Akademik Veri Yönetim Sistemi
4th SEG Virtual Student Conference, 05 Mayıs 2021, ss.1, (Tam Metin Bildiri)
The suppression of the surface related multiples is a significant processing step in marine seismic data processing. Predictive deconvolution is one of the most common methods for suppressing the surface related multiples in the multichannel seismic data due to its capability to handle their complex nature. Predictive deconvolution is controlled by two main parameters, which are operator length and prediction lag. Determination of these parameters affects the predictive deconvolution results directly. Another important point that controls the methods' effectiveness is whether to apply predictive deconvolution at pre-or post-stack stages. In pre-stack shot gathers, the prediction lag parameter changes with the offset; however, it's not dependent on the offset in post-stack domain since all the reflections are NMO corrected. It is aimed to suppress the surface related multiple reflections from the 2D multichannel marine seismic reflection data, which collected by the R/V MTA SISMIK 1 in the Sea of Marmara in 1997, both at pre-and post-stack stages separately by using predictive deconvolution method, and the results compared. The stack section acquired by applying predictive deconvolution to the pre-stack shot gathers is compared with the stack section that acquired by applying predictive deconvolution to the post-stack, which has no predictive deconvolution application in pre-stack. Predictive deconvolution is observed to be suppressing the surface related multiples in both pre-and post-stack sections; however, the obtained results are significantly different. When the predictive deconvolution is applied to the pre-stack shot gathers, the surface related multiples are removed without affecting the primary reflection amplitudes. The stack section that is acquired by applying predictive deconvolution in the post-stack, which has no predictive deconvolution application in pre-stack, shows that the surface related multiples are removed but the primary reflections are also attenuated.