Patent ID: 8684085

Claim:
An apparatus for storing a substance-to-be-stored underground, comprising: an injection well extending to a brine aquifer; a pumping apparatus for pumping to the injection well a substance-to-be-stored which includes at least one of carbon dioxide, acetylene, ammonia, sulfur dioxide, hydrogen chloride, chlorine, hydrogen sulfide, and methane; and a porous member provided in the vicinity of a tip of the injection well, wherein the substance-to-be-stored pumped into the injection well can be injected into the brine aquifer via the porous member, the substance-to-be-stored which is injected from the porous member into the brine aquifer is in a supercritical state, in the course of injection of the substance-to-be-stored from the porous member into the brine aquifer, microbubbles of the substance-to-be-stored are generated, and the porous member is formed through firing of a mixture of ceramic particles and a binder for binding the ceramic particles together, a mode of a pore size distribution is 40 Î¼m or less, and a full width at half maximum of the pore size distribution is 10 Î¼m or less.