Abstract
Seismic data are usually contaminated with random and coherent noise. This noise prevents the accurate imaging of seismic sections and lead to mistakes in their interpretations. The main objective of this research was to perform noise reduction for post-stack seismic data from the Rabeh East Oil Field, southern Gulf of Suez Basin. This will help in obtaining seismic sections of better quality for the petroleum exploration process. The technique was applied to 20 seismic lines in the study area to improve the seismic imaging and increase the signal-to-noise ratio and thus obtain more accurate interpretations. The designed processing sequence included a step for reducing noise from random sources using deconvolution. Deconvolution was applied after the stack to decrease reverberations and short-period multiples and to recover high frequencies that common midpoint (CMP) stacking attenuates. The resulting sections showed significant improvements in vertical resolution, sharpness, and continuity, yielding better-characterized reflectors. The noise at high and low frequencies was subsequently eliminated using band-pass filtering. The Ormsby filter was applied to optimize the ratio of signal to noise to a good extent. Display gain was then applied. Time-variant scaling was avoided for the stacked amplitudes to preserve the real amplitudes; instead, automatic gain control, which amplifies weak reflections, was used. Accordingly, previously interpreted subsurface structures can be more precisely delineated and identified when the prior methodology is applied to the original seismic data of the Rabeh East Field.
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The seismic data in the present work is confidential.
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The authors are grateful to the EGPC and Ganoub El-Wadi Petroleum Company, who provided the geophysical data used in this work.
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Ewida, H.F., Sarhan, M.A. Seismic noise attenuation using post-stack processing: a case study of Rabeh East Oil Field, Gulf of Suez Basin, Egypt. Euro-Mediterr J Environ Integr 8, 645–664 (2023). https://doi.org/10.1007/s41207-023-00390-2
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DOI: https://doi.org/10.1007/s41207-023-00390-2