Abstract: On the basis of the sequence instruction analog technique, with seismic variance data as soft data and single well fracture analysis data as hard data, the fracture growth area model, large scale fracture model, small scale fracture model and relevant fluid dynamics model of Igneous Rock Reservoir in Che well21 area of Chepaizi Oilfield are established by the use of geological, seismic, drilling, logging, oil well test data, and Petrel and Fraca software. These models are used to finely describe the spatial distribution feature and law of different spatial scale fracture and the rightful forecast of fracture linking up radius is realized. The findings indicate the orientation of the most natural fractures is SN, NEE and NWW, fracture distribution is heterogeneous, the fractures around faults develop better than the ones in other areas, the feed flow radius of fracture is about 75 meters, last, the areas around faults are the optimal target areas for next exploration extension.

Key words: Chepaizi Oilfield, Igneous Rock, fractured reservoir, 3D geological model, reservoir characteristic, Junggar Basin