A VTI example

Here we present an example of what one might expect from the analysis process discussed above. Figure  9 shows a vertical velocity ( v P 0) field in (a) and a v nmo field in (b). Because it is so similar to the vertical field the horizontal field v hor is not shown. What we know from the previous analysis is that

  vhor-   1
vP0
(5)

In this case, the ε volume is shown in Figure  11(b). Given Equation  6, we can easily solve for δ, thereby producing a complete three-dimensional volume. The result is shown in Figure  11(b).


= p1-+-2 -
(6)



Figure 9: Well and NMO Velocity Volume

(a) Estimated well velocity field PIC (b) Estimated short-spread MVA NMO velocity volume PIC




Figure 10: The η volume as estimated along with the v nmo volume using Equation  2.
PIC




Figure 11: ε and η volumes

(a) (a) The estimated ε volume. PIC (b) (b) The estimated δ volume. PIC


 
Introduction
Seismic Modeling
History
Zero Offset Migration Algorithms
Exploding Reflector Examples
Prestack Migration
Prestack Migration Examples
Data Acquisition
Migration Summary
Isotropic Velocity Analysis
Anisotropic Velocity Analysis
Case Studies
Course Summary