A gas hydrate is produced by microparticulating a liquid guest molecule into a microparticle smaller than a narrow space in the strata, dispersing the microparticle in water to give an emulsion, and injecting the emulsion into the narrow space under such temperature/pressure conditions that the guest molecule can be converted into a hydrate, thereby dispersing the guest molecule uniformly in the narrow space in the strata and forming a gas hydrate.
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