The Arctic is reckoned to hold around 15% of the world's undiscovered oil reserves and 30% of those of natural gas.

北极被估计保有全球石油储量的15%以及天然气储量的30%。

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The U.S. Geological Survey estimates the Arctic has as much as 25 per cent of the world\'s undiscovered oil and gas.

美国地质勘测局估计，北极地区蕴含着多达25%的世界上未发现的石油和天然气。

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He and his team had explored for undiscovered oil in horizontal shales deep within the Permian Basin, a vast rock formation beneath West Texas.

他和他的团队勘探到了二叠盆地未探明的水平页岩油，这些地层主要分布在西德克·萨斯盆地。

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In all, the Arctic may hold 20-30% of the world's undiscovered oil reserves.

ECONOMIST: A meltdown tinged with acid

An oft-quoted figure that the region contains 25% of the world's undiscovered oil and gas is generally attributed to America's Geological Survey.

ECONOMIST: The Arctic

The U.S. Geological Survey estimated in 2008 that some 22% of the world's undiscovered oil and natural-gas deposits are located above the Arctic Circle.

WSJ: Arctic Body Weighs China's Bid to Observe