Estimating regional pore pressure distribution using 3D seismic velocities in the Dutch Central North Sea Graben
article
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 velocitydepth 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. © 2003 Elsevier Science B.V. All rights reserved.
Topics
North SeaPressureSeismicVelocityCalibrationPressure distributionSeismic prospectingShaleThree dimensionalVelocity measurementEaton methodsLoading ratesOverpressured zonesSeismic velocitiesSpatial distributionPore pressureempirical analysisoverpressurePliocene-Pleistocene boundarypore pressurepressure gradientseismic dataseismic velocityshalespatial distributionwell loggingAtlantic OceanCentral GrabenNorth Sea
TNO Identifier
237057
ISSN
03756742
Source
Journal of Geochemical Exploration, 78-79, pp. 203-207.
Pages
203-207
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