Abstract
AbstractFor gas hydrate production, gas hydrate-bearing sediments should be depressurized below the gas hydrate equilibrium pressure. Gas hydrate-bearing sediments are compacted during the depressurization process because additional effective stress evolves due to a decrease in pore pressure. The compaction of a gas hydrate reservoir can lead to several geotechnical problems such as the destabilization of the production well, settlement of the seafloor installation, or slope failure of the production site. Thus, it is important to determine the compression characteristics of gas hydrate-bearing sediments and the geotechnical behavior of gas hydrate-bearing sediments during the gas hydrate dissociation induced by the depressurization. In this study, gas hydrates were synthesized in remolded sediment samples that were originally cored from a hydrate occurrence region in the Ulleung Basin, the East Sea, offshore Korea. The volumetric strain (or change of void ratio) of gas hydrate-bearing sediment samples were measured for different gas hydrate saturations and under different vertical effective stresses. The experimental results reveal the relation between compression (or the slope of a normal consolidation line) of gas hydrate-bearing sediments and gas hydrate saturation. Experimental data for compression indices of gas hydrate-bearing sediments can be applied to numerical modeling for a geotechnical stability analysis of gas hydrate-bearing sediments.
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