渤海湾盆地东营凹陷博东潜山周缘地区沙河街组等时地层对比

渤海湾盆地东营凹陷博东潜山周缘地区古近系沙河街组厚度变化大，岩-电标志难于寻找，地层对比划分难度大。以区域地质背景为出发点，在标准地震反射界面的环山引入、古生物地层分析、地震不整合分析等基础上，综合应用岩性、电性等识别方法，进行了界面的准确识别以及等时地层格架的建立，探索了适合环山地区“标准界面引入-多因素约束”的等时地层分析和对比方法。研究区沙河街组发育完整，发育了大致和沙河街组四段下亚段、沙河街组四段上亚段、沙河街组三段下亚段、沙河街组三段中亚段、沙河街组三段上亚段-沙河街组二段下亚段、沙河街组二段上亚段-沙河街组一段等地层单元相对应的6个三级层序。博东潜山的发育对沙河街组四段-沙河街组三段下亚段沉积时期的地层发育特征影响最大，而对沙河街组二段上部及其上覆地层的影响则不明显。

An isochronous stratigraphic correlation of the Shahejie Formation in the periphery of the Bodong buried hill in the Dongying Sag,the Bohai Bay Basin

The Paleogene Shahejie Formation in the periphery of the Bodong buried hill of the Dongying Sag，the Bohai Bay Basin，features in large variation of thickness and subtle lithologic and electric markers，challenging stratigraphic correlation and division.Based on an analysis of regional geological background，an application of standard seism ic reflectors and analyses ofpaleontology and seism ic unconform ity，the paper accurately identifies layer boundaries and establishes an isochronostratigraphic framework by using lithologic and electric property identification methods.It presents an isochronostratigraphic correlation method known as“standard seism ic reflector introduction multiple factor constraint”.The Shahejie Formation is well developed in the study area and six thirdˉorder sequences are recognized.Development of the Bodong buried hill had the greatest influence over the deposition of the fourth member the lower part of the third member of the Formation，but had only a m inor effect upon the sedimentation of the upper part of the second member and its overlaying layers.