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Dissertação
Estudo do método de empilhamento SRC e aplicação em dados sintéticos e reais
Seismic stacking is a method designed to simulate zero-offset (ZO) seismic sections from multi-coverage seismic data. The resulting simulated ZO section gives rise to a significant increase of the signal to noise ratio. This method is done by means of seismic processing socalled the common mid po...
Autor principal: | PASCHOAL JUNIOR, Waldomiro Gomes |
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Grau: | Dissertação |
Idioma: | por |
Publicado em: |
Universidade Federal do Pará
2014
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Assuntos: | |
Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5469 |
Resumo: |
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Seismic stacking is a method designed to simulate zero-offset (ZO) seismic sections from
multi-coverage seismic data. The resulting simulated ZO section gives rise to a significant
increase of the signal to noise ratio. This method is done by means of seismic processing socalled
the common mid point (CMP) method, through makes use of the so-called normal
moveout and dip moveout (NMO/DMO) corrections. In this work, a new seismic stacking
method called common reflection surface (CRS) is used to simulate ZO seismic sections. The
main characteristic of the CRS method is: 1) the use of a more general, multi-parametric stacking
operator that approximates the traveltimes of the primary reflections for sources and receiver
pairs arbitrarily located on the vicinity of the normal ray. The parameters or attributes of the
stacking operator are the radii of curvatures of two hypothetical waves called normal incidence
point (NIP) wave and normal (N) wave; as well as the emergency angle of the normal ray. The
CRS method assumes that the near-surface velocity is a priori known. To determine the abovementioned
parameters appropriately, main for the CRS imaging method, is necessary search
strategies that use cases special of the approach of second hyperbolic order of the traveltimes.
The presented search strategies are: extended-pragmatic CRS and global-local CRS. To show the
efficiency of these strategies they are applied in the synthetic Marmousi and real land datasets of
the Amazon palaeozoic basin. As result sections ZO simulated by three different stacking
methods (CMP, CRS extended- pragmatic and global-local CRS), to compare the efficiency of
these, with relationship I cost her computational and the resolution of the seismic image. |