Noise Suppression
Different types of noise will always exist in seismic data. Noise reduces the overall data quality when the noise level is significant compared to the strength of the reflection events. PGS offers several algorithms that can be used alone or as a combination to attenuate noise. The selection of algorithms depends upon the nature and/or characteristics of the noise.
It must be noted that noise is typically generated in the near-surface of the Earth, has slow velocities, is extremely prone to aliasing, and is three-dimensional (3D) in nature. The PGS HD3D technology has been developed to explicitly addess the challenges presented by 3D noise types, and has developed a suite of processing tools to complement the production of the PGS HD3D product.
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The PGS WIPE technology effectively attenuates
ship/rig noise.
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For marine streamer seismic, our swell noise attenuation algorithm is routinely applied in the preprocessing step of most production flows. Other types of noise are interference noise from ships, rigs or other seismic activities. These noise types are typically very difficult to remove. PGS uses the SINK and WIPE technologies for these types of noise, ideally complemented by HD3D acquisition.
Incoherent noise is a significant problem for some land seismic surveys. The PGS weighted slant stack technology (NS3D) has proven superior to other well-known methods, such as FXY-deconvolution methods.
PGS also offers superior methods for the removal of guided/trapped waves.
A PGS cascaded noise-reduction flow used to remove diffracted multiples.
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