Full Waveform Inversion (FWI)

High-frequency FWI utilises the entire seismic wavefield to generate refined, high-resolution velocity models for imaging and characterisation.

DUG boasts some of the largest supercomputers in the world with high-tech data centres in Perth, Houston, London and KL. This is a key factor which enables us to deliver cutting-edge imaging technologies such as high-frequency FWI.

Starting velocity model and final model after FWI. Depth slice and inline with migrated stack overlaid with the respective velocity model. In this OBN example the shallow channels are well resolved after FWI, correcting the imaging distortions at depth. (Data courtesy of AGS and TGS)

Before and after FWI. Smooth starting velocity model prior to FWI (left) and after FWI, co-rendered with the seismic data (right). (Data courtesy of Shell NZ).

Full Waveform Inversion

FWI inverts for a high-resolution earth model using the entire seismic wavefield. It is an integral part of our depth model building strategies. At a high level, what FWI tries to do is actually quite simple. It iteratively updates an initial model by forward modelling synthetics and comparing them to field data. As part of the DUG Wave software infrastructure the FWI implementation can incorporate isotropy, VTI, TTI and Q.

High-frequency FWI

At high frequency the benefits of FWI extend beyond imaging towards interpretation and characterisation. As can be seen in the figures detailed structural and stratigraphic details are resolved in the FWI model.

Conventional low-frequency FWI model and high-frequency FWI model. Note the increasingly sharp stratigraphic and structural details in the high-frequency model. (Capreolus 3D data courtesy of TGS)

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