Register here for the Australian Society of Exploration Geophysics (ASEG) virtual Tech Talk titled “Multi-parameter FWI imaging: high-resolution imaging directly from raw field data”, presented by our chief geophysicist Tom Rayment.
Event details:
- Virtual event (Zoom)
- Tuesday, May 10, 2022
- 7–8 pm AEST
Presentation abstract:
Traditional seismic processing workflows can be extremely time-consuming since subsequent stages are only begun after extensive testing and QC of the current process. This linear approach takes the raw field data and passes it through a plethora of conditioning tools (such as designature, deghosting, demultiple and regularisation) to transform the data into a form that can be imaged by legacy migration algorithms, such as Kirchhoff 3D preSDM.
Full waveform inversion (FWI) imaging is a multi-scattering least-squares approach that uses the raw field data to estimate many subsurface parameters, including reflectivity, simultaneously ahead of a conventional processing workflow. Since it is using the primaries, multiples and ghosts during imaging, the result is a set of higher resolution subsurface models but in a fraction of the time of a conventional processing workflow due to the fact that little to no pre-processing is required.
In this presentation, we demonstrate an 85 Hz comparison between a conventional processing workflow and a novel FWI imaging technique that utilises an augmented wave equation and an advanced optimisation scheme. The FWI imaging approach is simultaneously inverting for velocity and an intercept-reflectivity vector which is fit for structural and amplitude analysis.
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