The main oil-bearing horizons of the No. 2 structural belt of the Nanpu subbasin are sandstone of the First Member of the Paleogene Dongying Formation and Ordovician limestone.
南堡凹陷南堡2号构造带主要含油层段为古近系东营组东一段砂岩及奥陶系灰岩。
And the main kind of them is the structural bed, which consists of litho group, litho formation and litho member in the classification system.
构造岩层是其中主要类别，其单位等级体制可划分为岩群、岩组与岩段。
The main difficulty in analysis of unbonded prestressed concrete beam bridge is the coupling between the sectional strength of member and the whole structural deformation of member.
分析无粘结预应力混凝土梁桥的主要困难，在于构件的截面强度和构件整体变形耦合。
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