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The tight sandstone gas reservoir in Altun region of the Qaidam Basin has the characteristics of low porosity and low permeability, low maturity, strong heterogeneity and complex pore structure. It causes the resistivity to react weakly to the fluid, it is not obvious that the conventional explanation method can distinguish the effect of the fluid property, and the difficulty of obtaining the saturation value is more difficult. Gas reservoir cause different change of the speed of sound wave ,amplitude and rock mechanics parameters, so on the basis of Gassmann theory equation we use core calibration logging, combined with the density curve and extraction of compressional wave slowness time and shear wave slowness time, build identification method of the pore fluid volume modulus and model of gas saturation based on elastic modulus, and compared with compressional wave and shear wave velocity ratio method, elastic modulus of single parameter method. This method can avoid rock matrix information, more accurately identify the reservoir pore fluid properties, and solve the electric logging problems in fluid identification. It adds a kind of method for the tight sandy gravel reservoir evaluation, and in the actual application good results have been achieved. Keywords—gassmann equation; elastic modulus; fluid identification; array sonic wave; the tight sandstone gas reservoir

Fluid identification Method of the Tight Sandstone Gas Reservoir Based on Gassmann Equation