Stability Condition of Methane Hydrate in Fine-Grained Sediment
Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities ( <math xmlns="http://www.w3.org/1998/Math/MathML" display=...
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ftdoajarticles:oai:doaj.org/article:f0cb323f1735419cb3b2c107bcc38060 2023-05-15T17:11:08+02:00 Stability Condition of Methane Hydrate in Fine-Grained Sediment Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao 2023-01-01T00:00:00Z https://doi.org/10.3390/jmse11010196 https://doaj.org/article/f0cb323f1735419cb3b2c107bcc38060 EN eng MDPI AG https://www.mdpi.com/2077-1312/11/1/196 https://doaj.org/toc/2077-1312 doi:10.3390/jmse11010196 2077-1312 https://doaj.org/article/f0cb323f1735419cb3b2c107bcc38060 Journal of Marine Science and Engineering, Vol 11, Iss 196, p 196 (2023) fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 article 2023 ftdoajarticles https://doi.org/10.3390/jmse11010196 2023-01-22T01:27:20Z Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities ( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ρ</mi><mi>d</mi></msub></mrow></semantics></math> = 1.40, 1.50 and 1.60 g/cm 3 ) and various initial water saturations by the multi-step heating method. The experimental result showed that the methane hydrate formation in fine-grained sediment required lower temperature and/or higher pressure compared to that in bulk state. At the same time, it is found that the deviation degree of P–T conditions of methane hydrate in fine-grained sediment with different dry density and initial water saturation are completely different from that in pure water. In addition, according to the nuclear magnetic resonance technique (NMR), the changes in NMR signal intensity during the formation and decomposition of methane hydrate in silt were analyzed. Regardless of formation and dissociation stages, liquid water always distributes in the small sediment pores. An empirical formula is developed to address the capillary suction of water and hydrate with respect to the unhydrated water within sediment. Furthermore, a phase equilibrium model is proposed to predict the stability conditions of hydrate-bearing fine-grained sediment. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Journal of Marine Science and Engineering 11 1 196 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 |
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fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao Stability Condition of Methane Hydrate in Fine-Grained Sediment |
topic_facet |
fine-grained sediment methane hydrate stability conditions nuclear magnetic resonance phase equilibrium model Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 |
description |
Stability condition is of critical importance for methane hydrate exploitation, transportation, and reserves. This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities ( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>ρ</mi><mi>d</mi></msub></mrow></semantics></math> = 1.40, 1.50 and 1.60 g/cm 3 ) and various initial water saturations by the multi-step heating method. The experimental result showed that the methane hydrate formation in fine-grained sediment required lower temperature and/or higher pressure compared to that in bulk state. At the same time, it is found that the deviation degree of P–T conditions of methane hydrate in fine-grained sediment with different dry density and initial water saturation are completely different from that in pure water. In addition, according to the nuclear magnetic resonance technique (NMR), the changes in NMR signal intensity during the formation and decomposition of methane hydrate in silt were analyzed. Regardless of formation and dissociation stages, liquid water always distributes in the small sediment pores. An empirical formula is developed to address the capillary suction of water and hydrate with respect to the unhydrated water within sediment. Furthermore, a phase equilibrium model is proposed to predict the stability conditions of hydrate-bearing fine-grained sediment. |
format |
Article in Journal/Newspaper |
author |
Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao |
author_facet |
Di Lu Qin Tang Dehuan Yang Rongtao Yan Yun Chen Shuai Tao |
author_sort |
Di Lu |
title |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_short |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_full |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_fullStr |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_full_unstemmed |
Stability Condition of Methane Hydrate in Fine-Grained Sediment |
title_sort |
stability condition of methane hydrate in fine-grained sediment |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/jmse11010196 https://doaj.org/article/f0cb323f1735419cb3b2c107bcc38060 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Journal of Marine Science and Engineering, Vol 11, Iss 196, p 196 (2023) |
op_relation |
https://www.mdpi.com/2077-1312/11/1/196 https://doaj.org/toc/2077-1312 doi:10.3390/jmse11010196 2077-1312 https://doaj.org/article/f0cb323f1735419cb3b2c107bcc38060 |
op_doi |
https://doi.org/10.3390/jmse11010196 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
11 |
container_issue |
1 |
container_start_page |
196 |
_version_ |
1766067980285771776 |