Schlumberger

Full-Waveform Inversion (FWI)

Overview Library

High-resolution earth models

3D prestack acoustic full waveform inversion (FWI) uses the two-way wave equation to produce high-resolution velocity models. It performs forward modeling to compute the differences between the acquired seismic data and the current model as well as a process similar to reverse-time migration (RTM) of the residual dataset to compute a gradient volume and to update the velocity model.

FWI enhances resolution in velocity model

In this NW Australia FWI example, the left image shows the velocity field from standard PSDM tomography, while the right image is the output from FWI. This new level of detail has helped the operator improve reservoir positioning and optimize drilling decisions.

Enhance prospect evaluation and reservoir exploitation

FWI is suitable for all acquisition geometries, including wide-azimuth (WAZ) and full-azimuth (FAZ) surveys. The time-domain implementation complements our RTM algorithm and produces results that compare well to frequency-domain inversion, with the advantage of being efficient in 3D. When combined with imaging using RTM, the final product improves because of consistent wavefield solutions throughout the depth-imaging workflow.

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WesternGeco

FWI Application Improves Offshore Drilling Decisions

4D seismicAn example highlighting how FWI produces a high-resolution velocity model.
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