An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments
Author Posting. © Blackwell, 2006. This article is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 166 (2006): 543–552, doi:10.1111/j.1365-246X.2006.03038.x. The presence of gas hydrate in mari...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/1771 2023-05-15T17:09:31+02:00 An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments Chand, Shyam Minshull, Tim A. Priest, Jeff A. Best, Angus I. Clayton, Christopher R. I. Waite, William F. 2006-07-04 application/pdf https://hdl.handle.net/1912/1771 en_US eng Blackwell Publishing https://doi.org/10.1111/j.1365-246X.2006.03038.x Geophysical Journal International 166 (2006): 543–552 https://hdl.handle.net/1912/1771 doi:10.1111/j.1365-246X.2006.03038.x Geophysical Journal International 166 (2006): 543–552 doi:10.1111/j.1365-246X.2006.03038.x Attenuation Elastic wave theory Gas hydrate P waves S waves Article 2006 ftwhoas https://doi.org/10.1111/j.1365-246X.2006.03038.x 2022-05-28T22:57:22Z Author Posting. © Blackwell, 2006. This article is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 166 (2006): 543–552, doi:10.1111/j.1365-246X.2006.03038.x. The presence of gas hydrate in marine sediments alters their physical properties. In some circumstances, gas hydrate may cement sediment grains together and dramatically increase the seismic P- and S-wave velocities of the composite medium. Hydrate may also form a load-bearing structure within the sediment microstructure, but with different seismic wave attenuation characteristics, changing the attenuation behaviour of the composite. Here we introduce an inversion algorithm based on effective medium modelling to infer hydrate saturations from velocity and attenuation measurements on hydrate-bearing sediments. The velocity increase is modelled as extra binding developed by gas hydrate that strengthens the sediment microstructure. The attenuation increase is modelled through a difference in fluid flow properties caused by different permeabilities in the sediment and hydrate microstructures. We relate velocity and attenuation increases in hydrate-bearing sediments to their hydrate content, using an effective medium inversion algorithm based on the self-consistent approximation (SCA), differential effective medium (DEM) theory, and Biot and squirt flow mechanisms of fluid flow. The inversion algorithm is able to convert observations in compressional and shear wave velocities and attenuations to hydrate saturation in the sediment pore space. We applied our algorithm to a data set from the Mallik 2L–38 well, Mackenzie delta, Canada, and to data from laboratory measurements on gas-rich and water-saturated sand samples. Predictions using our algorithm match the borehole data and water-saturated laboratory data if the proportion of hydrate contributing to the load-bearing structure increases with hydrate saturation. The predictions match the gas-rich ... Article in Journal/Newspaper Mackenzie Delta Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Geophysical Journal International 166 2 543 552 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Attenuation Elastic wave theory Gas hydrate P waves S waves |
spellingShingle |
Attenuation Elastic wave theory Gas hydrate P waves S waves Chand, Shyam Minshull, Tim A. Priest, Jeff A. Best, Angus I. Clayton, Christopher R. I. Waite, William F. An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
topic_facet |
Attenuation Elastic wave theory Gas hydrate P waves S waves |
description |
Author Posting. © Blackwell, 2006. This article is posted here by permission of Blackwell for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 166 (2006): 543–552, doi:10.1111/j.1365-246X.2006.03038.x. The presence of gas hydrate in marine sediments alters their physical properties. In some circumstances, gas hydrate may cement sediment grains together and dramatically increase the seismic P- and S-wave velocities of the composite medium. Hydrate may also form a load-bearing structure within the sediment microstructure, but with different seismic wave attenuation characteristics, changing the attenuation behaviour of the composite. Here we introduce an inversion algorithm based on effective medium modelling to infer hydrate saturations from velocity and attenuation measurements on hydrate-bearing sediments. The velocity increase is modelled as extra binding developed by gas hydrate that strengthens the sediment microstructure. The attenuation increase is modelled through a difference in fluid flow properties caused by different permeabilities in the sediment and hydrate microstructures. We relate velocity and attenuation increases in hydrate-bearing sediments to their hydrate content, using an effective medium inversion algorithm based on the self-consistent approximation (SCA), differential effective medium (DEM) theory, and Biot and squirt flow mechanisms of fluid flow. The inversion algorithm is able to convert observations in compressional and shear wave velocities and attenuations to hydrate saturation in the sediment pore space. We applied our algorithm to a data set from the Mallik 2L–38 well, Mackenzie delta, Canada, and to data from laboratory measurements on gas-rich and water-saturated sand samples. Predictions using our algorithm match the borehole data and water-saturated laboratory data if the proportion of hydrate contributing to the load-bearing structure increases with hydrate saturation. The predictions match the gas-rich ... |
format |
Article in Journal/Newspaper |
author |
Chand, Shyam Minshull, Tim A. Priest, Jeff A. Best, Angus I. Clayton, Christopher R. I. Waite, William F. |
author_facet |
Chand, Shyam Minshull, Tim A. Priest, Jeff A. Best, Angus I. Clayton, Christopher R. I. Waite, William F. |
author_sort |
Chand, Shyam |
title |
An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
title_short |
An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
title_full |
An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
title_fullStr |
An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
title_full_unstemmed |
An effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
title_sort |
effective medium inversion algorithm for gas hydrate quantification and its application to laboratory and borehole measurements of gas hydrate-bearing sediments |
publisher |
Blackwell Publishing |
publishDate |
2006 |
url |
https://hdl.handle.net/1912/1771 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Canada Mackenzie Delta |
geographic_facet |
Canada Mackenzie Delta |
genre |
Mackenzie Delta |
genre_facet |
Mackenzie Delta |
op_source |
Geophysical Journal International 166 (2006): 543–552 doi:10.1111/j.1365-246X.2006.03038.x |
op_relation |
https://doi.org/10.1111/j.1365-246X.2006.03038.x Geophysical Journal International 166 (2006): 543–552 https://hdl.handle.net/1912/1771 doi:10.1111/j.1365-246X.2006.03038.x |
op_doi |
https://doi.org/10.1111/j.1365-246X.2006.03038.x |
container_title |
Geophysical Journal International |
container_volume |
166 |
container_issue |
2 |
container_start_page |
543 |
op_container_end_page |
552 |
_version_ |
1766065623762206720 |