Adaptive Polarization Filtering
Surface-Wave Attenuation for 3C Data
Adaptive Polarization Filtering takes advantage of the full vector particle motion recorded by three-component sensors to provide excellent discrimination and attenuation of surface waves. It is more effective than single-component techniques and can remove high-amplitude aliased ground roll while preserving the underlying P- and S-wave arrivals. The filtering specifically targets the surface-wave noise cone making it efficient, accurate and ensuring amplitude preservation outside of this zone.
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Vertical component shot gathers (above) from an onshore 3C-3D survey contaminated with high-amplitude ground roll energy in a cone centred on the shotpoint. After Adaptive Polarization Filtering (APF) the ground roll noise cone is removed without damaging the underlying P-wave arrivals.
FEATURES
- Automatic detection of surface-wave noise cone
- Adaptive filters estimate and subtract surface-wave energy
- Optimal use of full-bandwidth 3C data for 3C noise attenuation
- Filtering localised to surface-wave noise cone
- Applications for:
- 3C Land ground roll
- OBC mud roll
BENEFITS
- Superior attenuation of aliased surface-wave energy
- Preserves P- and S-wave amplitudes
- Preserves vector fidelity of 3C data
- Recovers near-offset data from inside the noise cone for inversion and interpolation applications
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A vertical component near-offset stack heavily contaminated by ground roll is shown above. In cases such as this where the contamination is very heavy and associated with scattered noise, polarization filtering can be combined with localized FK coherent noise attenuation to provide more effective removal of the more complex noise cone.
The near-offset stack image above is composed mainly of P-wave data recovered from inside the ground roll noise cone.
