Processamento de dados sísmicos marinhos de alta resolução usando sistema sparker monocanal: (plataforma da Bahia, Brasil)
Single-channel seismic data are still a challenge to apply fundamental processing techniques such as deconvolution and migration. This study proposes a workflow processing for high-resolution seismic-reflection data regarding problems of wavelet phase, low signal/noise ratio of raw data, random nois...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/43126 |
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| Resumo: | Single-channel seismic data are still a challenge to apply fundamental processing
techniques such as deconvolution and migration. This study proposes a workflow
processing for high-resolution seismic-reflection data regarding problems of wavelet
phase, low signal/noise ratio of raw data, random noise, transmission loss, static
variations, and multiples, which restrict the geological information of shallow marine
strata. The data were acquired using an Applied Acoustics Squid2000 sparker system,
operating up to 2500J, with a frequency range of 100-1200Hz. The survey was carried
out in the inner shelf of Bahia in front of the Jequitinhonha delta and aimed to investigate
Quaternary deposits and stratigraphic structures. The processing explores fundamentally
predictive deconvolution and Kirchhoff migration, and then applies techniques of static
correction, band-pass frequency, gain, and average filters as secondary techniques.
Deconvolution removed random and high-frequency noises and broadened the frequency
spectrum of the data. Kirchhoff migration collapsed the diffraction hyperbolas, enhanced
coherency, and continuity of reflectors along with the data, and repositioned dip reflectors
close to their real position. Application of static correction combined with bandpass fitter
and average filters smoothed the undulating seabed reflector and subsurface reflectors.
The results confirmed the efficiency of the processing workflow proposed here by
removing random and high-frequency noises, correcting static variations, slightly
attenuating the seabed multiple, moving reflectors to their real position, and providing a
high signal/noise ratio image that better represents the subsurface of the southern Bahia
continental shelf. |
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