Model‐based coherent noise attenuation for complex dispersive waves

Strobbia, Claudio; Zarkhidze, Alexander; May, Roger; Quigley, John; Bilsby, P.

doi:10.1190/1.3627942

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…For example, though again on land surveying, the use of surface wave energy (traditionally the highest amplitude 'noise' in land surveys) is now routinely used to derive near-surface model information (Strobbia et al, 2011). Notable exceptions to this are in land data with the use of shallow refraction surveys to build near-surface velocity models and long-offset refraction studies to build deeper velocity models (the refraction seismic method was briefly described in Section 11.06.2.1).…”

Section: Data and Noisementioning

confidence: 99%

Tools and Techniques: Marine Seismic Methods

Robertsson

Laws²,

Kragh³

2015

Treatise on Geophysics

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Section: Data and Noisementioning

confidence: 99%

Tools and Techniques: Marine Seismic Methods

Robertsson

Laws²,

Kragh³

2015

Treatise on Geophysics

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“…The scattering attenuation can be regarded as an extension of the model‐based coherent noise attenuation as described by Strobbia et al . () that we briefly review in the following.…”

Section: Model‐based Attenuation Of Direct and Scattered Surface Wavesmentioning

confidence: 99%

Model‐based attenuation for scattered dispersive waves

Strobbia

Zarkhidze²,

May³

et al. 2014

Geophysical Prospecting

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Coherent noise in land seismic data primarily consists in source‐generated surface‐wave modes. The component that is traditionally considered most relevant is the so‐called ground roll, consisting in surface‐wave modes propagating directly from sources to receivers. In many geological situations, near‑surface heterogeneities and discontinuities, as well as topography irregularities, diffract the surface waves and generate secondary events, which can heavily contaminate records. The diffracted and converted surface waves are often called scattered noise and can be a severe problem particularly in areas with shallow or outcropping hard lithological formations. Conventional noise attenuation techniques are not effective with scattering: they can usually address the tails but not the apices of the scattered events. Large source and receiver arrays can attenuate scattering but only in exchange for a compromise to signal fidelity and resolution. We present a model‑based technique for the scattering attenuation, based on the estimation of surface‐wave properties and on the prediction of surface waves with a complex path involving diffractions. The properties are estimated first, to produce surface‑consistent volumes of the propagation properties. Then, for all gathers to filter, we integrate the contributions of all possible diffractors, building a scattering model. The estimated scattered wavefield is then subtracted from the data. The method can work in different domains and copes with aliased surface waves. The benefits of the method are demonstrated with synthetic and real data.

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“…The noise model is finally subtracted (directly or using adaptive methods) from the data. It has been shown that the direct surface wave can be modelled and subtracted, even in the presence of spatial aliasing (Strobbia et al 2011), and we propose an extension of the method to cope with scattered surface waves…”

Section: Figure 1 A)mentioning

confidence: 99%

“…The offset and azimuth selection criterion consider the frequency-dependant properties of the surface waves: if needed, the data selection is optimised to minimize the effect of the receiver array response. The adaptive 3D aperture allows the optimal trade-off between spatial and spectral resolution (Strobbia et al 2011).…”

Section: Surface-wave Analysis Modelling and Inversion For Direct Wmentioning

confidence: 99%

Model-based Attenuation for Scattered Dispersive Waves

Strobbia¹,

Zarkhidze²,

May³

2012

Proceedings

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Coherent noise in land seismic data primarily consists of source-generated surface-wave modes. This ground roll consists of surface-wave modes propagating directly from sources to receivers. Near surface heterogeneities and discontinuities diffract the surface waves and generate secondary events, which can heavily contaminate records. The diffracted and converted surface waves are often called scattered noise and can be a severe problem particularly in areas with shallow or outcropping hard lithological formations. Conventional noise attenuation techniques are not effective with scattering: they usually can address the tails and not the apices of the scattered events. Large source and receiver arrays can attenuate scattering, but only in exchange for compromise to signal fidelity and resolution. We present a model based technique for the scattering attenuation, based on the estimation of the surfacewave properties and on the prediction of the surface waves with a complex path involving diffractions. The properties are estimated first, to produce surface consistent volumes of the propagation properties. Then, for all gathers to filter, we integrate the contributions of all possible diffractors, building a scattering model. The estimated scattered wavefield is then subtracted from the data. The method can work in different domains, and cope with aliased surface waves.

show abstract

Model‐based coherent noise attenuation for complex dispersive waves

Cited by 15 publications

References 2 publications

Tools and Techniques: Marine Seismic Methods

Tools and Techniques: Marine Seismic Methods

Model‐based attenuation for scattered dispersive waves

Model-based Attenuation for Scattered Dispersive Waves

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