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为了明确鄂尔多斯南缘平凉期沉积相类型及展布情况,在对研究区野外剖面实地踏勘的基础上,对不同的岩石类型、沉积构造及生物组合进行研究,总结归纳出了鄂尔多斯南缘平凉期的沉积相类型,主要有开阔海台地相、台地边缘滩礁相、台地前缘斜坡相、以及深水斜坡—海槽相。在次基础上,绘制了平凉期鄂尔多斯南缘的沉积相分布图,确定了各个相带的空间展布范围。总结了研究区的沉积相模式,并分析了形成这种格局的沉积演化背景,为下一步的天然气勘探提供了一定的依据。
In order to clarify the type and distribution of sedimentary facies during the Pingliang Period in the southern margin of Ordos, based on the field reconnaissance in the field profile of the study area, the different rock types, sedimentary structures and biological assemblages were studied, and the Pingliang period The types of sedimentary facies include the open sea facies facies, the platform margin margins and facies facies, the foreland slope facies, and the deep-water slope-trough facies. On the basis of this, the sedimentary facies distribution maps of the southern margin of Ordos in Pingliang were plotted, and the spatial distribution range of each facies band was determined. This paper summarizes the sedimentary facies model of the study area and analyzes the background of sedimentary evolution that formed this pattern, which provides a basis for the next gas exploration.