Seismic applications > Processing of a shot point

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Display of the raw shot point

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$Amplitude recovery: one can mainly see surface waves such as Rayleigh waves and direct and refracted waves$

Amplitude recovery: one can mainly see surface waves such as Rayleigh waves and direct and refracted waves

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Deconvolution: the deconvolution increases the vertical resolution and facilitates the wave separation

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Extraction of Rayleigh modes by F-K filter

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$Computation of the first residual section: one can mainly see direct wave, refracted waves and seismic waves with negative apparent velocities$

Computation of the first residual section: one can mainly see direct wave, refracted waves and seismic waves with negative apparent velocities

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Extraction of seismic waves with negative apparent velocities by F-K filter

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$Computation of the second residual section: one can mainly see refracted waves$

Computation of the second residual section: one can mainly see refracted waves

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$Extraction of refracted waves by SVD filter$

Extraction of refracted waves by SVD filter

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Computation of the third residual section: one can mainly see low apparent velocity waves and reflected waves

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Extraction of low apparent velocity waves by F-K filter : residual direct wave and surface waves

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Computation of the fourth residual section: Reflected waves and residual noise

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NMO correction with a constant velocity model (V = 2650 m/s). We can notice that the reflected waves between 0.06 and 0.08 s are under corrected

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The animation shows the processing sequence of a shot point step by step:

Step 2: Amplitude recovery: one can mainly see surface waves such as Rayleigh waves and direct and refracted waves.

Step 3: Deconvolution: the deconvolution increases the vertical resolution and facilitates the wave separation.

Step 5: Computation of the first residual section: one can mainly see direct wave, refracted waves and seismic waves with negative apparent velocities.

Step 6: Extraction of seismic waves with negative apparent velocities by F-K filter.

Step 7: Computation of the second residual section: one can mainly see refracted waves.

Step 9: Computation of the third residual section: one can mainly see low apparent velocity waves and reflected waves.

Step 10: Extraction of low apparent velocity waves by F-K filter : residual direct wave and surface waves.

Step 11: Computation of the fourth residual section: Reflected waves and residual noise.

Step 12: NMO correction with a constant velocity model (V = 2650 metres/second). We can notice that the reflected waves between 0.06 and 0.08 s are under corrected.