The Feixianguan Formation gas reservoir in east Sichuan Luojiazhai belongs to that of high sulfur.

四川东部罗家寨飞仙关组气藏属于高含硫气藏。

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The Suining Formation gas pools will(serve as) the key target of extended assessment and risk exploration of the shallow gas in the study area.

该大型岩性气藏的发现，说明川西地区浅层气仍然具有大的勘探前景，遂宁组气藏将是浅层扩展评价勘探和风险勘探的重要目标。

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The later usually raises the most concern and is perhaps the hardest goal to achieve when there is potential for formation gas to migrate into the cement sheath.

但层间封隔问题更引人注意，特别是当有气体侵入水泥环中的可能时更是难以达到预期目标。

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The enormous pressure of the shale formation sends oil and gas gushing out the well when it is first fracked.

FORBES: Will Natural Gas Stay Cheap Enough To Replace Coal And Lower US Carbon Emissions

The Marcellus Shale is an underground gas-rich formation extending across Pennsylvania, West Virginia, New York, Ohio and Maryland.

WSJ: Fed survey: Pa. shale gas boom regions robust

Ohio also has the Utica Shale, another formation rich in oil and gas.

WSJ: Fed survey: Pa. shale gas boom regions robust