The answer: wells that drill vertically down to the shale bed, then make a gradual 90-degree horizontal turn through the shale deposit.

目前，科学家提出了解决方案——先垂直钻探至页岩床位置，然后以90度水平地钻探页岩沉积层。

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The fourth oil shale bed developed in lacustrine bog distributes unsteadily with small thickness. It is belong to the oil shale of middle ash and oil yield.

形成于湖沼相的油四层厚度较小，平面上分布不稳定，含油率较高，属中灰分中含油率的油页岩。

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Nor is shale gas the only new sort of reserve: "tight gas" in sandstones and coal-bed methane (the sort of gas that used to kill canaries down mines) are also promising.

不是只有页岩气是一种新的储备能源：在砂岩中的“致密地层天然气”还有在煤层里的甲烷(一种能在矿井里杀死金丝鸟的气体)也十分有前景。

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Unconventional sources of oil and gas that are set for further exploitation include Canada's tar sands, shale and coal-bed methane deposits around the world.

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"As we can see from the experience in the US, the exploration of shale gas and coal-bed methane has the potential to raise billions of pounds, resulting in reduced energy bills, " he said.

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The Energy Information Administration (EIA) puts it at around 37tcm of recoverable reserves, two-thirds of which is shale gas and the rest tight gas and coal-bed methane.

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