1. State Key Laboratory of Petroleum Resource and ProspectingChina University of Petroleum Beijing 102249 China
2. College of GeosciencesChina University of Petroleum Beijing 102249 China
3. National Engineering Research Center of Coal Mine Water Hazard Controlling (Suzhou University) Suzhou Anhui 234000 China
4. Geological Exploration Technology Institute of Anhui Province Hefei 230031 China
5. Development and Research CenterChina Geological Survey Beijing 100037 China