Pressure and Saturation Inversion from 4D Seismic Constrained by Production Data

A036 PRESSURE AND SATURATION INVERSION FROM 4D SEISMIC CONSTRAINED BY PRODUCTION DATA Abstract We have developed an inversion technology to estimate reservoir pressure and fluid saturation distribution from time-lapse seismic and production data. Bayesian technology is used to construct the objective function; Gauss- Newton method is applied to minimize the objective function in the inversion process. 4D seismic is converted to impedance to minimize the wavelet effect and simplify the inversion scheme. Rock physics links the reservoir properties both static (porosity facies) and dynamic (pressure and saturation) with seismic P & S impedance. The sensitivity of impedance with respect to