鄂尔多斯盆地演武地区延安组延10油层组沉积相研究

摘要

演武地区延10段是鄂尔多斯盆地延安组重要油层组之一,但对其沉积相的相关研究较为贫乏.结合整个鄂尔多斯盆地的构造及沉积演化特征,通过对演武地区延10段的岩石学特征、泥岩颜色、沉积构造等特征的综合研究,并结合沉积岩石学、层序地层学、岩相古地理等地质理论,认为演武地区延10油层组属于河流沉积体系,发育辫状河相,并进一步将其划分为河道砂坝、泛滥平原等两个沉积微相.根据延10段沉积微相的展布及演化规律,并结合其区域沉积和构造背景,建立了研究区延10油层组的沉积模式.%Yan 10 section of Yanwu area is one of the important reservoir group of Yanan Group of Ordos Basin,but the relative research on the sedimentary facies is poor.Combining the structure and sedimentary evolution characteristics of the whole Ordos basin,we have studied the characteristics of rocks mudstone color and sedimentary structure.With the sedimentary petrology,sequence stratigraphy,lithofacies palaeogeography and other geological theory,the author is considering that Yan 10 oil reservoir of Yanwu area belongs to fluvial depositional system.It is divided into two sedimentary microfacies:the core and the flood plain.According to the distribution and evolution of sedimentary microfacies in Yan 10 section,this paper combines with regional sedimentary and tectonic background to establish the sedimentary model of the 10 oil reservoir of the area.