SEDIMENTARY MICROFACIES OF Ed₃ IN DAWANGZHUANG AREA OF RAOYANG SAG

To solve the problem of inconsistencies in the determination of sedimentary facies types in Dawangzhuang area, on the basis of regional tectonic evolution, with drilling data, sedimentary structure marks and logging data, this paper discusses the controlling of surrounding buried hills and subsags on the source direction and sedimentary facies types during the sedimentary period of the third member of Dongying Formation (Ed₃), and establishes the sedimentary model of Ed₃. The results show that the subsidence center is located in the northeast of study area during the sedimentary period of Ed₃, which mainly receives the provenance deposits of Shenze low salient in the southwest. During the sedimentation of Dongying Formation, with the uplifting of fault depression, the lake basin shrinks rapidly, the terrain becomes flat gradually, the sedimentary facies continues to extend, and the meandering river facies is developed in the Ed₃ of Dawangzhuang area. The detailed study of sedimentary facies provides a basis for reservoir prediction.