Analysis on Sedimentary Facies of Member 7 in Yanchang Formation of Triassic in Ordos Basin

• 责任者：Yang Hua (Changqing Oilfield Company ; PetroChina ; Xi’an 710021 ; China) ; Dou Weitan
• 刊名：Acta Sedimentologica Sinica
• 出版年：2010
• 卷期：28(2)
• 关键词：沉积相模式 ; sedimentary facies model ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.254-263
• 图表：11 illus., 1 table, 8 refs.
• 分类号：1003
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

///In the depositional stage of member 7 of Yanchang Formation in Triassic, subsidence of the Mesozoic lake basin in Ordos Basin was the largest and the lake basin scope was extensive. It has been clarified that the source sediments were from five directions of basin circumference. The chief sources were located in the northeast and southwest areas and three secondary sources areas were located in the west, south and northwest. The sedimentary facies of member 7 of Yanchang Formation are the delta and lacustrine facies, which can be further sub-divided into five sub-facies and ten microfacies.