The Valdemar field, Danish central graben: Field compartmentalization and regional prospectivity of the Lower Cretaceous chalk play

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15 Citations (Scopus)

Abstract

Despite representing a widespread play in the Central North Sea, production from Lower Cretaceous chalks is currently confined to the Valdemar Field in the Danish Central Graben. The field comprises a heterogeneous reservoir succession, less than 100m thick, consisting of hemipelagic chalks, marly chalks, and marlstones of Late Hauterivian-Early Aptian age. Although the field has in-place reserves in the order of 115 × 10 6 m 3 (725 × 10 6 BBL), the recovery from this complex reservoir was initially estimated to be only approximately 1%, primarily due to low permeability. The argillaceous chalks of the Lower Cretaceous reservoir are highly faulted and fractured, overpressured and undercompacted, giving rise to a complex distribution of hydrocarbons. Due to the lithological heterogeneity of the succession, internal stratigraphic barriers are common and result in stratigraphic compartmentalization. In addition, clay smearing in fault zones has created structural barriers and the development of structural compartments, as reflected by spatial differences in oil saturations, oil types and maturity, formation pressure and porosity distribution. Analysis of the reservoir properties and structural development of the Valdemar Field has provided data that can be extrapolated to the remainder of the Danish Central Graben, indicating that the Lower Cretaceous is most prospective in the central and southern Danish Central Graben.

Original languageEnglish
Title of host publicationPetroleum geology: North-west Europe and global perspectives. Proceedings of the 6th Petroleum Geology Conference
EditorsA.G. Doré, B.A. Vining
PublisherGeological Society of London
Pages177-186
Number of pages10
Volume1
ISBN (Print)1-86239-164-5
DOIs
Publication statusPublished - 2005
Event6th Petroleum Geology Conference - Queen Elizabeth II Conference Centre, London, United Kingdom
Duration: 6 Oct 20039 Oct 2003

Publication series

NamePetroleum Geology Conference Series
PublisherGeological Society of London
Volume6

Conference

Conference6th Petroleum Geology Conference
Country/TerritoryUnited Kingdom
CityLondon
Period6/10/039/10/03

Keywords

  • Chalk
  • Compartmentalization
  • Lower Cretaceous
  • Reservoir zonation
  • Valdemar Field

Programme Area

  • Programme Area 3: Energy Resources

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