Abstract:Aiming at the problem of Wangfu volcanic rock gas reservoir that the lithology is complex and gas-water percolation law is not clear, using the experimental techniques, such as X-ray diffraction, mercury injection, nuclear magnetic resonance (NMR), threshold pressure gradient,ect, to study volcanic rock reservoir characteristics and the percolation law of individual gas and gas-water two-phase in Wangfu gas field. The results show that Wangfu gas reservoir lithology is mainly for the rhyolite , andesite and volcanic breccia, which belongs to low porosity reservoir, whose reservoir space type is hole seam. When volcanic rock core is single-phase gas flow, the transition critical point of individual gas percolation flow state is 1~2 Mpa. If using the flow rate and gas flow pressure gradient as axis which describes gas flow curve, the curve features divides into two different percolation forms in the limit of 0.05 x 10-3μm2. When gas seepage in the volcanic rock core which is containing water and the irreducible water saturation is less than 60%, the threshold pressure gradient of the hole seam rock sample is significantly lower than the porous rock samples.