The oil shale of Wulidui Formation in the Wucheng Basin, Tongbai occurs as brown-black, thin and soft slices with an average oil yield up to 6.

桐柏吴城盆地五里堆组油页岩为棕黑色，质细而软，呈薄片状产出，平均含油率为6。

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According to the industrial division criterion of the oil shale, the oil shales of the Dalianhe Formation belonged to the middle oil yield with low-ash.

根据油页岩工业划分标准，达连河油页岩属于中灰分、低含油率的油页岩。

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The oil shale mainly occurs in the Eocene-Oligocene Youganwo Formation.

油页岩主要赋存于始新渐新统油柑窝组。

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At issue now is the Monterey Shale, a formation holding more shale oil than anywhere else in the country.

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

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The dramatic migration pattern can be chalked up to the rapid development of an oil- and gas-rich shale formation in the western part of the state.

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