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Artículo

The control of palaeo-topography in the preservation of shallow gas accumulation: Examples from Brazil, Argentina and South Africa

Weschenfelder, Jair; Klein, Antonio H. F.; Green, Andrew N.; Aliotta, SalvadorIcon ; de Mahiques, Michel M.; Ayres Neto, Arthur; Terra, Laurício C.; Correa, Iran C. S.; Calliari, Lauro J.; Montoya, Isabel; Ginsberg, Silvia SusanaIcon ; Griep, Gilberto
Fecha de publicación: 02/2016
Editorial: Elsevier
Revista: Estuarine, Coastal and Shelf Science
ISSN: 0272-7714
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Oceanografía, Hidrología, Recursos Hídricos

Resumen

Acoustic anomalies in seismic records have revealed that gas-charged sediments are very common features in the coastal environments around the world. The ubiquitous gassy sediments challenge the effective acoustic mapping of shallow stratigraphy by seismic means, as well as having an important influence on environmental issues related to the coastal zone occupation and management. This paper documents examples of gassy sediments from coastal lagoons, estuaries, rivers, bays and the inner shelf and nearshore environments of Brazil, Argentina and South Africa. Seismic echograms from selected areas show several gas-related anomalies, which present distinctive morphologies for sediment-trapped gas, leaking or free gas discharge into the water column. In several places the gas-charged sediments occur in areas of palaeo-topographic lows related to fluvial channels and valleys that developed in the coastal zone due to sea level oscillations during the Quaternary period. This forcing by palaeotopographic features results in the occurrence of shallow gas being controlled in most coastal sites by the previous environmental scenario, the stratigraphic arrangement of the transgressive infilling elements, and the local hydrodynamic conditions.
Palabras clave: South America , South Africa , Acoustic Survey , Shallow Gas
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/26320
DOI: http://dx.doi.org/10.1016/j.ecss.2016.02.005
Colecciones
Articulos(IADO)
Articulos de INST.ARG.DE OCEANOGRAFIA (I)
Citación
Weschenfelder, Jair; Klein, Antonio H. F.; Green, Andrew N.; Aliotta, Salvador; de Mahiques, Michel M.; et al.; The control of palaeo-topography in the preservation of shallow gas accumulation: Examples from Brazil, Argentina and South Africa; Elsevier; Estuarine, Coastal and Shelf Science; 172; 2-2016; 93-107
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