PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
PetroChina Southwest Oil&Gasfield Company Chengdu 610051 China;
PetroChina Southwest Oil&Gasfield Company Chengdu 610051 China;
PetroChina Southwest Oil&Gasfield Company Chengdu 610051 China;
southern Sichuan Basin; Lower Silurian Longmaxi Formation; deeply buried shale gas; high production control factors; deep water and deep burial; shale gas reservoir;