1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
2. College of Geoscience, China University of Petroleum (Beijing), Beijing 102249, China
3. Dagang Oil Field of CNPC, Tiajin 300270, China
4. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China