1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of EducationChina University of Mining and Technology Xuzhou Jiangsu 221008 China
2. School of Resources and Earth ScienceChina University of Mining and Technology Xuzhou Jiangsu 221116 China
3. Department of Energy and Mineral Engineering, G3 Center and Energy InstituteThe Pennsylvania State University University Park PA 16802 USA
4. Jiangsu Design Institute of Geology for Mineral Resources Xuzhou Jiangsu 221006 China
5. Neutron Scattering DivisionOak Ridge National Laboratory Oak Ridge TN 37830 USA