Lacona Noise Attenuation Technique | Schlumberger

Lacona

Noise attenuation technique 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 more effectively removes environmental effects such as marine swell noise.

Lacona is one approach we offer before DGF noise attenuation. The filter is adaptive in the parts of f-k space 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.

Lacona filter response.
Lacona employs data-adaptive filters that vary from record to record. This example demonstrates the subtle differences in filter response from one shot record to the next.
Lacona filter response.

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