Recovery of Methane Intercalated in Natural Gas Hydrate Sediments Using a Carbon Dioxide and Flue Gas Mixture

摘要

Natural Gas Hydrate (NGH) can be converted into CO_2 hydrate by a ‘swapping mechanism’, serving double duty as a means of both sustainable energy source extraction and greenhouse gas sequestration. In particular, scant attention has been paid to the natural sediment clay portion in deep-sea gas hydrate, which is capable of storing a tremendous amount of NGH. The clay interlayer provides a unique chemical-physical environment for gas hydrates. Here, for the first time, we pull out methane from intercalated methane hydrates in a clay interlayer using CO_2 and a CO_2+N_2 gas mixture.