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Noise Attenuation

Clearing out the clutter is vital. Geotrace’s powerful noise attenuation techniques form the basis of our successful land and marine preprocessing operations. We’ve developed innovative, efficient methods to handle a multitude of coherent and incoherent noises, including seismic interference, swell noise, ground roll and more. These methods provide the best of all possible worlds—eliminating troublesome noise while retaining as much valuable information as possible.

Wavelet Transform Filter (WTF)
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SNIP5D: 5D semblance based method to improve signal-to-noise (s/n) ratio
A generalization of the standard semblance equation is used to develop a 5D noise elimination algorithm. It is closely related to our INT5D Multi-dimensional interpolation algorithm. The algorithm works by constructing a replacement or mixing trace from the surrounding traces, in all 5 dimensions (Inline, Crossline, Offset, Azimuth and Time) along the direction of maximum 5D semblance computed previously. The mixing of data along the strongest coherent direction tends to eliminate non-coherent noise present on one or at most a few traces. The percentage mixing between the live trace and the model trace is a user parameter.

Time Frequency Domain (TFD)
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*Original code courtesy of BP

Time Frequency Domain (TFD)
This noise-rejection technique is based on a proprietary implementation of the short Fourier transform technique. TFD allows for attenuation of anomalous amplitude spikes, noise bursts, air blast, swell noise, rig noise, pump noise, etc.

 

 

Wavelet Transform Filter (WTF)
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Wavelet Transform Filter (WTF)
This is a noise-rejection technique based on the discrete wavelet transform. In this domain, severe low-frequency linear noises contaminating the data can be separated and filtered.

 

 

 

3D FK
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3D FK
3D FK is a true three-dimensional frequency-wavenumber filter originally developed for hybrid gathers. In the 3D FK space, data is transformed to the (ω, kx, ky) space using a conical operator. Great care is taken to avoid aliasing and Gibbs effects.

 

 

 

3D Radon

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3D Radon
Using a true 3D Radon filter, which was originally developed for hybrid gathers, 3D data (x, y, z) is transformed, using the discrete Radon transform, into the (τ, px, py) space. Filtering can be done in a Model/Pass or Apply/Reject mode.

 

 



pdfMultidimensional Land Noise Elimination Technology - 5D Semblance Based Algorithms in Exploration - Theory and Practice© (Presented at EAGE, Copenhagen, Denmark, June 2012)

pdfA review of some Powerful Noise Elimination Techniques for Land Processing© (Presented at EAGE, London, UK, June 2007)

 SNIP5D - 5D Semblance based method to improve signal-to-noise (s/n) ratio

 Time Frequency Domain (TFD)
 Wavelet Transform Filter (WTF)

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