PetroChina Research Institute of Petroleum Exploration&Development 100083;
PetroChina Hangzhou Geological Research Institute 310023;
Sinopec Exploration Company 610000;
Deyang-Anyue rift trough; geological characteristics; secondary slope; development and evolution; Cambrian Maidiping Formation; Cambrian Qiongzhusi Formation; Sinian Dengying Formation; Sichuan Basin;