The Shanbei oil pool in Jiuxi basin with sandstone reservoir beds of the Huoshaogou Formation of the Eogene, has long been taken as an example of hydrodynamically trapped oil pools.

酒西盆地单北油田下第三系火烧沟组砂岩油藏长期以来被认为是水动力圈闭油藏的范例。

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So that a large amount of low-mature oil was generated and subsequently migrated into sandstone belt with first secondary porosity created by the formation water released from clays.

这样，大量低成熟石油能够生成，并随着粘土释放出的层间水运移到砂岩的第一次生孔隙密集在中。

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A shale formation with sandstone interbedded is also a potential oil bearing formation.

以泥岩为主，夹砂岩的地层也可能是油气层。

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