Top Chalk surface in the Danish subsurface

This dataset represents the structure and topography of the Top Chalk surface, i.e. the top of the Chalk Group (including Upper Cretaceous to Danian), in the Danish subsurface. The map illustrates regional variations in the depth and structural configuration of the chalk surface from the central North Sea to the eastern Danish areas. It is based on an integrated geological and geophysical interpretation of seismic profiles, well data and earlier mapping. The map provides an essential basis for geological, geophysical and subsurface reservoir analyses.

Simple

Date ( Publication )
2007-11-20
Identifier
dk.geus / top_kalk
Presentation form
Digital map
Purpose
The purpose of the dataset is to provide an overview map of the chalk top surface as a structural reference for understanding the subsurface geology, including reservoir conditions, structural geology and depth units in the Danish sector. The dataset supports scientific analyses, resource modelling and geophysical interpretation.
Status
Completed
Point of contact
  The Geological Survey of Denmark and Greenland (GEUS) - GIS-support ( )
Maintenance and update frequency
As needed
Point of contact
  The Geological Survey of Denmark and Greenland (GEUS) - GIS-support
Keywords ( Theme )
  • Dataset
  • Geology
  • Top Chalk
  • Subsurface
  • Denmark
  • Seismic
Forskningsemner Forskningsemner ( Theme )
Geografisk Geografisk ( Place )
Access constraints
Other restrictions
Use constraints
Other restrictions
Other constraints
CC BY-SA 4.0
Other constraints
Use of the dataset requires acknowledgement of the Geological Survey of Denmark and Greenland (GEUS) as the data source.
Spatial representation type
Grid
Denominator
400000
Metadata language
Da
Character set
UTF8
Topic category
  • Geoscientific information
Begin date
1970-01-01
End date
2007-11-20
N
S
E
W
thumbnail


Supplemental Information
The dataset covers the entire Danish territory – onshore and offshore in the North Sea – and shows significant variations in the chalk top surface. Chalk is an important reservoir rock for oil and gas in the North Sea and serves as an aquifer onshore. The top surface mapping is relevant for the energy sector, hydrogeology and geological research.
Reference system identifier
ETRS 89 / UTM 32N (EPSG:25832)
Distribution format
  • WMS ( )

  • REST ( )

Distributor
  The Geological Survey of Denmark and Greenland (GEUS) - GIS-support
OnLine resource
Interactive webmap ( WWW:LINK-1.0-http--link )

Interactive map displaying the dataset.

OnLine resource
Mapping of the chalk group in Denmark – GEUS Bulletin ( WWW:LINK-1.0-http--link )

Scientific article published in GEUS Bulletin describing the geological and geophysical methods used to map the top, base and thickness of the chalk group in Denmark.

OnLine resource
Mapping of the chalk in Denmark – GEUS Report 2003/106 ( DOI )

Technical report from GEUS documenting the data basis, seismic interpretation and methodology used for mapping the top chalk surface in the Danish subsurface.

OnLine resource
DetDanskeOmraade ( ESRI:REST )

ArcGIS REST Service

OnLine resource
TopKalk_DKomr_depth ( OGC:WMS-1.3.0-http-get-capabilities )

ArcGIS WMS Service

Hierarchy level
Dataset
Statement
The dataset was developed as part of GEUS’s geological mapping initiatives and was described in GEUS Bulletin No. 13 (2007), which published three maps of chalk in Denmark: top chalk surface, base chalk surface, and an isopach map of the chalk group. The maps were produced by integrating extensive seismic data, well data from more than 500 deep oil and gas wells, and mapped information from water boreholes and previous geological interpretations. The interpretations are based on publicly available seismic profiles and geological data compiled up to the early 2000s.
File identifier
74fa74d5-7383-49fa-a8d2-93b410bc4985 XML
Metadata language
Danskda
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2026-03-20T11:04:08.133393Z
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
  The Geological Survey of Denmark and Greenland (GEUS) - GIS-support ( )
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

Dataset Denmark Geology Seismic Subsurface Top Chalk
Forskningsemner
Geoscience and history policy

Provided by

Associated resources

Not available