1. School of Earth and Space Sciences, Peking University, Beijing 100871, China
2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
3. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China
4. School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China