AVO Compliant Processing

Preservation of relative amplitude information is critical for many downstream applications such as AVO, LMR, and azimuthal AVO (see our Reservoir Analysis Group for a description of these services and many more). Arcis' AVO compliant processing flow contains a strong suite of tools, from linear noise attenuation through to prestack migration, which collectively provide robust noise attenuation and good imaging without distortion of primary reflection energy. The figures below illustrate our AVO-friendly linear noise attenuation scheme. The rightmost pane in Figure 1 shows the result of applying an industry-standard ground roll reduction technique (low frequency array-forming in this case) to the noisy 2D shot shown in the middle pane. While the overall result is satisfactory from the viewpoint of noise suppression, some remnant signal is observed in the difference plot (leftmost pane) as shown by the blue ellipses. Such signal leakage distorts relative amplitude information and is therefore undesirable in AVO processing. Figure 2 shows the result of an AVO-friendly linear noise suppression loop in which the same linear noise attenuation algorithm is used in conjunction with an adaptive signal addback scheme. In this case the difference plot (left pane) shows no remnant signal.

 

LandPro - NotAVO

Figure 1: Ground roll suppression via conventional processing.
Middle: input; Right: output; Left: difference between input and output.

 

LandPro - AVO

Figure 2: Ground roll suppression via AVO compliant processing.
Middle: input; Right: output; Left: difference between input and output.

 

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