1. Department of Mining and Materials EngineeringMcGill University, 3610 UniversityMontréalQC, Canada, H3A 0C5
2. School of Resources and GeoscienceChina University of Mining and TechnologyXuzhouJiangsu 221008China
3. Key Laboratory of Coalbed Methane Resources and Reservoir Formation ProcessMinistry of EducationChina University of Mining and TechnologyXuzhouJiangsu 221008China