A litho-facies characteristic of Zadonian marker bed of Antipovsko-Balykleisky field
This article describes sediments litho-facies characteristic of Zadonian marker bed of Antipovsko-Balykleisky field. The lithology of carbonate deposits is analyzed. The rocks are represented by carbonate deposits which are very diverse in lithology with predominance of oolite (grainstones/wackestones) and algal limestones (bindstone/boundstone). Four types of facies are identified in the field based on the litho-paleontological data and paleo-structural analysis results obtained from the study of more than forty wells logs. They are the following: 1) pre-reef facies; 2) off-reef facies; 3) algal masses cores; 4) back-reef facies. The location of the well-known facies is updated and new algal masses cores perspective for oil and gas are traced in Zadonian marker bed.