结合岩心观察和测井资料,针对鄂尔多斯盆地的环县西部地区延10—延8段进行沉积特征研究.研究结果表明:延10段的沉积相为辫状河沉积,存在河道、堤泛2种亚相,发育心滩、河床滞留沉积及河漫滩、河漫沼泽等4种微相;延9、延8段沉积相为三角洲沉积,发育三角洲平原亚相,以及分流河道、天然堤、决口扇、分流间洼地和泥炭沼泽等5种微相;受沉积相带控制,延10—延8段砂体大致呈南西—北东向展布,沉积砂体厚度为5～20 m.
Study on the Sedimentary Characteristics of Yan10-Yan8 Section in the Western Area of Huanxian County
Based on core observation and well logging data, the sedimentary characteristics of Yan10-Yan8 section in Western area of Huanxian county in Ordos basin are studied. The results show that the sedimentary facies of Yan 10 section is braided river sediment, with 2 subfacies of channel and embankment, and 4 microfacies, namely, devel-oping core beach, river bed retention deposit, river flooding beach and river flooding swamp. The sedimentary faci-es of Yan9 and Yan8 are delta sediments, with delta plain subfacies and 5 microfacies, such as distributary chan-nel, natural dike, breakout fan, inter-distributary depression and peat bog. Controlled by the sedimentary facies belt, the sand bodies of Yan10-Yan8 are generally distributed in the direction of Southwest to Northeast, and the thickness of the sedimentary sand bodies is 5～20 m.
Ordos basinWestern area of HuanxianYan'an formationsedimentary faciessedimentary characteristics
万方数据
