1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
2. National Energy Tight Oil and Gas R & D Center, Beijing 100083, China
3. Key Laboratory of Oil and Gas Reservoirs, China National Petroleum Corporation, Beijing 100083, China
4. Daqing Oilfield Limited Liability Company, PetroChina, Daqing 163000, China