Experimental study on the cold-seep methane hydrate formation kinetics

被引:2
作者
Zhang, Yitong [1 ,2 ,4 ]
Du, Zengfeng [1 ,2 ,4 ]
Xi, Shichuan [3 ]
Ma, Liang [1 ,2 ,4 ]
Luan, Zhendong [1 ,2 ,4 ]
Zhang, Xin [1 ,2 ,3 ,4 ]
机构
[1] Chinese Acad Sci, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
[2] Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
[3] LaoShan Lab, Qingdao 266237, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Hydrate formation kinetics; Hydrate nucleation; Confocal micro-Raman spectroscopy; Cold-seep fluids; IN-SITU RAMAN; GAS; NUCLEATION; SEA; DECOMPOSITION; SIMULATIONS; MECHANISMS; INSIGHTS;
D O I
10.1016/j.ces.2024.120144
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Cold-seep methane hydrates are widespread in the natural environment. A comprehensive understanding of the cold-seep methane hydrate formation kinetics is crucial for the knowledge of formation mechanisms and the development and utilization of natural gas hydrate. This study monitored the kinetics of methane hydrate formation in cold-seep fluids using continuous time-series Raman spectroscopy. A novel spectroscopic method was proposed to accurately determine the nucleation time of gas hydrates with a ten-second accuracy. Experimental results showed a smooth transition from dissolved methane to hydrated methane. Rapid hydrate nucleation and growth initiation were observed at the gas-liquid interface, forming hydrate films wrapping gas bubbles and suspending hydrate microcrystals in cold-seep fluids. Furthermore, a model for cold-seep methane hydrate formation kinetics was proposed, which indicated three distinct stages including an induction period, a metastable nucleation period, and a stable growth period.
引用
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页数:8
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