Full Waveform Inversion

Full-Waveform Inversion (FWI) derives high-resolution velocity models by minimizing the difference between observed and modeled seismic waveforms. It goes beyond refraction and reflection tomography techniques, which use only the travel time kinematics of the seismic data, by using additional information provided by the amplitude and phase of the seismic waveform.

The highly detailed models provided by FWI can be used to resolve complex geological features, as well as aid in identifying potential geohazards. These high-definition models can also be input directly to pore pressure prediction flows, time-lapse monitoring and reservoir characterization analysis. Subsurface images produced using these highly accurate models provide interpreters with a much higher degree of confidence with respect to reservoir delineation and subsequent well planning.

Many areas across the world share a common issue – complex near-surface conditions such as shallow gas anomalies, sediment carapace, permafrost, volcanic intrusions and paleo-canyons. FWI is well suited to handling these challenges."

Handling anisotropy & cycle skipping

Our FWI algorithms honor anything from isotropy to orthorhombic anisotropy. In FWI, the problem of cycle-skipping occurs when the difference in arrival time between modeled and observed data is larger than a half-cycle of the dominant frequency. It can cause the algorithm to converge on a wrong local solution. We have developed technology and workflows to mitigate this issue, especially for data with a lack of low-frequency signal or with a less accurate starting model.

 

This FWI example extracted from our 25,000 km2 BroadSeis™ multi-client survey offshore Gabon shows the level of detail provided for interpreters.

A new parameter set for anisotropic multipara...

Nuno Vieira Da Silva | Andrew Ratcliffe | Vetle Vinje | Grah...
©2016 SEG

Subsea Karst detection and imaging improvemen...

F. C. Loh | B. L. Chuah | J. Zhou | T. Manning | S. Wolfarth...
©2016 EAGE

An offshore Gabon full-waveform inversion cas...

Bingmu Xiao | Nadezhda Kotova | Samuel Bretherton | Andrew R...
©2016 SEG
Offshore - BroadSeis

BroadSeis

Broadest bandwidth, best low frequencies deliver accurate models for better decisions. Choose BroadSeis at all stages from exploration to production.

Subsurface Imaging - RTM

Reverse Time Migration

Create accurate seismic images in the most complex of geological environments.

Multi-Client Data - Gabon

Gabon

Over 25,000km2 PSDM seismic data available as part of a complete geoscience package including regional geological analysis in this prospective area.
Subsurface Imaging

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