Department of Unconventionals Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China;
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and Technology Xuzhou 221008 ChinaSchool of Resource and Geosciences China University of Mining and Technology Xuzhou 221116 China;
Department of Unconventionals Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China;
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and Technology Xuzhou 221008 ChinaSchool of Resource and Geosciences China University of Mining and Technology Xuzhou 221116 China;
Department of Unconventionals Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China;
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and Technology Xuzhou 221008 ChinaSchool of Resource and Geosciences China University of Mining and Technology Xuzhou 221116 China;
coalbed methane; low-permeability coal reservoir; NMR; gas displacing water; flowability; pore size;