Japan extracts gas from methane hydrate in world first
Production test Methane hydrate is also known as burnable or flammable ice
Japan says it has successfully extracted natural gas from frozen methane hydrate off its central coast, in a world first.
Methane hydrates, or clathrates, are a type of frozen "cage" of molecules of methane and water.
The gas field is about 50km away from Japan's main island, in the Nankai Trough.
Researchers say it could provide an alternative energy source for Japan which imports all its energy needs.
Other countries including Canada, the US and China have been looking into ways of exploiting methane hydrate deposits as well.
Pilot experiments in recent years, using methane hydrates found under land ice, have shown that methane can be extracted from the deposits.
Hydrates, or clathrates, are a frozen mixture of water and gas, primarily methane
The methane molecules reside inside a water molecule lattice
The methane will ignite in ice form - hence the "fire ice" moniker
Clathrates tend to form under frigid temperatures and high pressures
They are found in ocean sediments and under the permafrost on land
Vast deposits are thought to exist, rivalling known reserves of traditional fossil fuels
Offshore deposits present a potentially enormous source of methane but also some environmental concern, because the underwater geology containing them is unstable in many places.
"It is the world's first offshore experiment producing gas from methane hydrate," an official from the economy, trade and industry ministry told the AFP news agency.
A survey of the gas field is being run by state-owned Japan Oil, Gas and Metals National Corporation (JOGMEC).
Engineers used a depressurisation method that turns methane hydrate into methane gas.
Production tests are expected to continue for about two weeks.