Abstract
The application of the empirical Eaton method to calibrated sonic well information and 3D seismic interval velocity data in the southeastern part of the Central North Sea Graben, using the Japsen (Glob. Planet. Change 24 (2000) 189) normal velocity-depth trend, resulted in the identification of an undercompacted and overpressured zone within the shaly Lower North Sea Group. Calculated overpressures near the bottom part of the group increase from east to west, from 3.5 to 5.5 MPa, that is in the direction of increasing sedimentary loading rates in Pliocene-Quaternary times. This ability of the application of sonic and 3D seismic velocity in empirical methods to assess the spatial distribution of overpressures in such shaly units is of importance because measured pressure data are usually not available for shaly sections.
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