A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites
Intact natural gas hydrates recovered on the West Aftican margin in the South Atlantic Ocean (ZaiAngo and Neris IIrojects) and from the Norwegian Sea (Hakon Mosby Mud Volcano) are investigated by micro-Raman spectroscopy at ambient pressure and low temperature. The gas hydrates collected at differen...
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ftarchimer:oai:archimer.ifremer.fr:4303 2023-05-15T17:47:06+02:00 A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites Chazallon, B Focsa, C Charlou, Jean-luc Bourry, Christophe Donval, Jean-pierre 2007-09 application/pdf https://archimer.ifremer.fr/doc/2007/publication-4303.pdf https://doi.org/10.1016/j.chemgeo.2007.06.012 https://archimer.ifremer.fr/doc/00000/4303/ eng eng Elsevier https://archimer.ifremer.fr/doc/2007/publication-4303.pdf doi:10.1016/j.chemgeo.2007.06.012 https://archimer.ifremer.fr/doc/00000/4303/ 2007 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Chemical Geology (0009-2541) (Elsevier), 2007-09 , Vol. 244 , N. 1-2 , P. 175-185 Micro Raman spectroscopy H2S hydrate CH4 hydrate Natural clathrate hydrates text Publication info:eu-repo/semantics/article 2007 ftarchimer https://doi.org/10.1016/j.chemgeo.2007.06.012 2021-09-23T20:15:58Z Intact natural gas hydrates recovered on the West Aftican margin in the South Atlantic Ocean (ZaiAngo and Neris IIrojects) and from the Norwegian Sea (Hakon Mosby Mud Volcano) are investigated by micro-Raman spectroscopy at ambient pressure and low temperature. The gas hydrates collected at different geological sites contain a high methane concentration relative to other minor components that are slightly dispersed in the samples. They crystallize in a type I cubic lattice structure as also confirmed by our preliminary synchrotron diffraction results obtained on the ZaiAngo specimen. However, detailed analysis of selected microscopic areas reveals a variation in the gas distribution among the different specimens. Trace amounts of CO2 and H2S can be identified by their characteristic vibrational signatures in the 1000-3800 cm(-1) spectral range. They are found to be co-clathrated with methane. Their presence produces a compositional effect on the relative cage occupancy of CH4, as determined from the integrated band intensity ratio corresponding to the molecular stretching modes of methane in the hydrate. The comparative Raman analysis of synthetic hydrates of H2S, CH4 and CH4-deuterohydrates allows the unambiguous assignment of weak band overtones of trapped methane and co-clatht-ated H2S molecular vibrations. (C) 2007 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Norwegian Sea South Atlantic Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Norwegian Sea Chemical Geology 244 1-2 175 185 |
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 |
Micro Raman spectroscopy H2S hydrate CH4 hydrate Natural clathrate hydrates |
spellingShingle |
Micro Raman spectroscopy H2S hydrate CH4 hydrate Natural clathrate hydrates Chazallon, B Focsa, C Charlou, Jean-luc Bourry, Christophe Donval, Jean-pierre A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
topic_facet |
Micro Raman spectroscopy H2S hydrate CH4 hydrate Natural clathrate hydrates |
description |
Intact natural gas hydrates recovered on the West Aftican margin in the South Atlantic Ocean (ZaiAngo and Neris IIrojects) and from the Norwegian Sea (Hakon Mosby Mud Volcano) are investigated by micro-Raman spectroscopy at ambient pressure and low temperature. The gas hydrates collected at different geological sites contain a high methane concentration relative to other minor components that are slightly dispersed in the samples. They crystallize in a type I cubic lattice structure as also confirmed by our preliminary synchrotron diffraction results obtained on the ZaiAngo specimen. However, detailed analysis of selected microscopic areas reveals a variation in the gas distribution among the different specimens. Trace amounts of CO2 and H2S can be identified by their characteristic vibrational signatures in the 1000-3800 cm(-1) spectral range. They are found to be co-clathrated with methane. Their presence produces a compositional effect on the relative cage occupancy of CH4, as determined from the integrated band intensity ratio corresponding to the molecular stretching modes of methane in the hydrate. The comparative Raman analysis of synthetic hydrates of H2S, CH4 and CH4-deuterohydrates allows the unambiguous assignment of weak band overtones of trapped methane and co-clatht-ated H2S molecular vibrations. (C) 2007 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Chazallon, B Focsa, C Charlou, Jean-luc Bourry, Christophe Donval, Jean-pierre |
author_facet |
Chazallon, B Focsa, C Charlou, Jean-luc Bourry, Christophe Donval, Jean-pierre |
author_sort |
Chazallon, B |
title |
A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
title_short |
A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
title_full |
A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
title_fullStr |
A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
title_full_unstemmed |
A comparative Raman spectroscopic study of natural gas hydrates collected at different geological sites |
title_sort |
comparative raman spectroscopic study of natural gas hydrates collected at different geological sites |
publisher |
Elsevier |
publishDate |
2007 |
url |
https://archimer.ifremer.fr/doc/2007/publication-4303.pdf https://doi.org/10.1016/j.chemgeo.2007.06.012 https://archimer.ifremer.fr/doc/00000/4303/ |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea South Atlantic Ocean |
genre_facet |
Norwegian Sea South Atlantic Ocean |
op_source |
Chemical Geology (0009-2541) (Elsevier), 2007-09 , Vol. 244 , N. 1-2 , P. 175-185 |
op_relation |
https://archimer.ifremer.fr/doc/2007/publication-4303.pdf doi:10.1016/j.chemgeo.2007.06.012 https://archimer.ifremer.fr/doc/00000/4303/ |
op_rights |
2007 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.chemgeo.2007.06.012 |
container_title |
Chemical Geology |
container_volume |
244 |
container_issue |
1-2 |
container_start_page |
175 |
op_container_end_page |
185 |
_version_ |
1766151405537591296 |