根据组与火山-沉积复合岩相或沉积岩相相对应的原则，各群又可进一步划分为若干个组。
These groups can be further divided into formations according to the principle that formation is related to volcanic sedimentary lithofacies or sedimentary lithofacies.
着重分析了西北缘的沉积岩相分布特征和规律，研究了西北缘沉积相展布的控制因素以及沉积相和油气分布的关系。
It emphasized on the distribution and laws of sedimentary facies, the controlling factors of facial distribution and relations between oil and sedimentary facies.
各类软弱夹层的物理力学性质具有其独特的规律性。软弱夹层的类型受沉积岩相的严格控制，在岩相研究的基础上可以进行工程地质类比。
The physical and mechanical nature has its own law in each type of weak interlayers, the types of weak interlayers could be determined by the research on sedimentary facies.
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