1. Graphical Answers Fresnel Zone Circles Shallow Window Deep Window
282 m pre-migration
10 m post-migration
SLIDE 21
This shows the area over which the seismic “smears” the geologic information from our last exercise
Note the 1 km scale bar
The small green circle in the upper left is the FD for the shallow zone before migration
There is a white circle in the center which is the FD after migration
The large circle on the right is the FD for the deep zone
The white circle in the center is the FD after migration
Even if the seismic reflections are fairly flat lying (horizontal), this shows the benefit of migrating the data – even though the reflctions are not repositioned very much since dips are very low
Deep Window
1900 m pre-migration
47.5 m post-migration
1 km
Courtesy of ExxonMobil
L 9 – Seismic Resolution