Methane hydrate formation in Black Sea sediments: ionic strength and confinement effect.
Natural gas hydrates (NGH) are crystalline materials in which water molecules form networks where gas molecules are trapped. These NGH have a very large gas storage capacity and have been studied for many years in various fields, both in geosciences and astrophysics and in process engineering. Methane NGH are found in marine sediments on continental margins. Only few studies focus on the plausible formation of NGH in sediment nanopores, especially by considering natural sediments present in deep-ocean (Black sea) and geological materials mimicking the natural ones. Hydrate formation in confined spaces is a required knowledge for understanding the formation history and formation mechanism of NGH, crucial to evaluate NGH destabilization and potential impact on climate change. This proposal aims at investigating the methane hydrate formation within sediments (artificial and natural clay/silica matrix) at various salt concentrations. The effect of ionic strength (salinity) and confinement properties (multiscale pores distribution in sediments) on methane hydrates formation will be explored via inelastic neutron scattering under conditions reproducing their Black Sea natural environment
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GUIMPIER Charlene; AGNISSAN Art Clarie Constant; DESMEDT Arnaud; JIMENEZ RUIZ Monica; METAIS Cyrielle; MICHOT Laurent and RUFFINE Livio. (2021). Methane hydrate formation in Black Sea sediments: ionic strength and confinement effect.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-528
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