Earlier in the year, a report from the National Research Council identified the combustible water, also known as methane hydrate, as a potential source of natural gas.

在今年的早些时候，美国国家研究委员会就提出过一份报告，论证这种可以燃烧的水，也可称作甲烷水化物，是一种天然气的潜在来源。

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Permo Carboniferous coal series have relative good coal gas potential, dark mudstones in lower Jurassic, lower part of Middle Jurassic and lower Cretaceous are the best source rocks.

区内石炭—二叠纪煤系具有良好的煤型气及一定的煤层气潜力，中、下侏罗统和下白垩统暗色泥岩类是最具生油潜力的烃源岩系。

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According to the studies at home and abroad, the reserve of deep source gas is very large in the world and the deep gas potential in China is large, too.

据国内外研究，世界上深源气资源量很大，我国深源气的潜力也很大。

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But since the break-up of the Soviet Union, it's been eyeing a potential new source of oil and gas -- the Caspian Sea.

BBC: Oil flows from the Caspian Sea

For Europe, it is an important potential source of non-Russian gas.

ECONOMIST: A small country grows drunk on oil wealth