1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, P.R. China
2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, P.R. China
3. Shaanxi Yanchang Petroleum (Group) Corp., Ltd., Xi’an 710075, P.R. China
4. Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N1N4, Canada