Abstract: Seismic traces obtained from crosswell reflection imaging and well log data are used in the multi well log restriction random inverse acoustic impedance inversion. First the crosswell reflection imaged data was inverted to obtain an acoustic impedance profile. Then some acoustic impedance traces extracted from the inversion profile were used as virtual log and combined with well log data to implement the crosswell and surface seismic joint inversion. The modeling and filed data inversion results shown that crosswell and surface seismic joint inversion can provide more restriction in the surface seismic inversion and can improve accuracy of inversion.

Key words: crosswell seismic, constrained inversion, virtual log, acoustic impedance