Abstract: 3D modeling has been a key problem in the study of the volcanic rock reservoir in the northern part of the Songliao Basin. Take the Shengping area of the Songliao Basin as a target area, and select Petrel software and use data of tectonic interfaces and faults, the authors firstly establish the structure and the fault model of the area; secondly, by combination of certainty modeling and stochastic modeling methods, and by unite of both structural and fault models, the authors depict typical volcanic-rock characteristics and the changing law of lithofacies in three-dimensional space in detail to carry out the dynamic expression and display of volcanic reservoirs of the complex tectonics target zone by 3D visualization. The three dimensional structural model reveals that the northwest and the south of the study area are lack of the strata of the Yingcheng Formation and there is a dome structure with two structural highs in the area. The dome is closed at -2 810 m isopach, with an area of 32.45 km².The structural high is at -2 660.5 m level，and is of an amplitude of 150.5 m. Most of faults are oriented in N-S direction and are 2-5 km long，with a displacing distance of 8-30 m.

Key words: reservoir modeling, 3D geological model, 3D visualization, Songliao Basin