Data/hora: 01/06/2024 17:43:38

Provedor de dados: 	5	
País: 	France	
Título: 	Initiation of gas-hydrate pockmark in deep-water Nigeria: Geo-mechanical analysis and modelling	
Autores: 	Riboulot, Vincent; Sultan, Nabil; Imbert, P.; Ker, Stephan.	
Data: 	2016-01	
Ano: 	2016	
Palavras-chave: 	Pockmarks; Gas hydrates; VHR seismic data; Piezocone; Numerical modelling; Niger Delta.	
Resumo: 	A review of recent literature shows that two geomorphologically different types of pockmarks, contribute to gas seepage at the seafloor. Type-1 pockmarks are defined as seafloor craters associated to fluid seepage and are the most classical type referred to as “pockmarks” in the literature. In contrast, Type-2 pockmarks reveal a complex seafloor morphology that may result from the formation/decomposition of gas hydrates in underlying sedimentary layers.  Interpretation of very-high-resolution seismic data, sedimentological analyses and geotechnical measurements acquired from the Eastern Niger Submarine Delta reveal that Type-2 pockmarks are associated to the presence at depth of a conical body of massive gas hydrates. Based on acquired data, theoretical analysis and numerical modelling, it was possible to propose a novel geo-mechanical mechanism controlling the irregular seafloor deformations associated to Type-2 pockmark and to show that pockmark shapes and sizes are directly linked to the initial growth and distribution of sub-seafloor gas hydrates. The study illustrates the role of gas hydrates formation in the fracturation, deformation of the subsurface sediment and the formation of Type-2 pockmarks.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00301/41215/40643.pdf

DOI:10.1016/j.epsl.2015.11.047

http://archimer.ifremer.fr/doc/00301/41215/	
Editor: 	Elsevier Science Bv	
Formato: 	application/pdf	
Fonte: 	Earth And Planetary Science Letters (0012-821X) (Elsevier Science Bv), 2016-01 , Vol. 434 , P. 252-263	
Fonte: 	2015 Elsevier B.V. All rights reserved.

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