论文部分内容阅读
1. ObjectivesrnSouthern Sichuan is located in Xuyong-Junlian superimposed fold belt in the southern margin of Sichuan Foreland Basin, with an area of about 15000 km2. The coal measures of Upper Permian Xuanwei Formation and Longtan Formation are characterized by mudstone, clayey mudstone, fine sandstone, siltstone, and coal seams interbedded.