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L15_SeismicReflectionII-page9 - Stacking velocity Multiple...

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Applied Geophysics – Seismic reflection II Stacking velocity 2 1 0 2 2 V T x T NMO = In order to stack the waveforms we need to know the velocity. We find the velocity by trial and error: • For each velocity we calculate the hyperbolae and stack the waveforms • The correct velocity will stack the reflections on top of one another • So, we choose the velocity which produces the most power in the stack V 2 causes the waveforms to stack on top of one another Applied Geophysics – Seismic reflection II
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Unformatted text preview: Stacking velocity Multiple layer case A stack of multiple horizontal layers is a more realistic approximation to the Earth • Can trace rays through the stack using Snell’s Law (the ray parameter) • For near-normal incidence the moveout continues to be a hyperbolae • The shape of the hyperbolae is related to the time-weighted rms velocity above the reflector Î Velocity semblance spectrum Î Pick stacking velocities m u l t i p e s...
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