural Gas Science and Engineering 94 15 https://doi.org/10.1016/j.jngse.2021.104127 URN:NBN:no-95075 Fulltext https://www.duo.uio.no/bitstream/handle/10852/92495/1/BetlemetalModelling.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.jngse.2021.104127 |
container_title |
Journal of Natural Gas Science and Engineering |
container_volume |
94 |
container_start_page |
104127 |
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1766338652400517120 |