1. College of Geosciences China University of Petroleum (Beijing) Beijing 102249 China
2. State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing) Beijing 102249 China
3. Beijing Research Institute of Uranium Geology Beijing 100029 China
4. Hainan Branch of China National Offshore Oil Corporation Ltd. Haikou 570100 China
5. Zhanjiang Branch of China National Offshore Oil Corporation Ltd. Zhanjiang 524057 China
6. University of Alberta 116 St. and 85 Ave. Edmonton Alberta T6G2R3 Canada