Effect of gas hydrates melting on seafloor slope instability
We present a theoretical study of the thermodynamic chemical equilibrium of gas hydrate in soil by taking into account the influence of temperature, pressure, pore water chemistry, and the mean pore size distribution. The model uses a new formulation based on the enthalpy form of the law of conserva...
Published in: | Marine Geology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2004
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/2004/publication-699.pdf https://doi.org/10.1016/j.margeo.2004.10.015 https://archimer.ifremer.fr/doc/00000/699/ |
id |
ftarchimer:oai:archimer.ifremer.fr:699 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:699 2023-05-15T17:12:05+02:00 Effect of gas hydrates melting on seafloor slope instability Sultan, Nabil Cochonat, Pierre Foucher, Jean-paul Mienert, J 2004-12 application/pdf https://archimer.ifremer.fr/doc/2004/publication-699.pdf https://doi.org/10.1016/j.margeo.2004.10.015 https://archimer.ifremer.fr/doc/00000/699/ eng eng Elsevier https://archimer.ifremer.fr/doc/2004/publication-699.pdf doi:10.1016/j.margeo.2004.10.015 https://archimer.ifremer.fr/doc/00000/699/ 2004 Elsevier B.V. All rights reserved info:eu-repo/semantics/openAccess restricted use Marine Geology (0025-3227) (Elsevier), 2004-12 , Vol. 213 , N. 1-4 , P. 379-401 Storegga Slope failure GLE Finite difference Methane hydrate text Publication info:eu-repo/semantics/article 2004 ftarchimer https://doi.org/10.1016/j.margeo.2004.10.015 2021-09-23T20:13:16Z We present a theoretical study of the thermodynamic chemical equilibrium of gas hydrate in soil by taking into account the influence of temperature, pressure, pore water chemistry, and the mean pore size distribution. The model uses a new formulation based on the enthalpy form of the law of conservation of energy. The developed model shows that due to a temperature and pressure increase, hydrates may dissociate at the top of the hydrate occurrence zone to ensure a chemical equilibrium with the surrounding bulk water. This original result confirms what has been already shown through experiments. The second part of the paper presents an application of the model through a back-analysis of the giant Storegga Slide on the Norwegian margin. Two of the most important changes during and since the last deglaciation (hydrostatic pressure due to the change of the sea level and the increase of the sea water temperature) were considered in the calculation. Simulation results show that melting of gas hydrate due to the change of the gas solubility can be at the origin of a retrogressive failure initiated at the lower part of the Storegga slope. Once again, the developed model leads to predictions, which are supported by laboratory experiment results, but contradictory to previous interpretations and beliefs considering that hydrate dissociation occurs only at the bottom of the gas hydrate stability zone. Article in Journal/Newspaper Methane hydrate Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Storegga ENVELOPE(18.251,18.251,68.645,68.645) Storegga Slope ENVELOPE(5.500,5.500,63.000,63.000) Marine Geology 213 1-4 379 401 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Storegga Slope failure GLE Finite difference Methane hydrate |
spellingShingle |
Storegga Slope failure GLE Finite difference Methane hydrate Sultan, Nabil Cochonat, Pierre Foucher, Jean-paul Mienert, J Effect of gas hydrates melting on seafloor slope instability |
topic_facet |
Storegga Slope failure GLE Finite difference Methane hydrate |
description |
We present a theoretical study of the thermodynamic chemical equilibrium of gas hydrate in soil by taking into account the influence of temperature, pressure, pore water chemistry, and the mean pore size distribution. The model uses a new formulation based on the enthalpy form of the law of conservation of energy. The developed model shows that due to a temperature and pressure increase, hydrates may dissociate at the top of the hydrate occurrence zone to ensure a chemical equilibrium with the surrounding bulk water. This original result confirms what has been already shown through experiments. The second part of the paper presents an application of the model through a back-analysis of the giant Storegga Slide on the Norwegian margin. Two of the most important changes during and since the last deglaciation (hydrostatic pressure due to the change of the sea level and the increase of the sea water temperature) were considered in the calculation. Simulation results show that melting of gas hydrate due to the change of the gas solubility can be at the origin of a retrogressive failure initiated at the lower part of the Storegga slope. Once again, the developed model leads to predictions, which are supported by laboratory experiment results, but contradictory to previous interpretations and beliefs considering that hydrate dissociation occurs only at the bottom of the gas hydrate stability zone. |
format |
Article in Journal/Newspaper |
author |
Sultan, Nabil Cochonat, Pierre Foucher, Jean-paul Mienert, J |
author_facet |
Sultan, Nabil Cochonat, Pierre Foucher, Jean-paul Mienert, J |
author_sort |
Sultan, Nabil |
title |
Effect of gas hydrates melting on seafloor slope instability |
title_short |
Effect of gas hydrates melting on seafloor slope instability |
title_full |
Effect of gas hydrates melting on seafloor slope instability |
title_fullStr |
Effect of gas hydrates melting on seafloor slope instability |
title_full_unstemmed |
Effect of gas hydrates melting on seafloor slope instability |
title_sort |
effect of gas hydrates melting on seafloor slope instability |
publisher |
Elsevier |
publishDate |
2004 |
url |
https://archimer.ifremer.fr/doc/2004/publication-699.pdf https://doi.org/10.1016/j.margeo.2004.10.015 https://archimer.ifremer.fr/doc/00000/699/ |
long_lat |
ENVELOPE(18.251,18.251,68.645,68.645) ENVELOPE(5.500,5.500,63.000,63.000) |
geographic |
Storegga Storegga Slope |
geographic_facet |
Storegga Storegga Slope |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Marine Geology (0025-3227) (Elsevier), 2004-12 , Vol. 213 , N. 1-4 , P. 379-401 |
op_relation |
https://archimer.ifremer.fr/doc/2004/publication-699.pdf doi:10.1016/j.margeo.2004.10.015 https://archimer.ifremer.fr/doc/00000/699/ |
op_rights |
2004 Elsevier B.V. All rights reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.margeo.2004.10.015 |
container_title |
Marine Geology |
container_volume |
213 |
container_issue |
1-4 |
container_start_page |
379 |
op_container_end_page |
401 |
_version_ |
1766068850319687680 |