The key practical aspects of 3D tomography: data picking and model representation

There are a wide variety of approaches to building velocity models with prestack depth<br>migration. The most common pitfalls we see in them are extracting reliable yet detailed<br>information about velocity errors from migrated data and then the inability to produce<br>geologically reasonable velocity models from these error estimates. We extract detailed error<br>estimates along horizons from finely sampled migrated data, edit them statistically, and QC<br>the edits in map view. Tomography converts these error estimates into new velocity models or<br>velocity model updates using a flexible model building system.