The Shahejie Formation of the 5th structure in Napu sag is buried deeply.

摘要南堡凹陷5号构造沙河街组地层埋藏深度较大，由火山岩与沉积岩构成地层骨架。

In lamina of shale which deposited in deep lake away from paleo-debouchment in the Shahejie Formation in the Jiyang Depression, some aeolian silty sand was discovered.

该油页岩呈深灰色或棕褐色 ,页理发育 ,主要由富含有机质纹层和浅灰色钙质纹层形成的毫米级沉积层偶组成。