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L15_SeismicReflectionII-page8 - Normal move out(NMO...

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Applied Geophysics – Seismic reflection II Velocity analysis Determination of seismic velocity is key to seismic methods Velocity is needed to convert the time-sections into depth-sections i.e. geological cross-sections Unfortunately reflection surveys are not very sensitive to velocity Often complimentary refraction surveys are conducted to provide better estimates of velocity Applied Geophysics – Seismic reflection II
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Unformatted text preview: Normal move out (NMO) correction reflection hyperbolae become fatter with depth (i.e. velocity) 1 2 2 2 V x T T x + = The reflection traveltime equation predicts a hyperbolic shape to reflections in a CMP gather. The hyperbolae become fatter/flatter with increasing velocity 2 1 2 2 V T x T NMO ≈ ∆ We want to subtract the NMO correction from the common depth point gather But for that we need velocity…...
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