State Key Laboratory of Coal Resources and Safe Mining;
China University of Mining and Technology;
Beijing 100083;
China;
State Key Laboratory of Organic Geochemistry;
Guangzhou Institute of Geochemistry;
Chinese Academy of Sciences;
Guangzhou 510640;
China;
Langfang Branch of PetroChina Petroleum Exploration and Development Research Institute;
Langfang 065007;
China;
Energy College;
China University of Geosciences;
Beijing 100083;
China;
School of Resource and Safety Engineering;
China University of Mining and Technology;
Beijing 100083;
China;