1. College of Petroleum Engineering, Liaoning Shihua University, Fushun, Liaoning, P. R. China;
2. College of Architecture Storage Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China;
3. China Nation Aviation Fuel Group Limited, Beijing, P. R. China;
4. China National Offshore Oil Corporation, Beijing, P. R. China;
5. Yanchang Petroleum Group Exploration Company, Yanan, Shanxi, P. R. China