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层序是层序地层学中的一个基本地层单元。一般说来,虽然单个的准层序在地震剖面上不能分辨,但是根据准层序的地层模型特征,叠置的准层序组是可以分辨的。研究测井资料的地质学家在单个准层序的识别、其垂向和横向上的相关系以及它们的叠置方式的基础上,作出了许多解释。因而,准层序在识别层序和解释层序的沉积和构造演化史中具有重要的意义。
Sequence is a basic stratigraphic unit in sequence stratigraphy. In general, although a single quasi-sequence can not be resolved in the seismic profile, the quasi-sequence sets are distinguishable according to the characteristics of the quasi-sequence stratigraphic model. Geologists studying log data have made many explanations based on the recognition of a single quasi-sequence, their vertical and horizontal correlation, and their stacking patterns. Therefore, quasi-sequence is of great importance in the identification of sequences and the interpretation of the sequence of sedimentary and tectonic evolution.