Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales
Methane hydrates (MHs) are considered an alternative energy resource but also a potential source of geo-hazards and climate change. The physical/mechanical properties of gas hydrate-bearing sandy sediments are strongly dependent on the distribution of hydrates within the pore space. The purpose of t...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2024-01-01
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| Series: | Science and Technology for Energy Transition |
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| Online Access: | https://www.stet-review.org/articles/stet/full_html/2024/01/stet20230068/stet20230068.html |
| _version_ | 1797248854127542272 |
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| author | Le Thi Xiu Bornert Michel Aimedieu Patrick Broseta Daniel Chabot Baptiste King Andrew Tang Anh Minh |
| author_facet | Le Thi Xiu Bornert Michel Aimedieu Patrick Broseta Daniel Chabot Baptiste King Andrew Tang Anh Minh |
| author_sort | Le Thi Xiu |
| collection | DOAJ |
| description | Methane hydrates (MHs) are considered an alternative energy resource but also a potential source of geo-hazards and climate change. The physical/mechanical properties of gas hydrate-bearing sandy sediments are strongly dependent on the distribution of hydrates within the pore space. The purpose of this study is to investigate morphologies and pore-habits of MHs formed in sandy sediments by means of experiments that probe a wide range of scales, from the pore scale – using Synchrotron X-Ray Computed Tomography (SXRCT) and optical microscopy – to the core scale, through mechanical property measurements. The same synthetic sands are used, in which MHs are generated successively under excess gas and excess water conditions. At the macroscopic (core) scale, MH pore habits are inferred by comparing the measured sonic wave velocities to velocities calculated from rock physics models and further assessed via triaxial compression tests. Furthermore, Magnetic Resonance Imaging is used to investigate the kinetics of MH formation and distribution along the core height. The pore habits and MH morphologies are directly visualized at the pore (grain) scale by SXRCT and, with still better spatial and temporal resolution, by transmission optical microscopy, revealing some more complex morphologies than in the hydrate pore habits commonly admitted. |
| first_indexed | 2024-04-24T20:21:12Z |
| format | Article |
| id | doaj.art-fc01f3c6829b45bcbb73846063ce5ff7 |
| institution | Directory Open Access Journal |
| issn | 2804-7699 |
| language | English |
| last_indexed | 2024-04-24T20:21:12Z |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Science and Technology for Energy Transition |
| spelling | doaj.art-fc01f3c6829b45bcbb73846063ce5ff72024-03-22T08:09:53ZengEDP SciencesScience and Technology for Energy Transition2804-76992024-01-01791410.2516/stet/2024012stet20230068Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scalesLe Thi Xiu0Bornert Michel1Aimedieu Patrick2Broseta Daniel3Chabot Baptiste4King Andrew5Tang Anh Minh6https://orcid.org/0000-0002-7149-8497Laboratoire Navier, Ecole des Ponts, Univ Gustave Eiffel, CNRSLaboratoire Navier, Ecole des Ponts, Univ Gustave Eiffel, CNRSLaboratoire Navier, Ecole des Ponts, Univ Gustave Eiffel, CNRSUniversité de Pau et des Pays de l’Adour, E2S UPPA, CNRS, LFCRLaboratoire Navier, Ecole des Ponts, Univ Gustave Eiffel, CNRSSynchrotron SOLEIL, L'Orme des Merisiers Départementale 128Laboratoire Navier, Ecole des Ponts, Univ Gustave Eiffel, CNRSMethane hydrates (MHs) are considered an alternative energy resource but also a potential source of geo-hazards and climate change. The physical/mechanical properties of gas hydrate-bearing sandy sediments are strongly dependent on the distribution of hydrates within the pore space. The purpose of this study is to investigate morphologies and pore-habits of MHs formed in sandy sediments by means of experiments that probe a wide range of scales, from the pore scale – using Synchrotron X-Ray Computed Tomography (SXRCT) and optical microscopy – to the core scale, through mechanical property measurements. The same synthetic sands are used, in which MHs are generated successively under excess gas and excess water conditions. At the macroscopic (core) scale, MH pore habits are inferred by comparing the measured sonic wave velocities to velocities calculated from rock physics models and further assessed via triaxial compression tests. Furthermore, Magnetic Resonance Imaging is used to investigate the kinetics of MH formation and distribution along the core height. The pore habits and MH morphologies are directly visualized at the pore (grain) scale by SXRCT and, with still better spatial and temporal resolution, by transmission optical microscopy, revealing some more complex morphologies than in the hydrate pore habits commonly admitted.https://www.stet-review.org/articles/stet/full_html/2024/01/stet20230068/stet20230068.htmlgas hydratessedimentmicrostructuremechanical properties |
| spellingShingle | Le Thi Xiu Bornert Michel Aimedieu Patrick Broseta Daniel Chabot Baptiste King Andrew Tang Anh Minh Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales Science and Technology for Energy Transition gas hydrates sediment microstructure mechanical properties |
| title | Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales |
| title_full | Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales |
| title_fullStr | Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales |
| title_full_unstemmed | Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales |
| title_short | Mechanical behaviour and microstructure of methane hydrate-bearing sandy sediment observed at various spatial scales |
| title_sort | mechanical behaviour and microstructure of methane hydrate bearing sandy sediment observed at various spatial scales |
| topic | gas hydrates sediment microstructure mechanical properties |
| url | https://www.stet-review.org/articles/stet/full_html/2024/01/stet20230068/stet20230068.html |
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