Depth Velocity Model Building Starting with Well-Focused Time Migrated Data - A 3D North Sea Case Study

A new advanced tomographic toolbox provides a step change for time and depth velocity model building in terms of flexibility and robustness. We introduce a new accurate workflow combining benefits from time to depth workflow and multi-layer non-linear slope tomography for improving imaging quality and reducing the turnaround time of a depth imaging project when time migrated data are available. We present an offshore North Sea 3D case study which exhibits typical processing challenges such as interbed multiples removal, channel imaging issues and velocity model building in the presence of high velocity contrasts.