Abstract: The volcanic facies in study area include 12 subfacies in 5 volcanic facies. The porosity and permeabiltiy is better in upper sub-facies of effusive facies, inner subfacies of extrusive facies, cryptoexplosive breccias subfacies of volcanic conduit facies. Based on statistical results and the volcanic lithology and facies map, high cracks surface pore concentrates at diatreme subfacies and cryptoexploisve sub-facies of volcanic conduit facies, inner subfacies of extrusive facies, pyroclastic flow subfacies and base surge subfacies of explosive facies, lower subfacies of effusive facies which are close to the volcanic edifices center. Holes surface pore focus on upper and middle subfacies of effusive facies which locates in the edifice slope. Finally, according to the definition and category, the favorable reservoir is located at craters and mountain ridge of paleovolcano and surface pore data are outward reduced in zonal shape or one-side reduction.

Key words: Songliao Basin, Yingcheng Formation, volcanic facies, volcanic reservoir, spatial distribution