L15_SeismicReflectionII-page8

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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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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