Target-oriented Time-lapse Imaging Using FWI with Prior Model Information
A. Asnaashari, R. Brossier, S. Garambois, F. Audebert and J. Virieux
Event name: 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013
Session: 4D Acquisition & Processing
Publication date: 10 June 2013
Info: Extended abstract, PDF ( 1.78Mb )
Price: € 20
We propose a target-oriented time-lapse imaging using regularized full waveform inversion (FWI) including prior model and model weighting. The scheme applies strong prior model constraints outside of the expected areas of 4D changes, and relatively less prior constraints in the 4D target zones. In application to the Marmousi model, the local resolution analysis with spike tests shows that the target-oriented inversion prevents the apparition of artifacts outside of the target areas, especially in the sequential difference method where these artifacts could contaminate and compromise the reconstruction of the real time-lapse changes. In noisy case, the target-oriented prior model weighting ensures a same behavior for both time-lapse strategies, the differential and the sequential difference methods, and leads to a more robust reconstruction of the time-lapse models.