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.
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”。
Nanpu depression volcanic rocks most beneficially reserviors develop in Beipu structural belt of Es3 period and Es1-3stage , secondly for the Nanpu No. 2 structural belt in Ng formation.
南堡凹陷火山岩最有利的勘探区带位于北堡构造带的沙3期和沙1-3期，其次为南堡2号构造带东营组。
Nanpu depression volcanic rocks most beneficially reserviors develop in Beipu structural belt of Es3 period and Es1-3stage , secondly for the Nanpu No. 2 structural belt in Ng formation.
南堡凹陷火山岩最有利的勘探区带位于北堡构造带的沙3期和沙1-3期，其次为南堡2号构造带东营组。
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