Abstract:The volcanic rock in Changling fault depression of Songliao basin is characterized by difficulty to describe target,strong inhomogeneous reservoir,difficulty to evaluate the reservoir and to predict the gas-bearing range.Taking the volcanite reservoir of Yingcheng Formation in deep of Changling fault depression as studied target,and applying vulcanite geologic theory and results by gravity,magnetic,electric and seismic exploration to carry out fine study on Yingcheng Formation volcanic rock,the following knowledge is gotten: ①the volcanic rock is characteristic of high magnetic anomaly,mid-acid volcanic rock has also the character of low gravity anomaly,so the gravity and magnetic data can effectively define the distribution range of volcanic rock,but has some limitation,it should carry out fine study of volcanic rock in combining with high-precision 3-D seismic data;②the analysis on seismic feature of vulcanite facies showed the appearance of main body of volcanic rock is hummocky,the low instantaneous frequency attribute of seismic facies of volcanic rock often reflects the distribution of explosive facies-effusive facies vulcanite near volcanic vent,the strong reflection amplitude attribute often reflects the distribution of thin-layer effusive facies far from volcanic vent and volcanic sedimentary facies vulcanite;③the physical property of reservoir of mid-acid vulcanite is better than that of mid-basic vulcanite in the work area,and good or bad vulcanite reservoir had good correlation to P-wave impedance: the better the reserve physical property,the smaller the P-wave impedance;④the logging analysis showed when incident angle reaches to 25° and above,the difference between sonic impedance and elastic impedance is significant,using this difference is helpful to differentiate and identify the reservoir.The paper predicted two benefit gas-bearing blocks in Halkin volcanic rock by prestack inversion technique.