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ASEG Tech Talk - Multi-parameter FWI imaging: high-resolution imaging directly from raw field data

Event Type

Event Date

Tuesday, May 10, 2022

Event Location

Event Address

Zoom, virtual webinar

Event Start

1900 AEST

Event End

2000 AEST

Event Details

Title: Multi-parameter FWI imaging: high-resolution imaging directly from raw field data

Presenter: Tom Rayment, Chief Geophysicist, DUG Technology

Date: Tuesday 10th May 2022

Time: 7pm AEST

Registration: https://us02web.zoom.us/webinar/register/WN_CN-_WOEpTemeHTx7FF_gtA

 

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 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.