Application of the finite-difference contrast-source inversion algorithm toseismic full-waveform data

摘要

We have applied the finite-difference contrast-source inversionFDCSI method to seismic full-waveform inversionproblems. The FDCSI method is an iterative nonlinear inversionalgorithm.However, unlike the nonlinear conjugate gradientmethod and the Gauss-Newton method, FDCSI doesnot solve any full forward problem explicitly in each iterativestep of the inversion process. This feature makes the methodvery efficient in solving large-scale computational problems.It is shown that FDCSI, with a significant lower computationcost, can produce inversion results comparable in quality tothose produced by the Gauss-Newton method and better thanthose produced by the nonlinear conjugate gradient method.Another attractive feature of the FDCSI method is that it iscapable of employing an inhomogeneous background mediumwithout any extra or special effort. This feature is usefulwhen dealing with time-lapse inversion problems where theobjective is to reconstruct changes between the baseline andthe monitor model. By using the baseline model as the backgroundmedium in crosswell seismic monitoring problems,high quality time-lapse inversion results are obtained.