And fracking has unleashed a flood of oil formerly trapped in shale rock underneath North Dakota, among other places.
液压破碎法将北达科他州及其他地区页岩下的石油大量开采出来。
Oil trap
原声例句
科学60秒 听力 2015年1月合集
经济学人 Business
It was conquered by wildcat frackers, who came up with clever ways of horizontal drilling and releasing oil trapped in the rock formations.
它被野猫压裂者征服了，他们想出了水平钻井和释放岩层中困油的巧妙方法。
英语百科
Petroleum reservoir
（重定向自Oil trap）
A petroleum reservoir or oil and gas reservoir is a subsurface pool of hydrocarbons contained in porous or fractured rock formations. Petroleum reservoirs are broadly classified as conventional and unconventional reservoirs. In case of conventional reservoirs, the naturally occurring hydrocarbons, such as crude oil or natural gas, are trapped by overlying rock formations with lower permeability. While in unconventional reservoirs the rocks have high porosity and low permeability which keeps the hydrocarbons trapped in place, therefore no need for any cap rock. Reservoirs are found using hydrocarbon exploration methods.
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