期刊
FLUID PHASE EQUILIBRIA
卷 413, 期 -, 页码 110-115出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2015.12.004
关键词
Methane hydrate; Marine sediments; Equilibrium decomposition condition
资金
- National Science Fund for Distinguished Young Scholars of China [51225603]
- National Natural Science Foundation of China [51476174, 51406210, 51276182]
- International S&T Cooperation Program of China [2015DFA61790]
- National Marine Geology Special program [GHZ2012006003]
Decomposition conditions of methane hydrate in marine sediments from South China Sea were measured using multi-step decomposition method. Four different samples of the marine sediments were used in the experiments. The pore distribution, the surface area, particle size and the surface texture were measured and observed. The experimental results indicated that the final decomposition temperatures are shifted lower than those for bulk hydrates at the same pressure for different marine sediments and different water saturations. Temperature shifts are more negative for smaller initial water saturation. The surface textures and pore of the sediments both affect the equilibrium condition of methane hydrate. Using the Clausius-Clapeyron equation, the enthalpy of hydrate dissociation in marine sediments was calculated. It was found that the enthalpy of hydrate dissociation in marine sediments with lower water saturation is higher than that at the bulk state. (C) 2015 Elsevier B.V. All rights reserved.
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