Changes

==AVO modeling==

==AVO modeling==

By using [[seismic data]] and available [[Basic open hole tools|well logs]], an understanding of the origin and nature of AVO phenomena can be realized by detailed modeling. A time match between seismic and well data can be found, along with the [[seismic wavelet]] for modeling. Then, using estimates of [[Poisson's ratio]] (empirically derived), elastic model inversions are performed to estimate a more precise Poisson's ratio.

By using [[seismic data]] and available [[Basic open hole tools|well logs]], an understanding of the origin and nature of AVO phenomena can be realized by detailed modeling. A time match between seismic and well data can be found, along with the [[seismic wavelet]] for modeling. Then, using estimates of [http://en.wikipedia.org/wiki/Poisson%27s_ratio Poisson's ratio] (empirically derived), elastic model inversions are performed to estimate a more precise Poisson's ratio.

The result of this approach applied to a gas sand problem is displayed in [[:file:amplitude-versus-offset-avo-analysis_fig5.png|Figure 5]]. The AVO anomaly at 460 msec is the resultant response to this gas sand. An alternative display of calibrated [[CDP gather]]s and matched AVO model for the same gas sand problem is shown in the variable area plot in [[:file:amplitude-versus-offset-avo-analysis_fig6.png|Figure 6]].

The result of this approach applied to a gas sand problem is displayed in [[:file:amplitude-versus-offset-avo-analysis_fig5.png|Figure 5]]. The AVO anomaly at 460 msec is the resultant response to this gas sand. An alternative display of calibrated [[CDP gather]]s and matched AVO model for the same gas sand problem is shown in the variable area plot in [[:file:amplitude-versus-offset-avo-analysis_fig6.png|Figure 6]].