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Abstract: The thermal conductivity of hydrate-layer sediment recovered from a location near Japan was measured at temperatures ranging from 263-283 K, and at a pressure of 0.1 MPa. The thermal conductivity of Toyoura standard sand as a comparison. The thermal conductivity of the methane hydrate-bearing sediment was found to be lower than that of the standard sand at the same temperature. These samples were then measured at conditions similar to those below the seafloor. These conditions included a temperature of 278 K, a pressure of 10 MPa, and the samples were water saturated. The thermal conductivities were found to be significantly decreased up to a concentration of 40 vol. %, but at higher concentrations, the thermal conductivity remained constant.

Reference: Offshore Technology Conference, Houston, Texas, USA, 5-8 May, 2008.

DOI: 10.4043/19379-MS