Reconstruction and petroleum geological significance of lithofacies paleogeography and paleokarst geomorphology of the Middle Permian Maokou Formation in northwestern Sichuan Basin, SW China

ZHONG Yuan,YANG Yueming,WEN Long,LUO Bing,XIAO Di,LI Minglong,CHEN Cong,ZHAO Like,LU Feifan,TAN Xiucheng

Fig. 2. The sequence boundary between the Qixia Formation and LSC1. (a) Stratigraphic column of Well ST1; (b) Imaging log of Well YB6; (c) Changjianggou Section. GR—natural gamma ray; Δt—acoustic time difference.