Abstract:Reservoir porosity prediction using two parameters is a new method for predieting reservoir porosity by using two parameters,namely,velocities of P-wave and S-wave,or interval time and density The laboratory result of D Eberhart-Phillips and the computation result of logging data from six boreholes in JLK area indicate that the average relative error of the porosities derived from velocities of P-wave and S-wave is 7 86%,and that the average relative error of the porosities derived from interval time and density is 13.0%.Besides the predicted porosity,the method also offers reliable shale content,which is very significant to discovering the heterogeneity of a reservoir.