Wytch Farm - A reprocessing case study

Tom Massip, Phil Smith, Henna Sherazi-Selby, Alain-Christophe Bon, Gordon Roberts
2014 SEG Technical Program Expanded Abstracts 2014   unpublished
Multi survey vintage data acquired over the Wytch Farm field in Dorset (off the south coast of England) were previously processed in 2008 resulting in a Kirchhoff depth image. However, due to noise associated with shallow water and variable data quality, especially for some older 1992 and 1999 3D data, the results were sub-optimal. Recent enhancements in shallow water demultiple techniques and noise removal methods permitted a detailed re-working of the pre-processing sequence, resulting in
more » ... e, resulting in cleaner gathers with useful information at their longest offsets. These enhanced gathers were input to iterative velocity model update, using non-parametric moveout picking in conjunction with hi-resolution tomographic inversion. Subsequent Kirchhoff and beam migration produced an improved depth image from the four multi-survey input data volumes.
doi:10.1190/segam2014-0048.1 fatcat:tmz7t2hzxzbxbfp5f6ao7og3ra