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煤层气是储集在煤层中的非常规天然气.煤层中发育有微孔隙系统和裂隙系统，煤层气主要以物理吸附的形式赋存于煤的内表面上，当压力降低时，煤层气发生解吸、扩散和渗流，最后由井筒中产出.了解煤层气的赋存、运移机理及产出特征，对进行煤层气的可采性评价十分重要.
CBM is an unconventional natural gas stored in the coal seam. Micropore systems and fracture systems are developed in the coal seam. CBM mainly exists in the form of physical adsorption on the inner surface of the coal. When the pressure decreases, the CBM desorbs , Diffusion and seepage, and finally output from wellbore.It is very important to understand the occurrence, migration mechanism and output characteristics of CBM, and to evaluate the recoverability of CBM.