New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand
In this thesis, four fluid flow systems are studied in terms of their development, venting activity, and relation to past and current climate warming periods. The studies were accomplished by using a variety of geophysical methods, including 2D and 3D seismic, sidescan sonar, and sediment echosounde...
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ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00017214 2024-06-23T07:54:58+00:00 New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand Neue Einblicke in Fluidfluss- und Fluidaustrittsprozesse - Fallbeispiele aus dem Nordatlantik und vor Neuseeland Dumke, Ines Berndt, Christian Krastel, Sebastian 2015 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-172146 https://macau.uni-kiel.de/receive/diss_mods_00017214 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00006152/InesDumke_Thesis.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-172146 https://macau.uni-kiel.de/receive/diss_mods_00017214 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00006152/InesDumke_Thesis.pdf https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess thesis ddc:550 fluid flow seepage gas hydrates North Atlantic New Zealand Svalbard Fluidfluss Fluidaustritt Gashydrate Nordatlantik Neuseeland Spitzbergen dissertation Text doc-type:PhDThesis 2015 ftunivkiel 2024-06-12T14:20:04Z In this thesis, four fluid flow systems are studied in terms of their development, venting activity, and relation to past and current climate warming periods. The studies were accomplished by using a variety of geophysical methods, including 2D and 3D seismic, sidescan sonar, and sediment echosounder methods, as well as heat flow measurements, geochemical analyses, and numerical modelling. The first case study presents a fluid flow system early in its development, located north of the Knipovich Ridge on the western Svalbard margin. Gas hydrates in this region are more widespread than anywhere else in the eastern North Atlantic, indicating a substantial gas reservoir. The origin of the gas is discussed, as are the source rock potential on the Svalbard margin and the role of the Knipovich Ridge with respect to thermogenic gas production. Case study 2 focuses on a more developed fluid flow system, the Giant Gjallar Vent in the Norwegian Sea. This vent system is one of the largest in the North Atlantic and is characterised by two prominent conduits that terminate beneath the seabed. Based on new seismic data, the activity history of the vent is re-interpreted and implications on the future development of this structure are discussed. Case study 3 deals with a deviation from the classic fluid flow system: on the upper continental margin offshore Svalbard, fluid venting occurs without fluid conduits being present, as the reservoir crops out at the seabed. Seepage is linked to dissociation of gas hydrates, which is caused by seasonal fluctuations of bottom-water temperatures. The onset of periodic gas hydrate formation and dissociation is constrained from carbonate samples and discussed with respect to ongoing decadal-scale global warming. The fourth case study looks at cold seeps on the Hikurangi Margin offshore New Zealand, which represent a fully developed fluid flow system. Seafloor expressions imaged with sidescan sonar fall into four distinct types of backscatter pattern. These patterns are integrated with ... Doctoral or Postdoctoral Thesis North Atlantic Norwegian Sea Spitzbergen Svalbard Svalbard margin MACAU: Open Access Repository of Kiel University Svalbard Norwegian Sea New Zealand Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
thesis ddc:550 fluid flow seepage gas hydrates North Atlantic New Zealand Svalbard Fluidfluss Fluidaustritt Gashydrate Nordatlantik Neuseeland Spitzbergen |
spellingShingle |
thesis ddc:550 fluid flow seepage gas hydrates North Atlantic New Zealand Svalbard Fluidfluss Fluidaustritt Gashydrate Nordatlantik Neuseeland Spitzbergen Dumke, Ines New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
topic_facet |
thesis ddc:550 fluid flow seepage gas hydrates North Atlantic New Zealand Svalbard Fluidfluss Fluidaustritt Gashydrate Nordatlantik Neuseeland Spitzbergen |
description |
In this thesis, four fluid flow systems are studied in terms of their development, venting activity, and relation to past and current climate warming periods. The studies were accomplished by using a variety of geophysical methods, including 2D and 3D seismic, sidescan sonar, and sediment echosounder methods, as well as heat flow measurements, geochemical analyses, and numerical modelling. The first case study presents a fluid flow system early in its development, located north of the Knipovich Ridge on the western Svalbard margin. Gas hydrates in this region are more widespread than anywhere else in the eastern North Atlantic, indicating a substantial gas reservoir. The origin of the gas is discussed, as are the source rock potential on the Svalbard margin and the role of the Knipovich Ridge with respect to thermogenic gas production. Case study 2 focuses on a more developed fluid flow system, the Giant Gjallar Vent in the Norwegian Sea. This vent system is one of the largest in the North Atlantic and is characterised by two prominent conduits that terminate beneath the seabed. Based on new seismic data, the activity history of the vent is re-interpreted and implications on the future development of this structure are discussed. Case study 3 deals with a deviation from the classic fluid flow system: on the upper continental margin offshore Svalbard, fluid venting occurs without fluid conduits being present, as the reservoir crops out at the seabed. Seepage is linked to dissociation of gas hydrates, which is caused by seasonal fluctuations of bottom-water temperatures. The onset of periodic gas hydrate formation and dissociation is constrained from carbonate samples and discussed with respect to ongoing decadal-scale global warming. The fourth case study looks at cold seeps on the Hikurangi Margin offshore New Zealand, which represent a fully developed fluid flow system. Seafloor expressions imaged with sidescan sonar fall into four distinct types of backscatter pattern. These patterns are integrated with ... |
author2 |
Berndt, Christian Krastel, Sebastian |
format |
Doctoral or Postdoctoral Thesis |
author |
Dumke, Ines |
author_facet |
Dumke, Ines |
author_sort |
Dumke, Ines |
title |
New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
title_short |
New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
title_full |
New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
title_fullStr |
New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
title_full_unstemmed |
New insights into fluid flow and seep processes - Case studies from the North Atlantic and offshore New Zealand |
title_sort |
new insights into fluid flow and seep processes - case studies from the north atlantic and offshore new zealand |
publishDate |
2015 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-172146 https://macau.uni-kiel.de/receive/diss_mods_00017214 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00006152/InesDumke_Thesis.pdf |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Svalbard Norwegian Sea New Zealand Knipovich Ridge |
geographic_facet |
Svalbard Norwegian Sea New Zealand Knipovich Ridge |
genre |
North Atlantic Norwegian Sea Spitzbergen Svalbard Svalbard margin |
genre_facet |
North Atlantic Norwegian Sea Spitzbergen Svalbard Svalbard margin |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-172146 https://macau.uni-kiel.de/receive/diss_mods_00017214 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00006152/InesDumke_Thesis.pdf |
op_rights |
https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802647329703985152 |