The Impact Of Estimated Temporal And Spatial Variability Of Water Layer Velocity On The Correction Of OBS Data Expanded
The impact of estimated temporal and spatial variability of water layer velocity on the correction of OBS data (Expanded)
Year: 2023First Published: IMAGEAuthors: Peter Scholtz*, Truong Nguyen and Arash JafarGandomi
Corrections 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 the node locations. The main novel parts in the process are using a non-linear clock-drift correction term, using a higher-order polynomial model for the vertical profile of water-velocity and an enhanced data pre-conditioning for optimization. A real data example confirms the success of the approach.