Schlumberger

Technical Paper: 3D Full Waveform Inversion on a Gulf of Mexico WAZ Data Set

Society: SEG
Paper Number: 0957
Presentation Date: 2010
 

In the last few years there has been an emphasis on using Full waveform inversion (FWI) in the real data environment. While the geological settings have been different, the common scheme was to use data sets that have relatively large cross-line offsets and frequencies as low as 2.5 Hz. These measurements are the result of Wide azimuth (WAZ) towed streamer or Ocean Bottom Cable acquisition. These data acquisition methods offer better illumination, noise attenuation and lower frequencies to more accurately determine a velocity field for imaging.

The methodology in this paper follows the layer striping approach where we developed the supra salt sediment followed by the top of salt, salt flanks, base of salt and finished with a limited subsalt update. The inversion stages were carefully QC-ed through gather displays to ensure that the kinematics were honored. To approximate the observed data, the acoustic inversion had attenuation, anisotropy, acquisition source and receiver depth incorporated in the propagator. The final results were validated by reverse time migration using the inverted velocity field versus the final tomography velocity regime.

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