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• W4285367602 abstract "ABSTRACT. To perform the velocity analysis by an inversion procedure, in which the calculated travel-times are compared to the observed ones, there is the necessity of obtaining the travel-time curve observed in the seismogram. However, obtaining the travel-time curve from a reflection event implies in a not-automated picking. Thus, in this work, we propose an automated travel-time picking technique, able to extract the travel-time curves from the target PP and PSv reflection events. Our proposed technique is based on recomposing the spectrum of frequencies of a wavelet by performing the inversion of the wave parameters, especially their amplitudes and peak frequencies. Then, the process is applied to each wavelet of a seismic trace, in which the comparison and cross-correlation among each spectrum, related to each wavelet, are performed. The process is, then, applied to each seismic trace, and, finally, the travel-time curve, related to the target reflection event, is determined. Our proposed technique shows to be effective when it is applied to reflection events from interfaces between the top of a pre-salt carbonate reservoir and the bottom of its salt structure.Keywords: automated picking, inversion, spectral recomposition.Seleção Automática de Tempos de Trânsito usando Reconstrução EspectralRESUMO. Para realizar a análise de velocidades segundo um procedimento de inversão, no qual os tempos de trânsito calculados são comparados aos observados, há a necessidade de obter-se a curva de tempos de trânsito observada no sismograma. Entretanto, obter a curva de tempos de trânsito de um evento de reflexão implica em fazer a seleção manual ou não automatizada destes tempos. Portanto, neste trabalho, uma técnica automatizada de seleção, capaz de extrair a curva de tempos de trânsito dos eventos PP e PSv alvo, é proposta. Essa técnica é baseada em reconstruir o espectro de frequências de uma ondaleta ao realizar a inversão dos parâmetros de onda, especialmente suas amplitudes e frequências dominantes. Então, o processo é aplicado para cada ondaleta de um traço sísmico, no qual a comparação e correlação cruzada entre cada espectro, relacionado a cada ondaleta, são realizadas. O processo é, então, aplicado a cada traço sísmico, e, finalmente, a curva de tempos de trânsito, relacionada ao evento de reflexão alvo, é determinada. A técnica proposta mostra efetividade, quando essa é aplicada em eventos de reflexão oriundos de interfaces entre o topo de um reservatório do pré-sal e o fundo de sua estrutura de sal.Palavras-chave: seleção automática, inversão, reconstrução espectral." @default.
• W4285367602 created "2022-07-14" @default.
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• W4285367602 date "2021-09-07" @default.
• W4285367602 modified "2023-10-07" @default.
• W4285367602 title "Automated Travel-Time Picking using Spectral Recomposition" @default.
• W4285367602 doi "https://doi.org/10.22564/rbgf.v39i3.2109" @default.
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