Effect of salinity on the formation of methane hydrate in unconsolidated sediments

JI Yunkai; WANG Jiaxian; QIU Xiaoqian; MENG Qingguo; ZHANG Yongchao; HU Gaowei; CAI Feng; LIU Changling

doi:10.16562/j.cnki.0256-1492.2024090901

Marine Geology & Quaternary Geology > 2024 > 44(6): 71-81. > DOI: 10.16562/j.cnki.0256-1492.2024090901

JI Yunkai，WANG Jiaxian，QIU Xiaoqian，et al. Effect of salinity on the formation of methane hydrate in unconsolidated sediments[J]. Marine Geology & Quaternary Geology，2024，44(6)：71-81. DOI: 10.16562/j.cnki.0256-1492.2024090901

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Effect of salinity on the formation of methane hydrate in unconsolidated sediments

JI Yunkai^{1, 2,},
WANG Jiaxian^{1, 3},
QIU Xiaoqian^{1, 4},
MENG Qingguo^{1, 2},
ZHANG Yongchao^{1, 2},
HU Gaowei^{1, 2},
CAI Feng^{1, 2},
LIU Changling^{1, 2, ,}

1.
Key Laboratory of Gas Hydrate of Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
2.
Laboratory for Marine Mineral Resources, Qingdao Marine Science and Technology Center, Qingdao 266237, China
3.
Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
4.
School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China

More Information

Received Date: September 08, 2024
Revised Date: October 12, 2024

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Abstract

Abstract

In-depth understanding of the characteristics of methane hydrate formation in unconsolidated sediments containing saline solution is of great significance for the accurate evaluation of hydrate resources in marine sediments. In this study, the effect of salinity on the formation characteristics of methane hydrate in unconsolidated sand samples was studied using the low-field nuclear magnetic resonance in-situ detection technology. Results show that there were differences in the induction time of hydrate formation in pores of different sizes in the unconsolidated sands; methane hydrate was more likely to form in small pores. As the salinity of pore water increased, the induction time of hydrate formation increased exponentially. In the first 20 minutes, the hydrate formation rate first increased and then decreased, and the formation rate was the highest under the salinity of 3.0 wt%. At different locations of the unconsolidated sediments, the difference in the induction time of methane hydrate formation and the mode change of water through the hydrate film caused changes in the hydrate formation rate. The large potential energy on sediment surface and the barrier effect caused by the presence of hydrates prevented some pore water in the samples from being converted into hydrates. The increase in the initial salinity of pore water could enhance the barrier effect, decrease the final conversion rate of pore water, and reduce the hydrate saturation.
- hydrate formation,
- unconsolidated sediment,
- low-field nuclear magnetic resonance (LF-NMR),
- salinity

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References (44)

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