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。
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.
歧口凹陷古近系沙河街组一段广泛发育颗石灰岩与泥岩的纹层状互层，因其含油而被误认为“油页岩”。
In the Es1 Formation in Qikou Sag, the interlaminated coccolith limestone and mudstone develops extensively, in some literature, it is classified as "oil shale" because of the oil bearing.
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。
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.
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