1. ObjectivesrnLower Paleozoic shale gas in southern China has been comprehensively explored over the past few decades (Zhai GY et al., 2018; Bao SJ et al., 201
1. ObjectivesrnSouthern Sichuan is located in Xuyong-Junlian superimposed fold belt in the southern margin of Sichuan Foreland Basin, with an area of about 1500