The matrix pores in coal play a little role in fluid flow,therefore the permeability derived from well test is the reflection of the percolation flow capacity in cleat system.

• 煤基质的孔隙性对流体流动影响极小 ,试井所得渗透率反映的是割理系统的渗流能力。储层压力的变化引起有效应力改变 ,使得煤层裂隙张开度和渗透率发生变化 ,渗透率随储层压力下降而减小。