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Abstract: This conference paper describes extensive investigations performed on sediment cores containing methane hydrates recovered from beneath the sea floor. Great care was taken to perform thermal conductivity measurements using the Hot Disk TPS at similar temperature and pressure to the natural conditions that these hydrates develop and are deposited in. Measurements were taken with the samples under both water saturated and gas saturated conditions. Thermal conductivity values obtained from both conditions at temperatures over the melting point of ice were similar to each other. The thermal conductivity of the hydrates decreased as the temperature approached the melting point, and continued to drop in sub zero measurement conditions. The researchers concluded that most of the pore space around the hydrates must already be filled with water.

Reference: International Society of Offshore and Polar Engineers: The Fifteenth International Offshore and Polar Engineering Conference, (2005) 19-24 June, Seoul, Korea