Abstract: Coalbed gas exploration and development of the low-rank coal reservoirs in the Jurassic continental basins of Northwest China is drawing more an more attentions ．The reservoirforming mechanism is important for the exploration an d development of the coalbed gas because the coalbed gas store is one of the key geological processes．The results of this study indicate that there are high pore volume，high pore specific surface area，high free gas storing potential and low gas absorption in the low-rank coal reservoirs of the Jurassic continental basins in the Junggar and Tuha Basins and the gas storage quantity in the deep coal reservoirs might be remarkably higher．The shallow coal reservoirs pools primarily absorption gas ， but in the deep coal reservoirs ，absorption，dissociation and dissolution gases may coexist．The structural elevation and traps might influence greatly the formation of deep coalbed gas pools． Concurrent exploration and development for both coalbed gas and normal natural gas is theoretically feasible，however，the deep coalbed gas reservoirs might be more valuable for the development．