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Communication Dans Un Congrès Année : 2004

Theoretical analysis of a directional source for four-dimensional seismic monitoring

Résumé

The aim of four dimensional seismic monitoring is to monitor the changes in the subsurface in time; to achieve this, measurements are continuously repeated with the same space configuration. Reliability and repeatability of the acquisition footprint are thus key requirements for four dimensional surveys. The weathered zone (WZ) is the main cause of source signal fluctuations, polluting the signal coming from reservoir variations. This zone is directly located beneath the surface and its mechanical properties vary with weather. To eliminate this perturbation, a directional source, buried under the WZ and radiating downwards, is analyzed here. Assuming that the source size to wavelength ratio is small, a model is developed for the directional source buried in a layered half space: the Green’s tensor in a layer is calculated using the discrete wavenumber method [M. Bouchon, Bull. Seismol. Soc. Am. 71(4), 959‐971 (1981)] and the solution is then propagated using the reflectivity method [J. Muller, Geophysics 58, 153–174 (1985)]. Using a typical seismic signal called Ricker, synthetic seismograms are computed for the directional source buried in a half space covered by a layer (the WZ). The obtained results validate the directional source concept. [Work supported by an I.F.P. grant.]
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Dates et versions

hal-00133875 , version 1 (28-02-2007)

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Madjid Berraki, Bertrand Dubus, Axelle Baroni. Theoretical analysis of a directional source for four-dimensional seismic monitoring. 148th Acoustical Society of America Meeting, Nov 2004, San Diego, CA, United States. ⟨10.1121/1.4784953⟩. ⟨hal-00133875⟩
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