Seafloor breathing helping forecast hydrate-related geohazards

Gas hydrate dissociation may pose serious geohazards. The response of the seafloor to hydrate dissociation is important for geohazards, marine environments and global climate. We studied how hydrate dissociation affects underground temperature and pressure and how dissociation may lead to seafloor d...

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Autores principales:	Chaoqi Zhu, Zhenghui Li, Duanxin Chen, Sanzhong Li, Xiaoshuai Song, Hongxian Shan, Yonggang Jia
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Gas hydrate Geohazards Seafloor deformation Overpressure Inflation–deflation cycle Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/9aabd20793ac4236890c52e0c025c6ad
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id	oai:doaj.org-article:9aabd20793ac4236890c52e0c025c6ad
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spelling	oai:doaj.org-article:9aabd20793ac4236890c52e0c025c6ad2021-11-28T04:34:12ZSeafloor breathing helping forecast hydrate-related geohazards2352-484710.1016/j.egyr.2021.08.187https://doaj.org/article/9aabd20793ac4236890c52e0c025c6ad2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721007903https://doaj.org/toc/2352-4847Gas hydrate dissociation may pose serious geohazards. The response of the seafloor to hydrate dissociation is important for geohazards, marine environments and global climate. We studied how hydrate dissociation affects underground temperature and pressure and how dissociation may lead to seafloor deformation. Here, we designed a laboratory model experiment to visualize fluid migration and seafloor deformation during hydrate dissociation at atmospheric pressure. Our experiments show visible gas pipes, migratory gas and gas pockets due to hydrate dissociation and explain the newly discovered discordance between the slide plane and the base of the gas hydrate stability zone. We found that the underlying free gas and gas conduits not only are favorable factors for forming hydrates but also can be promoted by hydrate dissociation. The temperature, pressure, and seafloor deformation are collected during the experiments. Our results show that the hydrate dissociation process is an endothermic reaction. More importantly, hydrate dissociation-induced overpressure exhibits a sudden decrease after slow growth and this inflation–deflation cycle resembles breathing. In our experiments, seafloor deformation are dominated by underground overpressure and lags up to about ten minutes. This deformation pattern could help forecast seafloor subsidence based on deformation observations. Overpressure monitoring is effective and saves time to cope with imminent geohazards. This pattern is important for geologists and engineers to forecast hydrate-related geohazards.Chaoqi ZhuZhenghui LiDuanxin ChenSanzhong LiXiaoshuai SongHongxian ShanYonggang JiaElsevierarticleGas hydrateGeohazardsSeafloor deformationOverpressureInflation–deflation cycleElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8108-8114 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gas hydrate Geohazards Seafloor deformation Overpressure Inflation–deflation cycle Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Gas hydrate Geohazards Seafloor deformation Overpressure Inflation–deflation cycle Electrical engineering. Electronics. Nuclear engineering TK1-9971 Chaoqi Zhu Zhenghui Li Duanxin Chen Sanzhong Li Xiaoshuai Song Hongxian Shan Yonggang Jia Seafloor breathing helping forecast hydrate-related geohazards
description	Gas hydrate dissociation may pose serious geohazards. The response of the seafloor to hydrate dissociation is important for geohazards, marine environments and global climate. We studied how hydrate dissociation affects underground temperature and pressure and how dissociation may lead to seafloor deformation. Here, we designed a laboratory model experiment to visualize fluid migration and seafloor deformation during hydrate dissociation at atmospheric pressure. Our experiments show visible gas pipes, migratory gas and gas pockets due to hydrate dissociation and explain the newly discovered discordance between the slide plane and the base of the gas hydrate stability zone. We found that the underlying free gas and gas conduits not only are favorable factors for forming hydrates but also can be promoted by hydrate dissociation. The temperature, pressure, and seafloor deformation are collected during the experiments. Our results show that the hydrate dissociation process is an endothermic reaction. More importantly, hydrate dissociation-induced overpressure exhibits a sudden decrease after slow growth and this inflation–deflation cycle resembles breathing. In our experiments, seafloor deformation are dominated by underground overpressure and lags up to about ten minutes. This deformation pattern could help forecast seafloor subsidence based on deformation observations. Overpressure monitoring is effective and saves time to cope with imminent geohazards. This pattern is important for geologists and engineers to forecast hydrate-related geohazards.
format	article
author	Chaoqi Zhu Zhenghui Li Duanxin Chen Sanzhong Li Xiaoshuai Song Hongxian Shan Yonggang Jia
author_facet	Chaoqi Zhu Zhenghui Li Duanxin Chen Sanzhong Li Xiaoshuai Song Hongxian Shan Yonggang Jia
author_sort	Chaoqi Zhu
title	Seafloor breathing helping forecast hydrate-related geohazards
title_short	Seafloor breathing helping forecast hydrate-related geohazards
title_full	Seafloor breathing helping forecast hydrate-related geohazards
title_fullStr	Seafloor breathing helping forecast hydrate-related geohazards
title_full_unstemmed	Seafloor breathing helping forecast hydrate-related geohazards
title_sort	seafloor breathing helping forecast hydrate-related geohazards
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/9aabd20793ac4236890c52e0c025c6ad
work_keys_str_mv	AT chaoqizhu seafloorbreathinghelpingforecasthydraterelatedgeohazards AT zhenghuili seafloorbreathinghelpingforecasthydraterelatedgeohazards AT duanxinchen seafloorbreathinghelpingforecasthydraterelatedgeohazards AT sanzhongli seafloorbreathinghelpingforecasthydraterelatedgeohazards AT xiaoshuaisong seafloorbreathinghelpingforecasthydraterelatedgeohazards AT hongxianshan seafloorbreathinghelpingforecasthydraterelatedgeohazards AT yonggangjia seafloorbreathinghelpingforecasthydraterelatedgeohazards
_version_	1718408333095862272

Seafloor breathing helping forecast hydrate-related geohazards

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