Bandwidth Extension (BE®) has historically been run post-migration and it works very well, but is dependent on the imaging with conventional frequencies.
Running BE® before migration provides an increase in spatial resolution. The improvements come from three sources. First, the increase in the bandwidth pre-migration will reduce both vertical and lateral wavelets post-migration and increase both vertical and lateral resolution. Second, the sharpness of the gathers before migration allow for a much more accurate initial velocity model. This in turn allows for a more accurate stacking velocity model, which translates into a more accurate interval velocity model. Third, after migration, since the common image gathers are higher resolution, this will allow for a more accurate picking of depth errors and horizons to go into our tomographic updating software.
Needless to say, high resolution seismic coupled with high resolution velocity demands a high resolution set of migration parameters, so things like bin spacing, offset spacing, depth sample and spatial velocity sampling for updating need to be revisited after BE®. The resulting image will provide a better representation of the subsurface structure and stratigraphy.Flow:
BE® Imaging Input Data Requirements
Required Header Information:
Multi-dimensional high resolution imaging for accurate interpretation and reservoir characterization© (presented at SEG, Las Vegas, Nevada, USA, November 2012)
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