In order to quicken the search for oil and gas in complicated underground media, the niche multi-parameter inversion algorithm based on EMPM (equivalent model of porous media) and seismic CT is proposed for porous media full of single-phase fluid.

To overcome ill conditioning and multiple minima in inversion process efficiently,a wavelet multiscale-regularized Gauss Newton method is presented and applied to the multiparameter inversion of fluid-saturated porous medium.

In multiparameter constrained inversion, the wave impedance data derived from logging data are used as constraint condition to make band constrained inversion, then many parameter sections can be produced by doing extrapolation using both the result of band constrained inversion and the models of lithology and porosity which are taken from logging data inversion.

The multi-solution of inversion by single parameter and layer-labeling uncertainty are two difficult points that restricted the precision of reservoir prediction in complex fault block zone,which can be avoided to a certain degree by using multi-parameter integrated inversion.