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vol.78 número3Paleomagnetic constraints on the age of the Botucatu Formation in Rio Grande do Sul, southern Brazil índice de autoresíndice de assuntospesquisa de artigos
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Anais da Academia Brasileira de Ciências

versão impressa ISSN 0001-3765versão On-line ISSN 1678-2690

Resumo

WESCHENFELDER, Jair et al. Shallow gas accumulation in sediments of the Patos Lagoon, southern Brazil. An. Acad. Bras. Ciênc. [online]. 2006, vol.78, n.3, pp.607-614. ISSN 0001-3765.  http://dx.doi.org/10.1590/S0001-37652006000300017.

A high resolution seismic survey was conducted in the Patos Lagoon, southern Brazil, aboard of the research vessel LARUS of the Fundação Universidade Federal do Rio Grande (FURG). Around 400 km of 3.5 kHz seismic profiles were collected, which provided acoustic signals of good penetration depth and resolution. Seismic anomalies, including turbidity and pocket gas, revealed that gas-charged sediments are common in several areas of the lagoon. The gas accumulations in the Patos Lagoon are controlled by the spatial distribution of the sedimentary facies. Either in 'curtains' or in 'acoustic turbid zones', the main gas accumulations occur in areas with paleotopographic lows related to fluvial channels and valleys developed in the Rio Grande do Sul coastal plain during regressive/transgressive events of the Quaternary.

Palavras-chave : shallow gas; 3.5 kHz seismic; coastal plain; Rio Grande do Sul.

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