The crushability evaluation of shale reservoir is a complex system engineering. But as there are many parameters that affect the reservoir crushability

including the reservoir basic geological parameters

the rock mechanics

the formation pressure

the in-situ stress and the engineering technology

and the main influencing factors of different gas fields are different

multiple round of pilot tests are needed just to find out the main control factors affecting the productivity in complex working areas. Until now

there is no unified and authoritative evaluation method for shale reservoir crushability in China

it is extremely urgent to complete this task. Therefore

a method for shale gas reservoir crushability evaluation based on grey correlation analysis is proposed. This method has the advantages that it can quickly identify the main control sensitive parameters that affect the production. The correlation of the parameters is strong. And the production after fracturing can be predicted according to the sensitive parameters. With the increase of the number of developed wells

the prediction accuracy will be higher. In the gas field

the main control sensitive parameters can be adjusted by the optimization of engineering process

so as to further improve the fracturing effect.