鲁北济阳坳陷东营凹陷南坡沙河街组第四段上亚段高分辨率层序地层格架
High-resolution sequence stratigraphic framework of the Upper Submember of the Fourth Member of the Shahejie Formation on the southern slope of the Dongying subbasin, northern Shandong, China
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摘要: 应用高分辨率层序地层学与沉积学等理论，通过对地震、录井、测井资料的分析，对鲁北东营凹陷南坡沙河街组第四段上亚段进行了高分辨率层序地层学的划分与对比，总结出各层序地层单元及其界面在录井和地震资料中的判识标志，把研究区基准面旋回划分为短期、中期和长期3个级别的旋回层序。整个沙河街组第四段上亚段由一个长期基准面旋回组成，并划分出5个中期基准面旋回，首次建立了研究区内该亚段高分辨率层序地层格架，有利于东营凹陷南坡该亚段沉积微相和储层结构描述等精细地质研究的进一步开展。Abstract: High-resolution sequence stratigraphic classification and correlation are made for the Upper Submember of the Fourth Member of the Shahejie Formation on the southern slope of the Dongying subbasin, northern Shandong, based on the theories of high-resolution sequence stratigraphy and sedimentology and an analysis of well log data and seismic information, and summarizes the mariners for recognition of various sequence stratigraphic units and their boundaries in well logs and seismic data. The base-level cycle in the study area is divided into the short-term, medium-term and long-term cyclic sequences. The Upper Submember of the whole Fourth Member of the Shahejie Formation is composed of a long-term base-level cycle, which is subdivided into five medium-term base-level cycles. The authors have for the first time estabhshed the high-resolution sequence stratigraphic framework of the submember. All these studies are conducive to intensive geological studies such as the sedimentary microfacies study and detailed description of reservoir structure in this submember on the southern slope of the Dongying subbasin.
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