Made available in DSpace on 2014-12-17T14:08:40Z (GMT). No. of bitstreams: 1 FelipeZA_DISSERT.PDF: 5156580 bytes, checksum: cf88acbbf99c9d93a555a758d3e21bf5 (MD5) Previous issue date: 2010-10-23 / The seismic processing technique has the main objective to provide adequate picture of geological structures from subsurface of sedimentary basins. Among the key steps of this process is the enhancement of seismic reflections by filtering unwanted signals, called seismic noise, the improvement of signals of interest and the application of imaging procedures. The seismic noise may appear random or coherent. This dissertation will present a technique to attenuate coherent noise, such as ground roll and multiple reflections, based on Empirical Mode Decomposition method. This method will be applied to decompose the seismic trace into Intrinsic Mode Functions. These functions have the properties of being symmetric, with local mean equals zero and the same number of zero-crossing and extremes. The developed technique was tested on synthetic and real data, and the results were considered encouraging / O processamento s?smico tem como principal objetivo fornecer imagem adequada das estruturas geol?gicas da sub-superf?cie de bacias sedimentares. Dentre as etapas fundamentais deste processamento est? o enriquecimento das reflex?es s?smicas atrav?s de filtragem de sinais indesej?veis, chamados de ru?dos, a amplifica??o de sinais de interesse e a aplica??o de processos de imageamento. Os ru?dos s?smicos podem aparecer de forma aleat?ria ou coerente. Nesta disserta??o ser? apresentado uma t?cnica para atenuar ru?dos coerentes, como o ground roll e as reflex?es m?ltiplas, baseado na Decomposi??o em Modos Emp?ricos. Este m?todo consiste em decompor o tra?o s?smico em Fun??es de Modo Intr?nseco, que s?o fun??es sim?tricas com m?dia local igual a zero e mesmo n?mero de zeros e extremos. A t?cnica desenvolvida foi testado em dados sint?ticos e reais, e os resultados obtidos foram considerados encorajadores