High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea
Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2018.06.012 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Barents Sea is an epicontinental shelf sea with a fragmented structure consisting of long fault complexes, basins and basement highs....
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Online Access: | https://hdl.handle.net/10037/13489 https://doi.org/10.1016/j.margeo.2018.06.012 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13489 2023-05-15T14:27:53+02:00 High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea Tasianas, Alexandros Bünz, Stefan Bellwald, Benjamin Hammer, Øyvind Planke, Sverre Lebedeva-Ivanova, Nina Krassakis, Pavlos 2018-06-21 https://hdl.handle.net/10037/13489 https://doi.org/10.1016/j.margeo.2018.06.012 eng eng Elsevier Marine Geology info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ info:eu-repo/grantAgreement/EC/FP7-ENVIRONMENT/265847/EU/Sub-seabed CO2 Storage: Impact on Marine Ecosystems/ECO2/ Tasianas, A., Bünz, S., Bellwald, B., Hammer, Ø., Planke, S., Lebedeva-Ivanova, N. & Krassakis, P. (2018). High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea. Marine Geology, 403, 247-261. https://doi.org/10.1016/j.margeo.2018.06.012 FRIDAID 1594647 doi:10.1016/j.margeo.2018.06.012 0025-3227 1872-6151 https://hdl.handle.net/10037/13489 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid flow Pockmarks Ploughmarks Barents Sea P-Cable Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1016/j.margeo.2018.06.012 2021-06-25T17:56:00Z Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2018.06.012 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Barents Sea is an epicontinental shelf sea with a fragmented structure consisting of long fault complexes, basins and basement highs. Fluid leakage from deep-seated hydrocarbon accumulations is a widespread phenomenon and mostly related to its denudation history during the glacial/interglacial cycles. In this study, we aimed to better understand shallow fluid flow processes that have led to the formation of numerous pockmarks observed at the seabed, in this area. To achieve this goal, we acquired and interpreted high-resolution 3D seismic and multibeam swath bathymetry data from the Snøhvit area in the Hammerfest Basin, SW Barents Sea. The high-resolution 3D seismic data were obtained using the P-Cable system, which consists of 14 streamers and allows for a vertical resolution of ~1.5 m and a bin size of 6.25 × 6.25 m to be obtained. The frequency bandwidth of this type of acquisition configuration is approximately 50–300 Hz. Seismic surfaces and volume attributes, such as variance and amplitude, have been used to identify potential fluid accumulations and fluid flow pathways. Several small fluid accumulations occur at the Upper Regional Unconformity separating the glacial and pre-glacial sedimentary formations. Together, these subsurface structures and fluid accumulations control the presence of pockmarks in the Snøhvit study area. Two different types of pockmarks occur at the seabed: a few pockmarks with elliptical shape, up to a few hundred meters wide and with depths up to 12 m, and numerous circular, small, “unit pockmarks” that are only up to 20 m wide and up to 1 m deep. Both types of pockmarks are found within glacial ploughmarks, suggesting that they likely formed during deglaciation or afterwards. Some of the larger normal pockmarks show columnar leakage zones beneath them. Pressure and temperature conditions were favourable for the formation of gas hydrates. During deglaciation, gases may have been released from dissociating gas hydrates prolonging the period over which active seepage occurred. At present, there is no evidence from the 3D seismic data of active gas seepage in the Snøhvit area. Low sedimentation rates or the influence of strong deep ocean currents may explain why these pockmarks can still be identified on the contemporary seabed. Article in Journal/Newspaper Arctic Barents Sea Hammerfest Hammerfest Basin Snøhvit University of Tromsø: Munin Open Research Archive Barents Sea Marine Geology 403 247 261 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid flow Pockmarks Ploughmarks Barents Sea P-Cable |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid flow Pockmarks Ploughmarks Barents Sea P-Cable Tasianas, Alexandros Bünz, Stefan Bellwald, Benjamin Hammer, Øyvind Planke, Sverre Lebedeva-Ivanova, Nina Krassakis, Pavlos High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Fluid flow Pockmarks Ploughmarks Barents Sea P-Cable |
description |
Accepted manuscript version. Published version available at https://doi.org/10.1016/j.margeo.2018.06.012 . Accepted manuscript version, licensed CC BY-NC-ND 4.0. The Barents Sea is an epicontinental shelf sea with a fragmented structure consisting of long fault complexes, basins and basement highs. Fluid leakage from deep-seated hydrocarbon accumulations is a widespread phenomenon and mostly related to its denudation history during the glacial/interglacial cycles. In this study, we aimed to better understand shallow fluid flow processes that have led to the formation of numerous pockmarks observed at the seabed, in this area. To achieve this goal, we acquired and interpreted high-resolution 3D seismic and multibeam swath bathymetry data from the Snøhvit area in the Hammerfest Basin, SW Barents Sea. The high-resolution 3D seismic data were obtained using the P-Cable system, which consists of 14 streamers and allows for a vertical resolution of ~1.5 m and a bin size of 6.25 × 6.25 m to be obtained. The frequency bandwidth of this type of acquisition configuration is approximately 50–300 Hz. Seismic surfaces and volume attributes, such as variance and amplitude, have been used to identify potential fluid accumulations and fluid flow pathways. Several small fluid accumulations occur at the Upper Regional Unconformity separating the glacial and pre-glacial sedimentary formations. Together, these subsurface structures and fluid accumulations control the presence of pockmarks in the Snøhvit study area. Two different types of pockmarks occur at the seabed: a few pockmarks with elliptical shape, up to a few hundred meters wide and with depths up to 12 m, and numerous circular, small, “unit pockmarks” that are only up to 20 m wide and up to 1 m deep. Both types of pockmarks are found within glacial ploughmarks, suggesting that they likely formed during deglaciation or afterwards. Some of the larger normal pockmarks show columnar leakage zones beneath them. Pressure and temperature conditions were favourable for the formation of gas hydrates. During deglaciation, gases may have been released from dissociating gas hydrates prolonging the period over which active seepage occurred. At present, there is no evidence from the 3D seismic data of active gas seepage in the Snøhvit area. Low sedimentation rates or the influence of strong deep ocean currents may explain why these pockmarks can still be identified on the contemporary seabed. |
format |
Article in Journal/Newspaper |
author |
Tasianas, Alexandros Bünz, Stefan Bellwald, Benjamin Hammer, Øyvind Planke, Sverre Lebedeva-Ivanova, Nina Krassakis, Pavlos |
author_facet |
Tasianas, Alexandros Bünz, Stefan Bellwald, Benjamin Hammer, Øyvind Planke, Sverre Lebedeva-Ivanova, Nina Krassakis, Pavlos |
author_sort |
Tasianas, Alexandros |
title |
High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
title_short |
High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
title_full |
High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
title_fullStr |
High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
title_full_unstemmed |
High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea |
title_sort |
high-resolution 3d seismic study of pockmarks and shallow fluid flow systems at the snøhvit hydrocarbon field in the sw barents sea |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/13489 https://doi.org/10.1016/j.margeo.2018.06.012 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Arctic Barents Sea Hammerfest Hammerfest Basin Snøhvit |
genre_facet |
Arctic Barents Sea Hammerfest Hammerfest Basin Snøhvit |
op_relation |
Marine Geology info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ info:eu-repo/grantAgreement/EC/FP7-ENVIRONMENT/265847/EU/Sub-seabed CO2 Storage: Impact on Marine Ecosystems/ECO2/ Tasianas, A., Bünz, S., Bellwald, B., Hammer, Ø., Planke, S., Lebedeva-Ivanova, N. & Krassakis, P. (2018). High-resolution 3D seismic study of pockmarks and shallow fluid flow systems at the Snøhvit hydrocarbon field in the SW Barents Sea. Marine Geology, 403, 247-261. https://doi.org/10.1016/j.margeo.2018.06.012 FRIDAID 1594647 doi:10.1016/j.margeo.2018.06.012 0025-3227 1872-6151 https://hdl.handle.net/10037/13489 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2018.06.012 |
container_title |
Marine Geology |
container_volume |
403 |
container_start_page |
247 |
op_container_end_page |
261 |
_version_ |
1766301952208011264 |