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。
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。
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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