PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
China Northwest Sichuan Gas Mine of Southwest Oil and Gas Field Company PetroChina Sichuan 621700 China;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
China Northwest Sichuan Gas Mine of Southwest Oil and Gas Field Company PetroChina Sichuan 621700 China;
PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083 China;
Central and Western China basins; large-scale natural gas accumulation mechanism; structural pumping effect; mudstone water absorption effect; water-soluble gas degasification effect; fluid sequestration effect; natural gas reservoir formation;