The permeability of high rank coal reservoirs tends to decline in exponent gradually, which is similar to the relationship between the permeability and effective stress obtained by physical simulation.

• 煤储层渗透率随著煤层气井排采时间呈指数规律缓慢衰减，与物理模拟实验结果显示的渗透率与有效应力的关系具有相似的结论。