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Provedor de dados:  ArchiMer
País:  France
Título:  Detection of free gas and gas hydrate based on 3D seismic data and cone penetration testing: An example from the Nigerian Continental Slope
Autores:  Sultan, Nabil
Voisset, Michel
Marsset, Tania
Vernant, Antoine-mathieu
Cauquil, E
Colliat, J
Curinier, V
Data:  2007-06
Ano:  2007
Palavras-chave:  Piezocone
Niger delta
Gas hydrate
Free gas
Effective medium theory
Resumo:  We present a new method to characterize free gas, gas hydrates and carbonate concretions occurrence which are considered as high-risk factors for sub-sea developments in the Niger delta. This method is based on the combination of 3D seismic data to the geotechnical site characterizations using piezocone CPTU tests (Cone Penetration Test with additional measurement of the pore water pressure). A special processing of the 3D seismic data has enabled the determination of the interval compressional velocity. Using the effective-medium theory, velocity anomalies (negative and positive) within the first 15 m were translated in gas hydrate and free gas distribution. The calibration of the P wave velocity anomalies was done thanks to in-situ geotechnical testing carried out during two oceanographic surveys (2003 and 2004). Comparison between in-situ testing, recovered cores and the prediction of the gas and the gas hydrate distribution based on the compressional wave velocity have shown that 3D seismic data is a valuable tool to identify heterogeneous areas but the use of the piezoeone was essential to discriminate between gas hydrate occurrences and carbonate concretions' presence. Furthermore, in-situ compressional wave velocity (V-p) measurements have clearly demonstrated what it was suspected from the 3D seismic data, the co-existence in the study area between gas hydrate and free gas. (c) 2007 Elsevier B.V. All rights reserved.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier
Formato:  application/pdf
Fonte:  Marine Geology (0025-3227) (Elsevier), 2007-06 , Vol. 240 , N. 1-4 , P. 235-255
Direitos:  2007 Elsevier B.V. All rights reserved

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