Superior noise attenuation enabled by single-sensor technology

Single-sensor recording overcomes many of the limitations of analog summation within conventional acquisition arrays. For example, at long offsets, traditional hydrophone arrays can act as a spatial filter and attenuate signals arriving along nonvertical raypaths. However, targeted noise attenuation within a digital group forming (DGF) workflow can more effectively remove environmental effects such as marine swell noise.

Lacona is one approach WesternGeco offers to pre-DGF noise attenuation. The filter is adaptive in those parts of f-k space that are occupied by noise components while having no effect in areas where signal is present. Variations in the amplitude and phase characteristics of individual detectors are corrected before DGF.

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Pre–Digital Group Forming Noise Attenuation

Typical Lacona filter response
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