东濮凹陷是否有海侵发生 ,直接影响着油气资源的评价 .通过对钙质超微化石、沟鞭藻类、遗迹化石、枝管藻、鱼类等古生物化石资料和石盐中的溴 ( Br-)及溴氯系数 ( Br-× 1 0 -3/Cl-)、碳酸盐岩中氧和碳同位素 ( δ18O,δ13C)值、泥岩中的 w( Th) /w( U)值等地化资料分析研究 ,认为东濮凹陷早第三纪沙河街组三段、一段沉积期发生过海侵事件 Whether there is transgression occurs in Dongpu Depression directly affects the evaluation of oil and gas resources.According to the data of paleontological fossils such as calcareous microfossils, dinoflagellates, trace fossils, branch pipe fines and fish and bromine (Br -) and bromochlorid (Br- × 10-3 / Cl-), oxygen and carbon isotopes (δ18O, δ13C) in carbonate rocks and w (Th) / w According to the data analysis and research, it is considered that the third member of Shahejie Formation of Early Tertiary in Dongpu Depression was transited during the depositional period