Method for attenuating surface wavetrains in seismic data

G - Physics – 01 – V

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G01V 1/36 (2006.01)

Patent

CA 2216042

A method for attenuating source-generated surface wavetrains in a set of seismicdata traces. According to the method, the seismic data traces are Fourier transformed with respect to time to determine the frequency components of the surface wavetrain. A phase matching operation is then performed using estimates of the wavenumbers for each of the frequency components to approximately align the surface wavetrain in the seismic data traces. Next, a spatial low-pass filter is used to remove the approximately aligned surface wavetrain. Finally, the phase matching is removed and an inverse Fourier transformation is performed to return the seismic data traces to the time domain.

Méthode d'atténuation de trains d'ondes de surface générés par une source dans un ensemble de traces de données sismiques. Dans cette méthode, on fait subir aux traces de données sismiques une transformation de Fourier par rapport au temps, afin de déterminer les composantes de fréquences du train d'ondes de surface. On exécute ensuite une opération d'adaptation de phase en utilisant des estimations des nombres d'ondes pour chacune des composantes de fréquences, afin d'obtenir un alignement approximatif du train d'ondes de surface dans les traces de données sismiques. Ensuite, on utilise un filtre spatial passe-bas pour éliminer le train d'ondes de surface à alignement approximatif. Enfin, on supprime l'adaptation de phase et on exécute une transformation de Fourier inverse pour ramener les traces de données sismiques au domaine temporel.

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