L15_SeismicReflectionII-page11

# L15_SeismicReflectionII-page11 - α 1 = 3 km/s z = 5 km 4...

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Applied Geophysics – Seismic reflection II Velocity sensitivity: Example Deep : Two layer model: α 1 = 6 km/s, z = 20 km 4 400 3 1 4 2 2 2 2 1 x x z t + = + = α 480 2 2 0 2 1 2 x t x t NMO = = Equation of the reflection hyperbolae: Normal move out correction: For a 5 km offset: α 1 = 6.0 km/s then 0.052 sec – correct value α 1 = 5.5 km/s then 0.062 sec α 1 = 6.5 km/s then 0.044 sec Are these significant differences? What can we do to improve velocity resolution? Shallow : Two layer model:
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Unformatted text preview: α 1 = 3 km/s, z = 5 km 4 25 5 . 1 1 2 x t + = 60 2 x t NMO = ∆ For a 5 km offset: α 1 = 3.0 km/s then 0.417 sec α 1 = 2.5 km/s then 0.600 sec α 1 = 3.5 km/s then 0.306 sec Applied Geophysics – Seismic reflection II Frequency filtering Hi-pass : to remove ground roll Low-pass : to remove high frequency jitter/noise Notch filter : to remove single frequency...
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