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1) Constant Velocity Scans

2) Radon plus KL to eliminate Radon artifacts

3) Spiking decon followed by Maximum Kurtosis Phase Correction




1) Constant Velocity Scans

A script used to compute Constant Velocity Scans for velocity analysis.

You will also need the following script:

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Constant Velocity Scans, NMO velocity increases from left to right. [scans.jpg]


2) Radon plus KL to eliminate Radon artifacts

We use Radon demultiple and the KL transform to eliminate multiples from a NMO corrected gather.
Parabolic Radon Transform: Hampson, D., 1986, Inverse velocity stacking for multiple elimination, Journal of the CSEG, vol 22, no 1., 44-55.
KL transform: Jones, I.F. and Levy, S. 1987, Signal-to-noise ratio enhancement in multichannel seismic data via the Karhunen-Loeve transform, Geophysical Prospecting 35,12-32.

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Panels from left to right: Original gather after NMO correction, Radon panel, estimated primaries (see residual energy from the multiples), estimated primaries after KL filtering, artifacts removed by the KL filter.
[radon_kl.jpg]



3) Spiking decon followed by Maximum Kurtosis Phase Correction

Spiking deconvolution followed by phase rotation and band-pass filtering were applied to a small data set from the Western Canadian Basin.

The script should reproduce the following figures:

Kurtosis vs phase rotation

After spiking deconvolution we calculate the variation of the Kurtosis with phase rotation. We choose the phase correction that maximizes the kurtosis (Longbottom, J., Walden, A.T. and White, R.E., 1988, Principles and application of maximum kurtosis phase estimation, Geophysical Prospecting, 36, 115-138)


Spectra

Spectra before and after spiking deconvolution and band-pass filtering.


Results

From left to right: Original data, data after spiking deconvolution, data after spiking deconvolution followed by maximum kurtosis phase rotation and band-pass filtering

Signal Analysis and Imaging Group
Department of Physics, University of Alberta
Edmonton, AB, T6G 2G7, Canada
Phone: (780) 492-5034 Fax: (780) 492-0714
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