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New Insights in Shallow Gas Generation from Very High Resolution Seismic and Bathymetric Surveys in the Marennes-Oléron Bay, France
Authors:Xavier Bertin  Eric Chaumillon
Institution:(1) Centre Littoral de Geophysique, Universite de la Rochelle, Avenue Michel Crepeau, 17042 La Rochelle-Cedex 01, France
Abstract:Very high resolution seismic profiles, ground-truthed by vibrocores, have revealed the occurrence of kilometre-scale acoustic turbidity in the Marennes-Oléron Bay, France. Such acoustic turbidity is commonly interpreted as gas-charged sediments. Comparison between accurate historical bathymetric data and the present day bathymetry has shown high sediment accretion zones in the study area (locally up to 8 m since 1824). The superimposition of seismic and bathymetric datasets displays a striking correlation between the high sedimentation rate area and the boundaries of the acoustic turbidity, i.e. gas-charged sediments. The key role of sedimentation rates in shallow gas generation in the study area is pointed out. It is also concluded that shallow gas is probably generated at short (decadal to secular) time scales.
Keywords:shallow gas  VHR seismic  sedimentation rates  macro-tidal bay
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