Seistec seismic profiles: A tool to differentiate gas signatures

Type Article
Date 2005-06
Language English
Author(s) Baltzer Agnès1, Tessier Bernadette1, Nouze Herve2, Bates R3, Moore C4, Menier D5
Affiliation(s) 1 : Univ Caen, Lab Morphodynam Continentale & Cotiere, UMR 6143, F-14000 Caen, France.
2 : IFREMER, DROGM,Brest, France.
3 : Univ St Andrews, Sch Geog & Geosci, St Andrews, Fife, Scotland.
4 : Heriot Watt Univ, Dept Biol Sci, Edinburgh EH14 4AS, Midlothian, Scotland.
5 : Univ Bretagne Sud, Vannes, France.
Source Marine Geophysical Researches (0025-3235) (Kluwer), 2005-06 , Vol. 26 , N. 2-4 , P. 235-245
DOI 10.1007/s11001-005-3721-x
WOS© Times Cited 26
Keyword(s) Signal amplitude, Signal polarisation, Gas, Acoustic facies, Seistec profiles
Abstract The presence of gas is a common feature in many seismic sections. However, the origin of the gas is often difficult to determine. Recently acquired very high resolution seismic profiles using an IKB Seistec boomer provide useful insight to the understanding of the gas origins in a range of environmental settings including sea lochs and coastal lagoons. The gas features are described both from a qualitative point of view through their acoustic facies, and quantitatively through the associated seismic signal (polarisation, amplitude). Acoustic facies include acoustic turbidity, gas "curtains" and "blankets" as well as "white fringes" and "black shadows". All the features encountered have been related to specific gas nature generated by different sources (organic matter degradation in paleo-valley infillings, waste material effluent).
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