Key Laboratory of Coalbed Methane Resources&Reservoir Formation Process(Ministry of Education) China University of Mining&Technology Xuzhou 221008 China;
School of Resources and Geosciences China University of Mining&Technology Xuzhou 221116 China;
Department of Surveying and Planning Shangqiu Normal University Shangqiu 476000 China;
Key Laboratory of Coalbed Methane Resources&Reservoir Formation Process(Ministry of Education) China University of Mining&Technology Xuzhou 221008 China;
School of Resources and Geosciences China University of Mining&Technology Xuzhou 221116 China;