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Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements

Authors :
Jiaxian Wang
Yunkai Ji
Changling Liu
Qingguo Meng
Yapeng Zhao
Zhun Zhang
Jianye Sun
Lele Liu
Fulong Ning
Source :
Journal of Marine Science and Engineering, Vol 12, Iss 4, p 619 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Understanding the conversion characteristics of pore water is crucial for investigating the mechanism of hydrate accumulation; however, research in this area remains limited. This study conducted methane hydrate formation experiments in unconsolidated sands using an in-house low-field nuclear magnetic resonance (NMR) system. It focused on pore water conversion characteristics and influencing factors such as initial water saturation and sand particle sizes. Results show that methane hydrate formation enhances the homogeneity of the effective pore structure within sand samples. The conversion rate of pore water is significantly influenced by differences in heat and mass transfer capacity, decreasing as initial water saturation and sand size increase. Pore water cannot be fully converted into hydrates in unconsolidated sands. The final conversion ratio of pore water in water-poor sand samples nears 97%, while in water-rich sand samples, it is only 65.80%. Sand particle size variation has a negligible impact on the final conversion ratio of pore water, with ratios exceeding 94% across different particle sizes, differing by less than 3%.

Details

Language :
English
ISSN :
20771312
Volume :
12
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Journal of Marine Science and Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.095c9f276d4482f960d9e36d5d77e5c
Document Type :
article
Full Text :
https://doi.org/10.3390/jmse12040619