Abstract:

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.

Key words: Shahejie Formation, stratigraphic sequence, Bodong buried hill, Dongying Sag, Bohai Bay Basin