Deconvolution tests with deep water experimental data from Campos basin, Brazil

Rosa, Andre Luiz Romanelli; Schinelli, Marco

doi:10.1190/1.1892578

Cited by 4 publications

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“…Cada fonte sísmica possui um espectro de emissão característico para o pulso gerado, conhecido por assinatura sísmica. De acordo com Rosa et al (1985), esta assinatura está relacionada ainda a outros fatores como o registrador, o hidrofone, os fantasmas da fonte e dos hidrofones, seus arranjos, o meio de propagação da onda e as características intrínsecas ao próprio pulso sísmico gerado. Durante o processamento, a PETROBRAS calculou o operador matemático utilizado para a deconvolução específica da fonte utilizada, processo pelo qual as frequências relacionadas à assinatura da fonte são eliminadas do sinal sísmico.…”

Section: Deconvolução Para Remoção Da Assinatura Da Fonteunclassified

Análise sismoestratigráfica das bacias de Barreirinhas e do Ceará como ferramenta para estudos paleoceanográficos no Cenozoico na Margem Equatorial Brasileira

Alves¹

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The Brazilian Equatorial Margin (BEM) is an area of extreme importance for the paloceanography and paleoclimatology of the South Atlantic although still with a wide field for research. The scope of this work is improve the comprehension of this important region, with the paleoceanographic interpretation for the sedimentary evolution of the Ceará and Barreirinhas basins in the Cenozoic through a seismic stratigraphic approach. Multichannel seismic lines and bore hole geophysical data were analyzed to the construction of a depositional model for both basins. This model was created using seismic stratigraphy and horizon mapping techniques. As results, five chronostratigraphical markers were identified and two distinct phases defined: (1) Paleogene and (2) Neogene + Quaternary. During the Paleogene, the sedimentation became more controlled by marine influence, developing in a time of warm and humid climate and surface and bottom currents still incipient. During the Neogene and Quaternary, the North Brazil Current (NBC) and the Deep Western Boundary Current became more important in the sediment transport, erosion and rework in the BEM. During this period, it was also possible to identify the climatic changes effect on the sediment supply for both basins, and also the paleocirculation variations, especially with the weakening of the NBC and the Atlantic Meridional Overturning Circulation.

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Section: Deconvolução Para Remoção Da Assinatura Da Fonteunclassified

Análise sismoestratigráfica das bacias de Barreirinhas e do Ceará como ferramenta para estudos paleoceanográficos no Cenozoico na Margem Equatorial Brasileira

Alves¹

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Processing via spectral modeling

Rosa

Ulrych

1991

GEOPHYSICS

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The widespread occurrence of subtle trap accumulations offshore Brazil has led to the need for the development of a high resolution processing scheme that helps the delineation of these features. The process consists of three stages, the first of which is deterministic and stochastic deconvolution. The second stage is the deconvolution of the residual wavelet by means of spectral modeling. The last stage consists of the correction of the color of the reflectivity function using a model developed for the area. An important conclusion that is drawn from the model is that the acoustic impedance is not white. Rather it is as red as the corresponding reflectivity is blue. Successful results from the application of the proposed technique to real data indicate that the color compensation is of second order importance as compared with the first two stages of the proposed scheme.

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2018

The Seismic Signal and Its Meaning

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Deconvolution tests with deep water experimental data from Campos basin, Brazil

Cited by 4 publications

References 0 publications

Análise sismoestratigráfica das bacias de Barreirinhas e do Ceará como ferramenta para estudos paleoceanográficos no Cenozoico na Margem Equatorial Brasileira

Análise sismoestratigráfica das bacias de Barreirinhas e do Ceará como ferramenta para estudos paleoceanográficos no Cenozoico na Margem Equatorial Brasileira

Processing via spectral modeling

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