Abstract: The Zhongzhai Minefield in Zhijin County in Guizhou Province is rich for CBM (Coalbed methane),in order to analyze the distribution characteristics and resources potential of the CBM in the minefield,the distribution regularity and occurrence characteristics of the CBM in the minefield are discussed,and the amount of the CBM resources is estimated by volumetric method.The study results show that methane content is the lowest in the northeastern field of outcrop,and higher in the medium-deep of the minefield and Santang Syncline axis;geological structure,coal thickness,roof lithology,seam outcrop and buried depth are the main factors which affect methane content;the estimation results of CBM resource reserve is 52.77×108 m3 in the minefield;Santang Syncline is the favorable prospecting target area of CBM,enrichment degree of CBM in the central of syncline is higher than the wings of syncline.

Key words: CBM,Distribution characteristics, Occurrence regularity, Syncline, Resources potential