It has been proved that the volcanic gas reservoir has high output and large reserves in Songnan fault depression ofSongliao basinand the volcanic rock reservoir in non-well area is an important target for oil and gas exploration being in present of low oil price.Due to the fact that different volcanic facies have different seismic reflection feature on the seismic section, and several volcanic eruptions and the late tectonic reworking make the seismic reflection characteristics more complicated, using a single seismic attribute to describe two or more mixed volcanic facies is very difficult.Based on analysis of response relationship between the development of different lithofacies reservoirs and the sensitive attribute, technique of seismic multi-attribute fusion was applied.The volcanic reservoir were predicted by using the attribute fusion method of multi-attributes clustering and ant tracking, among which,the multi-attributes combining with two main types of sensitive seismic attributes of volcanic rocks:derivative instantaneous amplitude and low-frequency amplitude.The method can identify volcanic facies from other facies quickly and clearly, describe the boundary of the volcanic mechanism and development situation of the fractures of volcanic mechanism inside.The seismic multi-attribute fusion method was used to describe the reservoir of the mixed rock facies in S area of Songnan fault depression and the prediction results are consistent with the actual drilling,which can provide the basis and technical reference for the exploration and deployment of volcanic rocks in the area without well.