Angle-domain CIG and AVA

Angle-domain CIG can also be used to analyze the reflectivity as a function of the reflection angle to estimate rock and fluid properties in the subsurface. This potential use is illustrated by the gathers shown in Figure 8. The left panel shows an angle-domain CIG gather while the right panel shows the corresponding offset-domain CIG gather obtained by an amplitude preserving Kirchhoff migration Ecker et al. (1996). The amplitude behavior as a function of offset ray parameter (left panel) is in qualitative agreement with the the amplitude behavior as a function of offset (right panel).

 

AVO-hydrate-angle-kir
Figure 8 Left: Angle-domain CIG obtain by wave-equation migration. Right: Offset-domain CIG gather obtained by Kirchhoff migration