Sedimentary characteristics and controlling factors of beach bar sand body in the lower part of the first member of Shahejie formation of Gaoyang area

In view of the complex distribution law and unclear main controlling factors of the beach bar sand body in the lower part of the first member of Shahejie formation in Gaoyang area,the sedimentary characteristics,distribution law and controlling factors of the beach bar sand body in the study area are analyzed by comprehensively using the core,thin section,drilling and logging data.The results show that the beach bar sand body in the study area is developed,and has the characteristics of "multi-skip and one suspension" grain size and interactive deposition with carbonate beach bar and shore shallow lacustrine mud.Further analysis shows that the formation of beach bar sand body is closely related to provenance supply,paleogeomorphology and lacustrine shoreline,and beach bar sand body has experienced three system tract periods of low,lacustrine transgression and high,and the scale,size and distribution of sand body are different in different system tract periods.On the basis of the above research,the depositional model of beach bar sand body in this area is established,which provides guidance for the next exploration and development in this area.