Abstract: After years of exploration and development, over 20 tight clastic rock gas pools have been found in different regions and formations in the West Sichuan Depression. However, there is no unified division standard for the types of tight clastic rock gas pool. Based on the achievements of gas pool description and exploration, according to the cause of trap and compaction and pressure, the division standard and method suitable for this region are put forward, thus dividing gas pools into 3 types (structure-lithology, structure-digenesis and structure-fracture) and 5 inferior types. The characteristics of typical pool types are also described.