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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
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.
0025-3235
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
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. (doi:10.1007/s11001-020-09407-9).

Record type: Article

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.

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More information

Accepted/In Press date: 17 March 2020
e-pub ahead of print date: 6 April 2020

Identifiers

Local EPrints ID: 438857
URI: http://eprints.soton.ac.uk/id/eprint/438857
ISSN: 0025-3235
PURE UUID: 293209f1-dcf1-4906-8ff5-97f03dbc1004
ORCID for Timothy Henstock: ORCID iD orcid.org/0000-0002-2132-2514

Catalogue record

Date deposited: 25 Mar 2020 17:32
Last modified: 07 Oct 2020 01:44

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Contributors

Author: Giuseppe Provenzano
Author: Jonathan Bull
Author: Gaye Bayrakci

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