Attenuation of receiver ghosts in variable-depth streamer high-resolution seismic reflection data
Attenuation of receiver ghosts in variable-depth streamer high-resolution seismic reflection data
Receiver ghosts attenuate marine seismic reflection data at harmonic frequencies that depend on the propagation angle and the streamer depth below the sea surface. The resulting loss of bandwidth is one of the major factors hampering seismic resolution. In near-surface and legacy multi-channel data, receivers depth is often unknown and may vary significantly both along the streamer length and during the survey, making frequency-slowness deghosting techniques unsuitable. In this work, we present a method for the attenuation of receiver ghost ref l ections in data with an arbitrary streamer depth profile varying during the survey. For each trace, a different deghosting operator is estimated and applied at different two-way-time windows, in order to account for depth-dependent changes in reflection angles. The ghost null frequencies are picked on the time-varying power spectrum via an automatic algorithm, guided by a user-dependent a priori function, and optimised to respect the harmonics’ periodicity. The power of the inverse filter is adjusted by adaptively damping abnormal amplitudes in the deghosted spectra. The algorithm is applied to high-resolution (GI-gun, 20-400 Hz) and ultra-high-resolution (Sparker, 0.2-3.0 kHz) multi-channel datasets, yielding an excellent bandwidth recovery and gain in resolution in the final stacks. Limited computing time and straightforward application make the method widely applicable and cost-effective.
High-resolution geophysics, Inverse problems, Seismic reflection data, Seismic resolution, Signal processing
Provenzano, Giuseppe
0da03494-44a8-4536-8833-6cd4feb75882
Henstock, Timothy
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Bayrakci, Gaye
0f436a50-6297-4ed1-9c12-797f16cbc9c4
1 June 2020
Provenzano, Giuseppe
0da03494-44a8-4536-8833-6cd4feb75882
Henstock, Timothy
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Bull, Jonathan
974037fd-544b-458f-98cc-ce8eca89e3c8
Bayrakci, Gaye
0f436a50-6297-4ed1-9c12-797f16cbc9c4
Provenzano, Giuseppe, Henstock, Timothy, Bull, Jonathan and Bayrakci, Gaye
(2020)
Attenuation of receiver ghosts in variable-depth streamer high-resolution seismic reflection data.
Marine Geophysical Researches, 41 (2), [11].
(doi:10.1007/s11001-020-09407-9).
Abstract
Receiver ghosts attenuate marine seismic reflection data at harmonic frequencies that depend on the propagation angle and the streamer depth below the sea surface. The resulting loss of bandwidth is one of the major factors hampering seismic resolution. In near-surface and legacy multi-channel data, receivers depth is often unknown and may vary significantly both along the streamer length and during the survey, making frequency-slowness deghosting techniques unsuitable. In this work, we present a method for the attenuation of receiver ghost ref l ections in data with an arbitrary streamer depth profile varying during the survey. For each trace, a different deghosting operator is estimated and applied at different two-way-time windows, in order to account for depth-dependent changes in reflection angles. The ghost null frequencies are picked on the time-varying power spectrum via an automatic algorithm, guided by a user-dependent a priori function, and optimised to respect the harmonics’ periodicity. The power of the inverse filter is adjusted by adaptively damping abnormal amplitudes in the deghosted spectra. The algorithm is applied to high-resolution (GI-gun, 20-400 Hz) and ultra-high-resolution (Sparker, 0.2-3.0 kHz) multi-channel datasets, yielding an excellent bandwidth recovery and gain in resolution in the final stacks. Limited computing time and straightforward application make the method widely applicable and cost-effective.
Text
mgrpaper_rev1_clean
- Accepted Manuscript
More information
Accepted/In Press date: 17 March 2020
e-pub ahead of print date: 6 April 2020
Published date: 1 June 2020
Additional Information:
Funding Information:
Funding was provided by the NERC Project CHIMNEY (Characterisation of Major Overburden Leakage Pathways above Sub-sea Floor CO 2 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{2}$$\end{document} Storage Reservoirs in the North Sea), and the European Unions Horizon 2020 Research and Innovation Programme under the Grant Agreement Number 654462 (STEMM-CCS). The authors wish to thank the crew of the JC152 cruise for acquiring the seismic data, TTS Ltd. for providing the digital streamer GeoEel, and Mark E. Vardy of SAND Geophysics Ltd. for the useful discussion regarding marine seismic processing. Finally, the authors thank two anonymous reviewers and Jared Kluesner for the insightful comments, which contributed to complete and improve the manuscript. Seismic imaging is performed in ProMax™. The streamer depth estimation and deghosting algorithms presented in this work are developed in Matlab™language. The function to locate function minima is authored by Carlos Adrian Vargas Aguilera, and the one used for the direct and inverse short-time Fourier transform has been published as Zhivomirov ( 2019 ).
Publisher Copyright:
© 2020, The Author(s).
Keywords:
High-resolution geophysics, Inverse problems, Seismic reflection data, Seismic resolution, Signal processing
Identifiers
Local EPrints ID: 438857
URI: http://eprints.soton.ac.uk/id/eprint/438857
ISSN: 0025-3235
PURE UUID: 293209f1-dcf1-4906-8ff5-97f03dbc1004
Catalogue record
Date deposited: 25 Mar 2020 17:32
Last modified: 17 Mar 2024 05:25
Export record
Altmetrics
Contributors
Author:
Giuseppe Provenzano
Author:
Gaye Bayrakci
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
