Full Waveform Inversion

Full Waveform Inversion (FWI) estimates high-resolution velocity models by minimizing the difference between observed and modelled seismic waveforms. It goes beyond refraction and reflection tomography techniques, which use only the travel time kinematics of the seismic data, and uses additional information provided by the amplitude and phase of the seismic waveform. FWI is applicable to most acquisition scenarios including broadband, wide/full azimuth, marine, ocean bottom and land.

Many areas of the world feature highly variable near-surface conditions and complex shallow geology, such as permafrost, paleo-canyons, supra-salt carapace or shallow gas pockets. These cause rapid variation in seismic velocities and related attributes, which can be difficult to model using conventional techniques. Unresolved complexity in the shallow causes uncertainty and inaccuracy deeper down, where hydrocarbon targets are often located. FWI is a versatile method well suited to these challenges, producing accurate and detailed velocity models which can be used by imaging algorithms, such as Reverse Time Migration (RTM) to provide clearer subsurface images, thus facilitating better interpretation and understanding.

Joint velocity and epsilon update

While most Full Waveform Inversion (FWI) algorithms take anisotropy into account when performing the modelling, it has been common practice to update vertical velocity only, keeping anisotropic parameters fixed during the inversion. The latest FWI methods from CGG now perform a joint update of both velocity and epsilon, thus bringing the benefits of FWI to the anisotropy model.

The deep water offshore Gabon is characterized by extreme geological complexity. BroadSeis, the CGG broadband marine solution that combines a unique marine acquisition configuration with advanced broadband imaging, captures these complex features in vivid detail as displayed in this CGG multi-client data library survey.

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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