Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard
Gas hydrates store a large amount of methane (>500 Gt of Carbon) in continental margins and permafrost environments. Some of these deposits occur in climate sensitive areas, such as Arctic and permafrost settings. Gas hydrates occur extensively in the Vestnesa Ridge, a contourite drift deposit on...
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UiT Norges arktiske universitet
2019
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ftunivtroemsoe:oai:munin.uit.no:10037/15824 2023-05-15T14:28:11+02:00 Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard Singhroha, Sunny 2019-06-18 https://hdl.handle.net/10037/15824 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway Paper I: Singhroha, S., Bünz, S., Plaza-Faverola, A. & Chand, S. (2016). Gas hydrate and free gas detection using seismic quality factor estimates from high-resolution P-Cable 3D seismic data. Interpretation, 4 (1), SA39-SA54. Also available at https://doi.org/10.1190/INT-2015-0023.1 . Accepted manuscript version available in Munin at https://hdl.handle.net/10037/10762 . Paper II: Singhroha, S., Chand, S. & Bünz, S. (2019). Constraints on gas hydrate distribution and morphology in Vestnesa Ridge, W-Svalbard margin using multicomponent ocean-bottom seismic data. (Article in press). Published version in Journal of Geophysical Research: Solid Earth, 124 , 4343-4364, available at https://doi.org/10.1029/2018JB016574 . Available in Munin at https://hdl.handle.net/10037/15818 . Paper III: Singhroha, S., Bünz, S., Plaza-Faverola, A. & Chand, S. Structural control on the distribution of gas hydrates in the Vestnesa Ridge. (Submitted manuscript). Available in the file “thesis_entire.pdf”. info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ 978-82-8236-352-5 (trykt) 978-82-8236-353-2 (pdf) https://hdl.handle.net/10037/15824 openAccess Copyright 2019 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 Doctoral thesis Doktorgradsavhandling 2019 ftunivtroemsoe 2021-06-25T17:56:42Z Gas hydrates store a large amount of methane (>500 Gt of Carbon) in continental margins and permafrost environments. Some of these deposits occur in climate sensitive areas, such as Arctic and permafrost settings. Gas hydrates occur extensively in the Vestnesa Ridge, a contourite drift deposit on the western Svalbard margin. The eastern segment of the Vestnesa Ridge is characterized by the presence of active seepages of gas (primarily methane) from pockmarks at the seafloor. In this thesis, I study the distribution of gas hydrates in marine sediments of the eastern segment of the Vestnesa Ridge. I developed a novel technique that estimates the seismic quality factor Q from broad-bandwidth (20-300 HZ) high-resolution P-Cable 3D seismic data in order to directly detect gas hydrates. Furthermore, this study includes a detailed analysis of P- and S-wave seismic velocities (through travel time and full waveform inversion) and azimuthal velocity analysis using ocean-bottom seismic data. P- and S-wave velocity models are used to estimate gas hydrate saturation using the SCA/DEM rock physics model. The combined analysis of these results suggest the occurrence of gas hydrates in fractures and faults, variations in gas hydrate saturation and morphology across faults indicating a strong structural control on the Vestnesa Ridge gas hydrate system. Doctoral or Postdoctoral Thesis Arctic Arctic permafrost Svalbard Svalbard margin University of Tromsø: Munin Open Research Archive Arctic Svalbard Interpretation 4 1 SA39 SA54 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 Singhroha, Sunny Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 DOKTOR-004 |
description |
Gas hydrates store a large amount of methane (>500 Gt of Carbon) in continental margins and permafrost environments. Some of these deposits occur in climate sensitive areas, such as Arctic and permafrost settings. Gas hydrates occur extensively in the Vestnesa Ridge, a contourite drift deposit on the western Svalbard margin. The eastern segment of the Vestnesa Ridge is characterized by the presence of active seepages of gas (primarily methane) from pockmarks at the seafloor. In this thesis, I study the distribution of gas hydrates in marine sediments of the eastern segment of the Vestnesa Ridge. I developed a novel technique that estimates the seismic quality factor Q from broad-bandwidth (20-300 HZ) high-resolution P-Cable 3D seismic data in order to directly detect gas hydrates. Furthermore, this study includes a detailed analysis of P- and S-wave seismic velocities (through travel time and full waveform inversion) and azimuthal velocity analysis using ocean-bottom seismic data. P- and S-wave velocity models are used to estimate gas hydrate saturation using the SCA/DEM rock physics model. The combined analysis of these results suggest the occurrence of gas hydrates in fractures and faults, variations in gas hydrate saturation and morphology across faults indicating a strong structural control on the Vestnesa Ridge gas hydrate system. |
format |
Doctoral or Postdoctoral Thesis |
author |
Singhroha, Sunny |
author_facet |
Singhroha, Sunny |
author_sort |
Singhroha, Sunny |
title |
Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
title_short |
Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
title_full |
Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
title_fullStr |
Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
title_full_unstemmed |
Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard |
title_sort |
distribution and quantification of gas hydrates and free gas in marine sediments of vestnesa ridge, offshore w-svalbard |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15824 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic permafrost Svalbard Svalbard margin |
genre_facet |
Arctic Arctic permafrost Svalbard Svalbard margin |
op_relation |
Paper I: Singhroha, S., Bünz, S., Plaza-Faverola, A. & Chand, S. (2016). Gas hydrate and free gas detection using seismic quality factor estimates from high-resolution P-Cable 3D seismic data. Interpretation, 4 (1), SA39-SA54. Also available at https://doi.org/10.1190/INT-2015-0023.1 . Accepted manuscript version available in Munin at https://hdl.handle.net/10037/10762 . Paper II: Singhroha, S., Chand, S. & Bünz, S. (2019). Constraints on gas hydrate distribution and morphology in Vestnesa Ridge, W-Svalbard margin using multicomponent ocean-bottom seismic data. (Article in press). Published version in Journal of Geophysical Research: Solid Earth, 124 , 4343-4364, available at https://doi.org/10.1029/2018JB016574 . Available in Munin at https://hdl.handle.net/10037/15818 . Paper III: Singhroha, S., Bünz, S., Plaza-Faverola, A. & Chand, S. Structural control on the distribution of gas hydrates in the Vestnesa Ridge. (Submitted manuscript). Available in the file “thesis_entire.pdf”. info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ 978-82-8236-352-5 (trykt) 978-82-8236-353-2 (pdf) https://hdl.handle.net/10037/15824 |
op_rights |
openAccess Copyright 2019 The Author(s) |
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Interpretation |
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4 |
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1 |
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SA39 |
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SA54 |
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