1. College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
4. Key Laboratory of Petroleum Geochemistry, CNPC, Beijing 100083, China