Navegando por Assunto "CRS stack"

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Acesso aberto (Open Access)
NIP-tomografia usando método CRS e dados sísmicos marinhos
(Universidade Federal do Pará, 2013) AFONSO, João Batista Rodrigues; LEITE, Lourenildo Williame Barbosa; http://lattes.cnpq.br/8588738536047617
This work consisted on the application of techniques for processing, inversion and imaging of the Marmousoft synthetic data, and of the Jequitinhonha real data obtained on the eastern Atlantic continental shelf of the State of Bahia. The convencional NMO and CRS stack methods, and NIP-tomographic inversion were applied to the mentioned data. The NMO stack served to produce RMS and interval velocity distribution maps on the semblance domain. The CRS stack of both data we used for picking of re ection events to obtain the wave eld parameters that served to constrain the model as input for the NIP-tomographic inversion. The inversion characterizes as resulting in a smooth velocity model. Kirchhoff depth migration was used for verifying the obtained velocity models. We critically analyzed the applied techniques, and compared the CRS and the NMO stacks. The evolution of the visual quality of the obtained CRS and NMO sections were analyzed as measured by event continuity trace-by-trace and the signal/noise ratio. The di erences and improvements on the velocity model obtained by NIP-tomographic were also analyzed. The Kirchhoff prestack depth migration was applied aiming at geological interpretations, and to point out for better conditions of processing and imaging.
Acesso aberto (Open Access)
Processamento e imageamento NMO/CRS de dados sísmicos marinhos
(Universidade Federal do Pará, 2010) NUNES, Fernando Sales Martins; LEITE, Lourenildo Williame Barbosa; http://lattes.cnpq.br/8588738536047617
This work is devoted to processing and imaging of marine seismic reflection data selected from the Jequitinhonha Basin, Bahia, where two stack methods were used, the NMO-based and the CRS-based. It was also applied the CRS-partial prestack data enhancement for the densification of CMPs. Several tests were performed with these methods to optimize parameters of the stacking operators, and to improve the processing strategies. One of the efforts during processing was the attenuation of the surface-related multiple, what was attacked by applying the Radon and SRME techniques. It was also applied the densification of the data to improve the signal/noise ratio. As a conclusion, a strategy was chosen based on the comparative results of better visual and higher coherence values, having the CRS method presented superior results to the results with the NMO method, based on the visualization of reflection events that were not noticed in other sections.