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Natural Gas Hydrate Occurrence and Issues

Naturally occurring gas hydrate is a solid, icelike substance composed of rigid cages of water molecules that enclose molecules of gas, mainly methane. Chemically, this substance is a water clathrate of methane, often called methane clathrate, but the term methane hydrate or gas hydrate is most commonly used to describe these extensive deposits of solidified water and methane. The maximum amount of methane that can occur in a methane hydrate is fixed by the clathrate geometry. In an ideally saturated methane hydrate, the molar ratio of methane to water is 15.75, that is, equal to a volumetric ratio at standard conditions of 164:l.I