AVO Conditioning

Conditions angle band stacks prior to performing AVO analysis

Prior to performing AVO Inversion, the offset or angle bands are analyzed for optimum flattening and alignment. The amplitude and phase spectra of the embedded seismic wavelet are equalized across CIP/CMP or angle gathers. This compensates for differential Q attenuation and NMO-induced wavelet stretch across the gathers.

Alignment of angle bands is performed by generating 3D displacement vector fields using non-rigid matching (NRM) and vertical seismic scaling (VSS). The smoothed displacement fields are used to generate a locally varying matching function that allows the angles bands to be more accurately aligned to each other, and hence, lead to more reliable AVO analysis and more robust estimates of intercept and gradient. This method is unique and has significant advantages over conventional methods of 'event flattening' using trim or residual statics because of the subsample/voxel precision and control over the displacement field parameterization.

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