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. Foz do Amazonas basin is located at the northern portion of the Brazilian Equatorial Margin, along the coastal zone of Amapa and Para states. This basin has been subjected to several studies, and the presence of gas hydrates has been demonstrated locally through sampling, and over broader areas using seismic reflection data. Seismic reflection is one method to identify the occurrence of gas hydrates, as they give rise to well-marked reflectors that simulate the seafloor, known as Bottom Simulating Reflectors (BSR). This study aims to investigate BSRs associated with the presence of methane hydrates in the Foz do Amazonas Basin through the application of seismic attributes. It was compared seismic amplitudes from the seafloor and the BSR to validate the inferred seismic feature. Then, Envelope and Second Derivative were chosen for highlighting the BSR in seismic section. The results showed an inversion of polarities in the signal between the seafloor (positive polarity) and the BSR (negative polarity). The integrated use of these approaches allowed validating the level of the BSR in line 0239-0035 and inferring the presence of gas hydrates, revealing to be a useful tool for interpreting the distribution of the gas hydrates in the Foz do Amazonas Basin. Keywords: Gas hydrates, envelope, second derivative of envelope, Brazilian Equatorial Margin. RESUMO. A Bacia da Foz do Amazonas e localizada na porcao norte da Margem Equatorial Brasileira, ao longo da zona de costa dos estados do Amapa e do Para. A presenca de hidratos de gas e comprovada localmente atraves de amostragem, e em areas mais distantes atraves de dados de sismica de reflexao. A sismica de reflexao e eficaz para identificar hidratos de gas, pois refletores que simulam o fundo do mar, Bottom Simulating Reflectors (BSR), sao utilizados para inferir a presenca dos hidratos de metano. Este estudo pretende identificar feicoes sismicas associadas aos hidratos de metano na Bacia da Foz do Amazonas atraves da aplicacao de atributos sismicos. Foram comparadas as amplitudes sismicas do fundo do mar e do BSR para validar a feicao sismica inferida. Entao, os atributos Envelope e Segunda Derivada do Envelope foram escolhidos por destacarem o BSR. Os resultados mostraram uma inversao das polaridades no sinal entre o fundo do mar (positivo) e o BSR (negativo). O uso integrado dessas abordagens valida a localizacao do BSR na linha 0239-0035 e infere a ocorrencia de hidratos de gas, revelando ser uma ferramenta util para interpretacao da distribuicao de hidratos de gas na Bacia da Foz do Amazonas. Palavras-chave: Hidratos de metano, envelope, segunda derivada do envelope, Margem Equatorial Brasileira.

ANALYSIS OF SEISMIC ATTRIBUTES TO RECOGNIZE BOTTOM SIMULATING REFLECTORS IN THE FOZ DO AMAZONAS BASIN, NORTHERN BRAZIL