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