College of Energy Chengdu University of Technology Chengdu 610059 ChinaPetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
University of Houston Houston 77004 USA;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi''an 710018 China;
Sichuan Basin; Wufeng-Longmaxi Formation; organic-rich shale; biogenic quartz; reservoir-forming mechanism;