Abstract: The Member 3 of Paleogene Dongying Formation (E₂d₃) in the eastern part of the Liaohe Depression tidal area is a key target layer for oil and gas exploration. Based on the data of core and logging, the provenance and sedimentary facies of E₂d₃ in the study area were analyzed by combining clastic components, heavy minerals, sedimentary elements, and core facies with logging. The analysis results show that there are three provenance systems of the E₂d₃ in the tidal area, namely northern provenance, eastern provenance, and Yuedong buried hill in the northwest; the sedimentary facies in the study area are mainly composed of the braided river delta frontal subfacies and shore-shallow lacustrine subfacies, which are controlled by the tectonic background and provenance, and the sedimentary distribution of the three subsections in the E₂d₃ of the study area is relatively similar, the braided river delta front is mainly developed in the northern part of the study area, while the braided river delta front and shore-shallow lacustrine beach-bar are developed in the eastern area, and shoreshallow lacustrine beach-bar is developed in the northwest area. Our study provides a sedimentary geological basis for the further exploration and favorable reservoir prediction of the E₂d₃ in the east of the Liaohe depression tidal area. 

Key words: Liaohe Depression, Eastern tidal area, Dongying Formation, Prov enance, Sedimentary facies