### Flat and floating datum corrections, why and when?

Posted:

**Thu Nov 19, 2020 6:31 am**Hi every body, I hope you all are safe and healthy in this Covid19 situation!

I may have a problem in understanding the application of flat and floating datum corrections in seismic data processing.

I know that, we use the flat datum correction because the hyperbolic assumption is true if sources and receivers be on a flat surface. So, in case of topography, we compensate this elevation differences at sources and receivers positions by moving them to a flat datum. On the other hand, we use the floating datum, a smooth version of topography, for processing, velocity analysis and migration.

My question is that why we choose the floating datum for processing instead of the flat datum, while the hyperbolic assumption is valid for the flat datum?

For the interpretation step, the final stack sections to be used, are on flat datum, right? If so, why is that? Don't they need the true topography? The floating datum isn't a better approximation of the topography?

I may have a problem in understanding the application of flat and floating datum corrections in seismic data processing.

I know that, we use the flat datum correction because the hyperbolic assumption is true if sources and receivers be on a flat surface. So, in case of topography, we compensate this elevation differences at sources and receivers positions by moving them to a flat datum. On the other hand, we use the floating datum, a smooth version of topography, for processing, velocity analysis and migration.

My question is that why we choose the floating datum for processing instead of the flat datum, while the hyperbolic assumption is valid for the flat datum?

For the interpretation step, the final stack sections to be used, are on flat datum, right? If so, why is that? Don't they need the true topography? The floating datum isn't a better approximation of the topography?