Thermal Conductivity of Gas-Saturated Sediments during Gas Hydrate Formation at Negative and Positive Temperatures

摘要

The first evidence of anomalously low thermal conductivity in methane hydrate was obtained in 1979, and was supported and updated through later studies by different authors. Generally, thermal conductivities of pure monolith gas hydrates have been quite well documented today. According to experimental data, gas hydrates have their thermal conductivity (～0.6 W/m*K) about that of water (～0.6 W/m*K) and almost 4 times lower than in ice (～2.23 W/m*K) [Groysman, 1985; Wright et al. 2005; Bukhanov et al. 2008]. However, unlike pure gas hydrates, thermal conductivities of their sedimentary hosts remain quite poorly studied. The reason is that hydrate-bearing sediments have complex element and phase compositions and diverse macro- and microscopic structures.