Analysis of High-Resolution Sequence Stratigraphy in Chang-8 Subsection of Yanchang Formation, Jiyuan Area of Ordos Basin

• 责任者：Liao Yi (State Key Laboratory for Oil and Gas Deposit Geology and Development Project ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Zheng Rongcai
• 刊名：Acta Sedimentologica Sinica
• 出版年：2010
• 卷期：28(3)
• 关键词：三角洲沉积作用 ; deltaic sedimentation ; 高分辨率层序地层学 ; high resolution sequence stratigraphy ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.481-488
• 图表：8 illus., 15 refs.
• 分类号：0803
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

With the theory of high-resolution sequence stratigraphy, the base-level cycles in Chang-8 oil set of Yanchang Formation in Jiyuan area of Ordos Basin are recognized as 2 middle-term cyclic sequences (MSC1 and MSC2) and 6 short-term cyclic sequences (ssc1-ssc6) and the sedimentary environment is a shallow-water delta by utilizing the data of well logging, core and rock and mineral analysis. The results indicate that the delta front and predelta of expanded lake developed in Chang-82 and delta plain appeared in Chang-81 of Jiyuan area. The relationship among the cyclic stacking pattern of various grade of base-level and the distribution and evolution of sedimentary facies are analyzed and the delta of Jiyuan area is compared with the normal delta. A high-resolution sequence stratigraphic framework and stratigraphic-lithofacies palaeogeographic maps of Chang-81 and Chang-82 are established by taking the short-term cyclic sequence as unit.