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渤中凹陷东营组内发育了内陆湖盆中罕见的大型湖泊三角洲 ,其规模与海相盆地三角洲相当。通过渤中凹陷下第三系层序地层格架及其充填样式与构造特征的分析 ,探讨了东营组底部大规模超覆不整合、局部侵蚀削截不整合的表现形式 ,沙河街组与东营组之间的沉积—构造转换 ,东营组大型湖泊三角洲发育的地质背景和东二段大规模三角洲沉积体系的沉积特征与油气勘探前景。
The Dongying Formation in the Bozhong Depression has developed a large lacustrine delta rarely seen in the inland lacustrine basin. Its size is comparable to that of the marine basin delta. Based on the analysis of the sequence stratigraphic framework, filling pattern and tectonic features of the Lower Middle Tertiary in the Bozhong Sag, this paper discusses the manifestations of large-scale overconformity unconformity and partial erosion and truncation in the bottom of Dongying Formation. The Shahejie Formation and Dongying Sedimentary-tectonic transformations between groups, the geological background of the large-scale lake delta development in Dongying Formation and the sedimentary characteristics and prospect of the large-scale deltaic sedimentary system in the second member of the Dongying Formation.