The Impact Of Estimated Temporal And Spatial Variability Of Water Layer Velocity On The Correction Of OBS Data

Summary

Correcting for source and receiver positioning and clock-drift errors are early steps in the processing of ocean bottom seismic (OBS) data. We have implemented an optimization process to correct jointly for these errors, while a water velocity model gets updated from an initial uniform estimate to a final time- and depth-dependent version at node locations. The main novel part in the process is using a non-linear clock-drift correction term and enhanced data pre-conditioning for optimization. A real data example confirms the success of the approach.