Study on the Delineation of Small Layers and Depositional Micro-Phases in the Qing San Section of the Gaotaizi Formation in Qian'an Oilfield Block 130Pengcheng Yang, Qingguo Zhang, Zhixiang Li and Shuyu YangE3S Web of Conf., 406 (2023) 02001DOI: https://doi.org/10.1051/e3sconf/202340602001