鄂尔多斯南部镇原泾川地区延长组的沉积特征经过多年的资料积累和深入研究 ,发现在延长期沉积物主要来源于盆地西部的隆起 ,沉积相类型主要为正常的河流三角洲和湖泊沉积 ,岩石学特征表明 ,碎屑颗粒均为颗粒支撑 ,没有杂基支撑的结构类型 ,沉积构造组合也表明没有重力流的沉积特征。有利的储集砂体主要为河口砂坝砂体和分流河道砂体。 Sedimentary Characteristics of Yanchang Formation in Jingyuan Area, Southern Ordos Basin After years of data accumulation and in-depth study, it is found that the sediments in the extension period mainly originate from the uplift in the western part of the basin. The sedimentary facies are mainly normal delta and lacustrine sediments, and petrology The characteristics show that the clastic particles are all grain-supported and have no miscellaneous-supported structural type, and the sedimentary assemblage also shows no sedimentary features of gravity flow. The favorable reservoir sand bodies are mainly estuary sand bar bodies and distributary channel sand bodies.