2014-09-102014-09-102004-04-20CRUZ, Edson Costa. Comparação dos filtros de velocidade e do operador WHLP-CRS na atenuação de múltiplas. 2004. 78 f. Dissertação (Mestrado) - Universidade Federal do Pará, Centro de Geociências, Belém, 2004. Curso de Pós-Graduação em Geofísica.https://repositorio.ufpa.br/handle/2011/5666The geological motivation of this work is the imaging of sedimentary basin structures of the Amazon region, where the generation and accumulation of hydrocarbons is related to the existence of diabase sills. The seismic motivation is the fact that these intrusive rocks present a great impedance contrast with respect to the host rock, what gives rise to external and internal multiples, with primary-like amplitudes. The seismic signal of the multiples can predominate over the primary reflection signals from deeper interfaces, making difficult the processing, interpretation and imaging of seismic sections. In this work we study the attenuation of multiples in common shot (CS) sections by the comparison of two methods. The first one is the combination of the Wiener-Hopf-Levinson (WHLP) and the common reflection surface (CRS) stacking techniques, here called WHLPCRS, where the operator is exclusively designed in the space-time domain. The second method is a velocity filter (ω-k), applied after the CRS stacking, where the operator is exclusively designed in the frequency-wavenumber domain. The identification of the multiples is performed on the zero-offset (ZO) section simulated by the CRS stacking, using the periodicity between primaries and its multiples. The wavefront attributes, obtained through CRS stacking, are inserted on movable space-time windows, used to calculate the WHLP-CRS operator. The ω-k filter calculations are performed in the frequency-wavenumber domain, where the events of interest are selected for cutting or passage. The ω-k filter is classified as a cut-off filter, with amplitude alteration and preservation of phase, the limits of it are imposed by a space-time sampling. In practical aspects we conclude that for the case of multiples, separated events on the x-t domain are not necessarily separated on the ω-k domain, which raise difficulties in the designing of a ω-k operator with a similar performance when compared to the x-t operator.porAcesso AbertoMétodo de reflexão sísmicaImageamento sísmicoEmpilhamento CRSAmazônia brasileiraDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA::GEOFISICA APLICADA