1. Key Laboratory of Oil & Gas Exploration and Development Theory and Technology, China University of Geosciences (Wuhan), Wuhan, Hubei Province 430074, PR China
2. School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, PR China
3. School of Mining and Petroleum, Department of Civil and Environmental Engineering, University of Alberta, Edmonton T6G 1H9, Canada