--> ABSTRACT: Model-Based Coherent Noise Attenuation for Complex Dispersive Waves, by Strobbia, Claudio L.; Zarkhidze, Alexander; May, Roger; Quigley, John; Bilsby, Phillip; #90141 (2012)
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Model-Based Coherent Previous HitNoiseNext Hit Attenuation for Complex Dispersive Waves

Strobbia, Claudio L.*1; Zarkhidze, Alexander 1; May, Roger 2; Quigley, John 3; Bilsby, Phillip 3
(1) WesternGeco, Cairo, Egypt. (2) WesternGeco, Dubai, United Arab Emirates. (3) WesternGeco, London, United Kingdom.

The attenuation of source-generated coherent Previous HitnoiseNext Hit energy can be a challenging problem for land data where surface waves often exhibit complex behavior with multiple propagation modes, high lateral variability and relatively short wavelengths. The traditional acquisition and processing strategy for mitigation of coherent Previous HitnoiseNext Hit has combined analog spatial filtering through source and receiver arrays in the field, with multi-channel digital filtering in data processing. The field arrays act as complementary spatial anti-alias filters for data processing algorithms which have difficulty in dealing with aliased events. Limitations of the available processing procedures place constraints on the acquisition design which can potentially both limit flexibility and increase the cost of the acquisition.

We present here a new model-based approach to source-generated coherent Previous HitnoiseNext Hit attenuation: an improved understanding of the near-surface forms the core of an integrated workflow aiming at the near-surface perturbation correction and Previous HitnoiseNext Hit attenuation. The analysis of coherent Previous HitnoiseNext Hit and the extraction of a surface-consistent distribution of Previous HitnoiseNext Hit properties are used first for characterizing the near-surface. Then the Previous HitnoiseNext Hit properties are used for the Previous HitnoiseNext Hit removal, generating a detailed model of the surface wave Previous HitnoiseNext Hit, Previous HitspatiallyNext Hit variable over the survey area, which can be subtracted from data.

Significant advantages of this approach are the ability to deal with large spatial variability of the Previous HitnoiseNext Hit properties, spatial irregularity of the acquisition geometry, and a relaxation of the effective spatial sampling required in the field to handle coherent Previous HitnoiseNext Hit aliasing in a robust way.

The model based Previous HitnoiseNext Hit attenuation does not rely on multichannel filters and can effectively address Previous HitspatiallyNext Hit aliased surface waves, even in laterally varying media. The development of robust aliased Previous HitnoiseNext Hit attenuation has particular relevance for survey design and acquisition economics since it allows some relaxation of the sampling criteria for coherent Previous HitnoiseTop in the field and supports the use of ‘array-less’ point-source and point-receiver acquisition, with elimination of anisotropic array effects in the acquired data.

 

AAPG Search and Discovery Article #90141©2012, GEO-2012, 10th Middle East Geosciences Conference and Exhibition, 4-7 March 2012, Manama, Bahrain