[1]Research Institute of Petroleum Exploration & Development;
PetroChina;
Beijing 100083;
China;
[2]Chuanzhong Gas Mine;
Southwest Oil and Gas Company;
PetroChina;
Suining 629000;
China;
[3]Northwest Sichuan Gas Mine;
Southwest Oil and Gas Company;
PetroChina;
Jiangyou 621709;
China;
[4]Exploration and Development Research Institute;
Southwest Oil and Gas Company;
PetroChina;
Chengdu 610051;
China;
[1]Research Institute of Petroleum Exploration & Development;
PetroChina;
Beijing 100083;
China;
Sichuan Basin; Triassic; Xujiahe Formation; coal-derived gas; iC4/nC4; iC5/nC5; maturity indicator;