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Dual hydraulic behaviour of the Chalk in the Netherlands North Sea

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Author: Verweij, H.
Type:article
Date:2006
Institution: TNO Bouw en Ondergrond
Source:Journal of Geochemical Exploration, 1-3 SPEC. ISS., 89, 405-408
Identifier: 239213
Keywords: Geosciences · Chalk · Netherlands North Sea · Overpressure · Permeability · Aquifers · Data structures · Hydraulics · Sedimentation · Settling tanks · Stratigraphy · Chalk · Dolomitization · Overpressure · Oceanography · chalk · hydraulics · modeling · overpressure · permeability · sediment thickness · Atlantic Ocean · Benelux · Central Graben · Eurasia · Europe · Netherlands · North Sea · Western Europe

Abstract

Information on the sedimentary development, seismic stratigraphy and burial compaction of the Chalk Group in the Netherlands North Sea was combined with pressure data and basin modelling to investigate the hydraulic behaviour of the Chalk Group in the Central Graben and Schill Grund High. The preliminary results of this integrated study indicate that the undercompacted Chalk of reduced thickness (0-300 m) in the inverted Central Graben behaves as an aquifer. In contrast it was found that the normally compacted, mostly pelagic, Chalk of thickness 600-1200 m on the adjacent Schill Grund High acts as an aquitard with permeabilities comparable to those of shales. © 2006 Elsevier B.V. All rights reserved.