Abstract: In recent years, volcanic rock reservoir exploration has become a hot spot in Junggar Basin, and breakthrough progresses have been made in different areas of Junggar Basin. The fact that the volcanic rock masses are stacked on each other increases the difficulty of identification and brings great difficulty in the prediction of effective reservoirs and oil and gas development. Under the guidance of "one rock mass,one reservoir" reservoir model, the data of geology, core, logging curves, analytical test, seismic and development dynamics,were used to confirm the fissure eruption mode and volcanic eruption periods. Six types of volcanic rock mass consisting of twelve sets of lithologic section were classified according to lithologic cycles and seismic reflection characteristics. The testing result further confirms that there are two main volcanic reservoir rock masses,and single volcanic reservoir rock mass has the characteristics of wide area,big thickness and large scale. The volcanic rock masses are inclined to the southeast direction overall,and constitute the ridge-like fault-stratigraphic trap reservoir together with the overlying sedimentary strata under the control of the faults. These results have great significance for the prediction of effective reservoirs and improvement of oil and gas production.

Key words: relative permeability curve, relative permeability curve classification, phase index, Willhite empirical formula