Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway
Deep sea pockmarks underlain by chimney-like or pipe structures that contain methane hydrate are abundant along the Norwegian continental margin. In such hydrate provinces the interaction between hydrate formation and fluid flow has significance for benthic ecosystems and possibly climate change. Th...
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Online Access: | https://oceanrep.geomar.de/id/eprint/32934/ https://oceanrep.geomar.de/id/eprint/32934/1/Attias.pdf https://doi.org/10.1093/gji/ggw188 |
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ftoceanrep:oai:oceanrep.geomar.de:32934 2023-05-15T17:12:03+02:00 Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway Attias, Eric Weitemeyer, Karen Minshull, Tim A. Best, Angus I. Sinha, Martin Jegen-Kulcsar, Marion Hölz, Sebastian Berndt, Christian 2016-08 text https://oceanrep.geomar.de/id/eprint/32934/ https://oceanrep.geomar.de/id/eprint/32934/1/Attias.pdf https://doi.org/10.1093/gji/ggw188 en eng Wiley https://oceanrep.geomar.de/id/eprint/32934/1/Attias.pdf Attias, E., Weitemeyer, K., Minshull, T. A., Best, A. I., Sinha, M., Jegen-Kulcsar, M. , Hölz, S. and Berndt, C. (2016) Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway. Open Access Geophysical Journal International, 206 (2). pp. 1093-1110. DOI 10.1093/gji/ggw188 <https://doi.org/10.1093/gji%2Fggw188>. doi:10.1093/gji/ggw188 info:eu-repo/semantics/openAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1093/gji/ggw188 2023-04-07T15:25:51Z Deep sea pockmarks underlain by chimney-like or pipe structures that contain methane hydrate are abundant along the Norwegian continental margin. In such hydrate provinces the interaction between hydrate formation and fluid flow has significance for benthic ecosystems and possibly climate change. The Nyegga region, situated on the western Norwegian continental slope, is characterized by an extensive pockmark field known to accommodate substantial methane gas hydrate deposits. The aim of this study is to detect and delineate both the gas hydrate and free gas reservoirs at one of Nyegga's pockmarks. In 2012, a marine controlled-source electromagnetic (CSEM) survey was performed at a pockmark in this region, where high-resolution three-dimensional seismic data were previously collected in 2006. Two-dimensional CSEM inversions were computed using the data acquired by ocean bottom electrical field receivers. Our results, derived from unconstrained and seismically constrained CSEM inversions, suggest the presence of two distinctive resistivity anomalies beneath the pockmark: a shallow vertical anomaly at the underlying pipe structure, likely due to gas hydrate accumulation, and a laterally extensive anomaly attributed to a free gas zone below the base of the gas hydrate stability zone. This work contributes to a robust characterization of gas hydrate deposits within sub-seafloor fluid flow pipe structures. Article in Journal/Newspaper Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Norway Nyegga ENVELOPE(9.443,9.443,62.612,62.612) Geophysical Journal International 206 2 1093 1110 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Deep sea pockmarks underlain by chimney-like or pipe structures that contain methane hydrate are abundant along the Norwegian continental margin. In such hydrate provinces the interaction between hydrate formation and fluid flow has significance for benthic ecosystems and possibly climate change. The Nyegga region, situated on the western Norwegian continental slope, is characterized by an extensive pockmark field known to accommodate substantial methane gas hydrate deposits. The aim of this study is to detect and delineate both the gas hydrate and free gas reservoirs at one of Nyegga's pockmarks. In 2012, a marine controlled-source electromagnetic (CSEM) survey was performed at a pockmark in this region, where high-resolution three-dimensional seismic data were previously collected in 2006. Two-dimensional CSEM inversions were computed using the data acquired by ocean bottom electrical field receivers. Our results, derived from unconstrained and seismically constrained CSEM inversions, suggest the presence of two distinctive resistivity anomalies beneath the pockmark: a shallow vertical anomaly at the underlying pipe structure, likely due to gas hydrate accumulation, and a laterally extensive anomaly attributed to a free gas zone below the base of the gas hydrate stability zone. This work contributes to a robust characterization of gas hydrate deposits within sub-seafloor fluid flow pipe structures. |
format |
Article in Journal/Newspaper |
author |
Attias, Eric Weitemeyer, Karen Minshull, Tim A. Best, Angus I. Sinha, Martin Jegen-Kulcsar, Marion Hölz, Sebastian Berndt, Christian |
spellingShingle |
Attias, Eric Weitemeyer, Karen Minshull, Tim A. Best, Angus I. Sinha, Martin Jegen-Kulcsar, Marion Hölz, Sebastian Berndt, Christian Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
author_facet |
Attias, Eric Weitemeyer, Karen Minshull, Tim A. Best, Angus I. Sinha, Martin Jegen-Kulcsar, Marion Hölz, Sebastian Berndt, Christian |
author_sort |
Attias, Eric |
title |
Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
title_short |
Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
title_full |
Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
title_fullStr |
Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
title_full_unstemmed |
Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway |
title_sort |
controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore norway |
publisher |
Wiley |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/32934/ https://oceanrep.geomar.de/id/eprint/32934/1/Attias.pdf https://doi.org/10.1093/gji/ggw188 |
long_lat |
ENVELOPE(9.443,9.443,62.612,62.612) |
geographic |
Norway Nyegga |
geographic_facet |
Norway Nyegga |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/32934/1/Attias.pdf Attias, E., Weitemeyer, K., Minshull, T. A., Best, A. I., Sinha, M., Jegen-Kulcsar, M. , Hölz, S. and Berndt, C. (2016) Controlled-source electromagnetic and seismic delineation of sub-seafloor fluid flow structures in a gas hydrate province, offshore Norway. Open Access Geophysical Journal International, 206 (2). pp. 1093-1110. DOI 10.1093/gji/ggw188 <https://doi.org/10.1093/gji%2Fggw188>. doi:10.1093/gji/ggw188 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/gji/ggw188 |
container_title |
Geophysical Journal International |
container_volume |
206 |
container_issue |
2 |
container_start_page |
1093 |
op_container_end_page |
1110 |
_version_ |
1766068810771595264 |