Int. J. Oil, Gas and Coal Technology, Vol. 8, No. 4, 2014 449 Copyright © 2014 Inderscience Enterprises Ltd. Geological factors on gas entrapment mechanism and prediction of coalbed methane of the no. 6 coal seam in the Jungar coalfield, northeast Ordos Basin, China Yongkai Qiu* Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, School of Energy Resources, China University of Geosciences, Beijing, 100083, China and G3 Center, EMS Energy Institute, Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, PA 16801, USA Email: yongkaiqiu@gmail.com *Corresponding author Dameng Liu Coal Reservoir Laboratory of National Engineering Research Center of CBM Development and Utilization, School of Energy Resources, China University of Geosciences, Beijing, 100083, China Email: dmliu@cugb.edu.cn Derek Elsworth G3 Center, EMS Energy Institute, Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, PA 16801, USA Email: elsworth@psu.edu