Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling
ABSTRACT Detecting the top and base subsea permafrost from 2D seismic reflection data in shallow marine settings is a non‐trivial task due to the occurrence of strong free surface multiples. The potential to accurately detect permafrost layers on conventional 2D seismic reflection data is assessed t...
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crwiley:10.1002/nsg.12231 2024-09-15T18:11:22+00:00 Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling Duchesne, Mathieu J. Fabien‐Ouellet, Gabriel Bustamante, Jefferson 2022 http://dx.doi.org/10.1002/nsg.12231 https://onlinelibrary.wiley.com/doi/pdf/10.1002/nsg.12231 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nsg.12231 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Near Surface Geophysics volume 21, issue 1, page 3-20 ISSN 1569-4445 1873-0604 journal-article 2022 crwiley https://doi.org/10.1002/nsg.12231 2024-08-09T04:26:53Z ABSTRACT Detecting the top and base subsea permafrost from 2D seismic reflection data in shallow marine settings is a non‐trivial task due to the occurrence of strong free surface multiples. The potential to accurately detect permafrost layers on conventional 2D seismic reflection data is assessed through viscoelastic modelling. Reflection imaging of permafrost layers is examined through the evaluation of specific characteristics of the subsurface, acquisition parameters and their impact. Results show that limitations are related to the principles of the method, the intrinsic nature of the permafrost layers, and the acquisition geometry. The biggest challenge is the occurrence of free surface multiples that overprint the base permafrost reflection, with the worst‐case scenario the case of a thin layer of ice‐bonded sand. Wedge models suggest that if the base permafrost is dipping, it would intersect internal and free surface multiples of the seafloor and the top permafrost and be detected. Also, the amplitude ratio of the base permafrost reflection and the multiples decreases with the increasing thickness of permafrost. Therefore, the crosscutting relationship between the reflection at base permafrost reflection and the multiples might not be enough to detect the base permafrost for thicker permafrost layers. Finally, the experiment results show that, for partially ice‐bonded layers, the attenuation combined with the low reflectivity of the basal interface limits the likelihood to resolve the base permafrost, especially for thick permafrost layers. Article in Journal/Newspaper Ice permafrost wedge* Wiley Online Library Near Surface Geophysics |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Detecting the top and base subsea permafrost from 2D seismic reflection data in shallow marine settings is a non‐trivial task due to the occurrence of strong free surface multiples. The potential to accurately detect permafrost layers on conventional 2D seismic reflection data is assessed through viscoelastic modelling. Reflection imaging of permafrost layers is examined through the evaluation of specific characteristics of the subsurface, acquisition parameters and their impact. Results show that limitations are related to the principles of the method, the intrinsic nature of the permafrost layers, and the acquisition geometry. The biggest challenge is the occurrence of free surface multiples that overprint the base permafrost reflection, with the worst‐case scenario the case of a thin layer of ice‐bonded sand. Wedge models suggest that if the base permafrost is dipping, it would intersect internal and free surface multiples of the seafloor and the top permafrost and be detected. Also, the amplitude ratio of the base permafrost reflection and the multiples decreases with the increasing thickness of permafrost. Therefore, the crosscutting relationship between the reflection at base permafrost reflection and the multiples might not be enough to detect the base permafrost for thicker permafrost layers. Finally, the experiment results show that, for partially ice‐bonded layers, the attenuation combined with the low reflectivity of the basal interface limits the likelihood to resolve the base permafrost, especially for thick permafrost layers. |
format |
Article in Journal/Newspaper |
author |
Duchesne, Mathieu J. Fabien‐Ouellet, Gabriel Bustamante, Jefferson |
spellingShingle |
Duchesne, Mathieu J. Fabien‐Ouellet, Gabriel Bustamante, Jefferson Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
author_facet |
Duchesne, Mathieu J. Fabien‐Ouellet, Gabriel Bustamante, Jefferson |
author_sort |
Duchesne, Mathieu J. |
title |
Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
title_short |
Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
title_full |
Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
title_fullStr |
Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
title_full_unstemmed |
Detecting subsea permafrost layers on marine seismic data: An appraisal from forward modelling |
title_sort |
detecting subsea permafrost layers on marine seismic data: an appraisal from forward modelling |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/nsg.12231 https://onlinelibrary.wiley.com/doi/pdf/10.1002/nsg.12231 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nsg.12231 |
genre |
Ice permafrost wedge* |
genre_facet |
Ice permafrost wedge* |
op_source |
Near Surface Geophysics volume 21, issue 1, page 3-20 ISSN 1569-4445 1873-0604 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/nsg.12231 |
container_title |
Near Surface Geophysics |
_version_ |
1810448954051002368 |