Sedimentary facies study of Dongying Formation in Wenan slope

The overall sedimentary facies characteristics and distribution of sedimentary facies have been discussed in this article based on core and log data study.The sedimentary facies of the study area is determinated as fluvial facies through a detailed study.Through a detailed analysis of core data from the study area, it is believed that that Dongying Formation is dominated by point bar microfacies, natural levee microfacies and floodplain microfacies.Based on the core data analysis, it is found that three types of logging curves response well to sedimentary facies, and the logging facies model has been constructed. According to the sedimentary facies distribution of Dongying Formation, fluvial deposition and flood plain deposition are mainly developed in the study area, the main types of river are meandering river to anastomosing rivers, distributing from east to west.In the early stage, downward erosion was dominated and lateral erosion was dominated in the mid-late stage.The river became shallow and widened until it disappeared towards the lake basin and became a flood plain.Based on this analysis, the flood plain of fluvial sedimentary facies model has been constructed.