【摘要】 综合利用岩心、钻井、测井以及地震资料,对冀中坳陷淀南地区沙河街组一段进行了层序地层划分,建立了以体系域为单元的等时层序地层对比格架,将沙河街组一段划分为一个三级层序,并以岩性、岩相以及地层叠置样式的变化进一步细分出低位、湖侵和高位体系域。在层序地层格架的基础上,分析了沙河街组一段沉积相的构成、演化和分布规律,认为沙河街组一段主要发育三角洲相和湖泊相沉积。更多还原

【Abstract】 Based on an integration of core,drilling,logging and seismic data,the paper performs sequence stratigraphic division of the first member of the Eogene Shahejie Formation(Es1)in the Diannan area of Jizhong Depression and constructs an isochronal sequence stratigraphic correlation framework with one system tract as a unit.One third-order sequence is recognized in Es1,and it can be subdivided into a lowstand,a lake transgression and a highstand systems tract based on the stratigraphic superimposition patterns as well as its lithologic and lithofacies changes.The construction of the isochronous stratigraphic framework shed light on the analysis of composition,evolution and distribution pattern of its sedimentary facies.The result indicates that the Es1 is dominated by delta and lacustrine facies.更多还原