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Deghosting through Notches Using Echo Deblending – Synthetic and Field Data Examples
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Ghosts are interference events caused by the free-surface that impact the bandwidth and the resolution of the data negatively. Echo Deblending is a wave-equation based method to remove the ghosts events present in marine seismic data. Unlike other deghosting methods, Echo deblending aims to separate the reflection events of interest from their ghosts by noting that the ghosts are produced by (virtual) secondary sources that have been generated by the free-surface. Treating ghosts as secondary source events, source- and receiver ghosts can be separated by utilizing deblending techniques. In this paper, Echo-deblending is successfully applied to selected synthetic data sets to verify and compare performance, as well as to a 3D field data set. A modification of the method named coincidence filtering is introduced to improve the robustness of the method by utilizing travel-time matching together with amplitude thresholding during the deblending. It is demonstrated that the 3D Echo deblending is capable of producing satisfactory results, also in the presence of noise and acquisition-related uncertainties. This is a clear advantage over inversion-based methods that are more sensitive to noise present in the data.