内陆表海含煤盆地层序地层分析的思路和方法

THE THOUGHT AND METHOD OF SEQUENCE STRATIGRAPHIC ANALYSIS IN EPICONTINENTALCOAL-BEARING BASIN

李增学 李守春 魏久传

Li Zengxue Li Shouchun Wei Jiuehuan

内陆表海含煤盆地的层序地层分析不同于大陆边缘海盆地,尤其像华北晚古生代巨大的内陆表海聚煤盆地,海平面变化具突发性和高频性特点,因此所形成的海陆交替里含煤层序较其他类型盆地成因的层序要薄得多。根据研究区盆地充填特征,海平面变化对沉积体系类型和空间配置的控制,总结出内陆表海盆地层序地层分析的基本思路和方法,即Ⅲ级层序划分与层序内部构成单元划分同步进行,最大海泛面的识别与层序界面、小层序界面以及沉积体系域的识别同步进行等原则。

The sequence stratigraphic analysis of epicontinental coal-bearing basin differs from thatof continental margin basin. In the vast epicontinental coal basin of the Late Paleozoic inNorth China, the sea level changed suddenly and frequently, the paralic coal measuresformed in this condition is thinner than the sequence of marginal sea basin. Based on thebasin-filling characteristics, the control of sea level change over the types and spatial distribution of depositional systems, the basic thought and method of sequence stratigraphic analysis of epicontinental basin have been proposed as fallows:the classification of third order sequence and the intrasequence structural units could be taken at the same time; the recognition of maximun marine flooding surface,sequence interfaces,subsequence interface and depositional system tract could be taken at the same time

10.11743/ogg19960101