Double beamforming processing in a seismic prospecting.

Pierre Boue, Philippe Roux, Michel Campillo and Benoit de Cacqueray.

Monday 29 April 2013, by briandx // Publications

Double beamforming processing in a seismic prospecting.

Pierre Boue, Philippe Roux, Michel Campillo and Benoit de Cacqueray.

In GEOPHYSICS, 78(3), V101–V108.

Abstract

The use of large number of sensors is becoming more common both at large continental scale for deep-structure in seismology and at smaller scale with exploration geophysics objectives. Seismic arrays require array processing from which new type of observables contribute to
a better understanding of the wave propagation complexity. Among these array processing techniques, this study focuses on a way to select and identify di-erent phases between two source-receiver arrays based on the Double BeamForming (DBF) method. At the exploration geophysics scale, the goal is to identify and separate low-amplitude body waves from high-amplitudes dispersive surface waves. A synthetic data set from a -nite-di-erence time-domain simulation is -rst used to validate the array processing method. From directional information obtained with DBF and due to the double-plane wave projection, it is demonstrated that surface and body waves can be extracted with a higher e-cacy compared to classical beamforming even at short o-set. A seismic prospecting data set in a laterally-heterogeneous medium is then investigated. This data set is a high-resolution survey which provides a perfect control on source and receiver arrays geometry. The separation between the direct surface and body waves is observed after DBF and ray bending is discussed from
the additional azimuthal information.

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