Data/hora: 01/06/2024 17:22:51

Provedor de dados: | 5
País: | France
Título: | Types of fluid-related features controlled by sedimentary cycles and fault network in deepwater Nigeria
Autores: | Marsset, Tania; Ruffine, Livio; Ker, Stephan; Cauquil, E.; Gay, Aurelien.
Data: | 2018-01
Ano: | 2018
Palavras-chave: | Niger delta; Fluid flow; Pockmark; Gas hydrates; Methane-derived carbonate; Fault network; Sedimentary cycles.
Resumo: | The seismic characteristics of focused fluid-related features such as pockmarks and carbonate build-ups on the Nigerian continental slope have been investigated using complementary seismic data sets (reprocessed 3D exploration data and 2D Very High Resolution hull-mounted and near-bottom seismic data) coupled with the results of previous studies (sedimentological, geotechnical and geochemical analyses). The results show different types of fluid-related features within the hemipelagic phase of long duration (∼1 Myr) Turbidite/Hemipelagic cycles. They are the product of the disturbance of the hosting sediments following two main distinct processes: (1) no or low sediment deposition caused by fluid escape associated with seafloor settlement (benthic fauna, carbonate precipitation, gas hydrate formation) and (2) post-depositional erosion, caused either by fluid release (dewatering from underlying features such as channels and upward migration from a deep source) or by collapse (destabilisation of gas hydrates). The temporal evolution reveals a decrease in fluid flow during the hemipelagic deposition as witnessed by the decrease in methanogenic activity and by gas hydrate destabilisation. The spatial distribution of fluid-related features seems to be controlled by the type of fault (small fault or structural lineament).
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00405/51650/52199.pdf

DOI:10.1016/j.marpetgeo.2017.10.004

https://archimer.ifremer.fr/doc/00405/51650/

Editor: | Elsevier Sci Ltd
Formato: | application/pdf
Fonte: | Marine And Petroleum Geology (0264-8172) (Elsevier Sci Ltd), 2018-01 , Vol. 89 , N. Part.2 , P. 330-349

Fonte:

2017 Elsevier Ltd. All rights reserved

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