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

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Abstrakt

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.

OriginalsprogEngelsk
TitelPetroleum geology: North-west Europe and global perspectives. Proceedings of the 6th Petroleum Geology Conference
RedaktørerA.G. Doré, B.A. Vining
ForlagGeological Society of London
Sider177-186
Antal sider10
Vol/bind1
ISBN (Trykt)1-86239-164-5
DOI
StatusUdgivet - 2005
Begivenhed6th Petroleum Geology Conference - Queen Elizabeth II Conference Centre, London, Storbritannien
Varighed: 6 okt. 20039 okt. 2003

Publikationsserier

NavnPetroleum Geology Conference Series
ForlagGeological Society of London
Vol/bind6

Konference

Konference6th Petroleum Geology Conference
Land/OmrådeStorbritannien
ByLondon
Periode6/10/039/10/03

Programområde

  • Programområde 3: Energiressourcer

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