摘要
冯地坑-洪德地区长7是鄂尔多斯盆地延长组重要油层组之一,但一直以来对其沉积相研究程度较低。结合整个鄂尔多斯盆地的构造及沉积演化特征,对其岩石类型、砂岩的岩石结构、沉积构造、古生物及测井相等进行详细研究,具体分析了其沉积相类型和特征,并建立长7油层组沉积模式。研究表明,冯地坑-洪德地区长7沉积时期发育了一套曲流河三角洲和湖泊沉积体系,曲流河三角洲发育三角洲前缘和前三角洲2种亚相,湖泊相发育浅湖亚相;研究区三角洲前缘砂体以细砂-粉砂为主,发育有水下分支河道、水下天然堤、支流间湾、河口砂坝和前缘席状砂5种微相。
The Chang-7 of Fengdikeng-Hongde Area was one of the important oil groups in Yanchang Formation of Ordos basin,but the study on sedimentary facies always keeped a low level. Based on the tectonic and sedimentary evolution of Ordos Basin,rock types,sandstone structure,sedimentary tectonics,paleontologic evidence and electrofacies of the Chang-7 oil group were studied in detail. The types and characteristics of sedimentary facies of Chang-7 oil group were analyzed concretely,and the sedimentary model were built. The result shows that there exist a set of meandering river delta and lacustrine sedimentary systems. The meandering river delta facies develops two subfacies as delta front and prodelta,and lacustrine facies develops shallow lake subfacies. Delta front develops five microfacies as subaqueous distributary channel,subaqueous natural levee,interdistributary bay,channel mouth bar and frontal sheet sand,among which the sand body is mainly packsand and siltstone.
出处
《长江大学学报（自科版）（上旬）》
CAS
2010年第2期28-31,共4页
JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG
