80th EAGE Conference & Exhibition 2018
Opportunities presented by the energy transition
Seismic Imaging with Ray and Waves - Where do we stand? Part II: Imaging
Monday 11 June 2018
|Title:||Seismic Imaging with Ray and Waves - Where do we stand? Part II: Imaging|
|Convenors:||R. Brossier (Université Grenoble Alpes)
R. Plessix (Shell)
P. Routh (ExxonMobil)
Full waveform inversion in conjunction with ray-based tomography is nowadays commonly used to obtain the background model needed for imaging. In addition, FWI could potentially replace the common workflow of migration followed by elastic impedance inversion, so as to directly deliver impedance volumes. However, the use of FWI raises a number of questions. For instance, over the last three decades, we have moved from post-migration to pre-stack migration to capture the amplitude variations with angle and hence estimated the compressional and shear impedance variations crucial for reservoir characterization. However, most of the current high-resolution FWI are run acoustically, notably for computational cost reasons. What is then the value of the high-resolution acoustic imaging obtained by FWI? Are the elastic effects problematic? This FWI approach questions the commonly used acoustic assumption and the full wave modeling approach. Is the linearization approach around an acoustic background a more practical approach, as is commonly done with migration? Do we see value of the full wave modeling in presence of multiples? How do the FWI impedance estimates compare with the traditional migration + stratigraphic inversion approach where geological and sparsity constraints are generally added?
During this workshop, we propose to review the high-resolution FWI approach in comparison to the ‘migration + stratigraphic’ approach. We would also like to discuss the challenges encounter by both approaches.
Who should attend
Researchers interested in seismic imaging and seismic velocities.