| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Sediment damage caused by gas exsolution: a key mechanism for mud volcano formation
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| Autores: |
Blouin, Arthur
Sultan, Nabil
Callot, Jean-paul
Imbert, Patrice
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| Data: |
2019-12
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| Ano: |
2019
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| Palavras-chave: |
Consolidation testing
Gas exsolution
Gassy sediments
Sediment damage
Mud volcano
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| Resumo: |
Gassy sediments are common in marine environments and are characterized by a specific mechanical behavior significantly different from that of water-saturated sediments. It is shown that gas causes damage and initiates fractures in sediments. To define the controlling parameters dominating the damage process during gas exsolution and its consequences in terms of hydro-mechanical behavior, we developed a specific consolidation apparatus to test sediments collected from the active Absheron Mud Volcano. Indeed, mud volcano formation is initiated by gas exsolution and subsequent mud generation at depth from stratified sediments. Gas was generated in the samples by circulating carbonated water through the fine-grained sediments, then decreasing the total pressure. Particular attention was given to the impact of gas saturation and associated damage and fractures on P-wave velocity, sediment compressibility, permeability and preconsolidation pressure. Results show that fracture geometry is mainly controlled by the degree of gas saturation and preconsolidation pressure. The damage level increases with the degree of gas saturation while the elastic modulus of sediments is degraded. Experimental data show that sediments do not entirely recover their original mechanical behavior when gas dissipates. Finally, the experimental data confirm that gas exsolution and expansion is a key mechanism for mud generation.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00588/70043/67974.pdf
DOI:10.1016/j.enggeo.2019.105313
https://archimer.ifremer.fr/doc/00588/70043/
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| Editor: |
Elsevier BV
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| Formato: |
application/pdf
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| Fonte: |
Engineering Geology (0013-7952) (Elsevier BV), 2019-12 , Vol. 263 , P. 105313 (18p.)
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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