Identification and analysis of bottom simulating reflectors in the Foz do Amazonas Basin, Northern Brazil
| Autor: | Laisa da Fonseca Aguiar, Antonio Fernando Menezes Freire, Cleverson Guizan Silva, Wagner Moreira Lupinacci |
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| Jazyk: | English<br />Spanish; Castilian<br />French<br />Portuguese |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Brazilian Journal of Geology, Vol 51, Iss 1 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2317-4692 2317-4889 |
| DOI: | 10.1590/2317-4889202120200075 |
| Popis: | Abstract This work proposed an additional approach to investigate gas hydrate occurrences in the Foz do Amazonas Basin, in the Brazilian Equatorial Margin. The automatic comparison of seafloor seismic amplitudes with those from the Bottom Simulating Reflectors (BSR) was used to exhibit the reversal of signal polarities among the seafloor (positive) and the BSR (negative), reinforcing the identification of BSR in areas where its visualization was unclear. Additionally, we used the envelope attribute to highlight the BSR in the seismic section. Subsequently, we decomposed the seismic data into different frequency bands, applied a -90 degrees phase rotation to the data and recalculated the envelope attribute for each section decomposed in frequency bands. This technique improved visualization, allowing the identification of intervals where BSR were laterally discontinuous, revealing to be valuable for mapping the gas hydrate distribution in Foz do Amazonas Basin. |
| Databáze: | Directory of Open Access Journals |
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