HR: 1340h
AN: OS23A-1065    [Abstracts]
TI: Exploitation of methane hydrate using exothermic heat of CO2 hydrate formation - Verification for performance of CO2 as warming material for marine sediments -
AU: * Ikegawa, Y
EM: ikegawa@criepi.denken.or.jp
AF: CRIEPI, 1646 abiko, Chiba prefecture, Abiko, 270-1194, Japan
AB: Methane hydrate is found in marine sediments and permafrost. But methane hydrate is solid and it doesnft flow. Then some dissociation methods of methane hydrate are proposed such as heating and depressurization. If carbon dioxide (CO2) can be used for dissolving methane hydrate in marine sediments, we could obtain natural gases with less impact for the global warming. Thus we focus on exothermic heat of CO2 hydrate formation to warm marine sediments. Then we proposed an injection method to disperse CO2 homogeneously into the sediments using CO2/water emulsion for controlling quantity of heat per unit volume. Using the emulsion, the performance of CO2 as warming material was about 9 degree centigrade to rise the temperature of marine sediments by a laboratory test and its numerical estimation. This performance of CO2 is effective to dissolve methane hydrate in marine sediments.
DE: 0428 Carbon cycling (4806)
DE: 3004 Gas and hydrate systems
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting