Abstract
Natural gas hydrates are globally considered a potential alternative form of energy suitable for sustainable development. The microstructure of natural gas hydrates in sediments governs their seismic and acoustic exploration, stability of seafloors, and gas production from hydrate deposits. To investigate the microstructure and occurrence of natural gas hydrates in pores, natural gas hydrate-bearing porous media were directly observed using microfocus X-ray computed tomography (CT). The spatial distributions of free gas, natural gas hydrates, water, and grains were identified. The results indicated the preference of natural gas hydrates to form primarily within pore spaces and not to cement the adjacent grains, which was described by the floating model. Moreover, the migration of gas and water within pore spaces during hydrate formation appeared random, and natural gas hydrates were found to nucleate preferentially at the gas–water interface. The values of porosity and hydrate saturation obtained via reco...
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