New Insights in Shallow Gas Generation from Very High Resolution Seismic and Bathymetric Surveys in the Marennes-Oléron Bay, France |
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Authors: | Xavier Bertin Eric Chaumillon |
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Institution: | (1) Centre Littoral de Geophysique, Universite de la Rochelle, Avenue Michel Crepeau, 17042 La Rochelle-Cedex 01, France |
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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. |
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Keywords: | shallow gas VHR seismic sedimentation rates macro-tidal bay |
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