Abstract: Based on the analysis of response characteristics and mechanisms of all fractures on conventional log and imaging log in Tahe area,the fractures were recognized by comprehensively using core data,energy attenuation of Stoneley wave,imaging log and dual laterolog resistivity. Furthermore,AC-CNL cross-plot method was applied to discriminate the fluid type in the fractured reservoir. The application on actual data in Tahe area shows that the method can effectively recognize oil & gas layers in fractured reservoirs,good results have been achieved in the area.