Improvement of Gulf of Suez subsurface image under the salt layers through re-processing of seismic data- a case study

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Abstract

Advanced technology in processing the old seismic data in the Gulf of Suez (G.O.S) has been used and applied using new parameters to emphasise the optimisation of geological structures and stratigraphic units as much as possible. The primary reflections in Gulf of Suez have low frequency while multiple reflections have higher frequency where there is a high reflection contrast in the shallow section represented by Zeit Formation due to alternation of shale and anhydrite that generates a lot of multiple reflections. The deeper formations will be affected by low-frequency reflections resulted from the incident energy itself with the common attenuation parameters such as transmission loss, adsorption, and spherical spreading of waves. Otherwise, the data in the Gulf of Suez suffer from a lot of loss mechanism from the salt of South Gharib Formation and anhydrite of Zeit Formation. In this study, new software are adapted to apply new technology in processing and analysis of seismic data such as VISTA 11 software from GEDCO company. After a lot of iterations of all seismic data parameters, seismic flows and parameters have been chosen to retain the primary frequency contents and relative amplitude while suppressing multiples energy. The reprocessing produced seismic sections with the increased temporal and spatial seismic resolution, facilitating more accurate interpretation of the data. Enhanced imaging of both the salt structures and the sub-salt sequence has been achieved, which in turn leads to a more and better understanding of salt deformation and improve the mapping of structural subdivisions within the study area.

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NRIAG Journal of Astronomy and Geophysics
Volume 9, Issue 1
January 2020
Pages 38-51

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