可能是储存它的池子太小，或与潜在的市场相距太远，因而钻井费用过高，不适宜开采。
It may be in a pool too small or too far from a potential market to justify the expense of drilling.
在原有的钻井技术中加入新方法后，天然气可以从离地表一英里甚至更深的未曾开发的柔软岩层中被开采出来。
Drillers have combined old technologies into new methods of extracting this natural gas from the previously untapped soft rock layer a mile or more beneath the surface.
实际上在十年前，美国所有的天然气开采公司，不是采用传统方式，就是利用垂直钻井开采。
Ten years ago virtually all of America's natural-gas production came from traditional gas or oil Wells reached by vertical drills.
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