孤东东部地区沉积发育特征新认识

New recognition in development features of sedimentation in eastern Gudong Area

沈国华 李丽

胜利油田分公司滨南采油厂，山东 滨州 256606 中国石油大学地球资源与信息学院，山东 东营 257061

传统观点认为，沾化地区沙二段应为沙二上亚段，全区缺失沙二下亚段。通过古生物化石和沉积特征分析认为，孤东东部地区主要保留沙二下亚段，而缺失沙二上亚段。前人对孤东地区沙二、沙三段沉积相进行过研究，认为属于辫状河三角洲和曲流河三角洲相沉积。通过大量岩心观察及镜下分析，结合区域区带构造特征、沉积发育的分析，认为研究区沙二、沙三段主要为扇三角洲沉积。

Traditional standpoint is that upper Es2 submember was reserved and lower Es2 submember were lost in Zhanhua Area. But this paper takes a viewpoint that upper Es2 submember was lost and lower Es₂ submember was reserved in Gudong Area according to paleontologic evidence and sedimentation characteristics. Former research showed that the braided river delta and meandering river delta facies were grown in Es2 and Es3 formations in Gudong Area. However, this paper concluded that fan delta facies was major sedimentary facies in Es2 and Es3 formations in Gudong Area by analyzing the data of drilling cores, regional structures and sedi-mentation.