The Valdemar Field, Danish Central Graben: field compartmentalization and regional prospectivity of the Lower Cretaceous chalk play
Published:January 01, 2005
F. Jakobsen, J. R. Ineson, L. Kristensen, H. P. Nytoft, L. Stemmerik, 2005. "The Valdemar Field, Danish Central Graben: field compartmentalization and regional prospectivity of the Lower Cretaceous chalk play", Petroleum Geology: North-West Europe and Global Perspectives—Proceedings of the 6th Petroleum Geology Conference, A. G. Doré, B. A. Vining
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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 100 m 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 × 106 m3 (725 × 106 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.
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Petroleum Geology: North-West Europe and Global Perspectives—Proceedings of the 6th Petroleum Geology Conference
Petroleum Geology: North-West Europe and Global Perspectives–Proceedings of the 6th Petroleum Geology Conference represents key papers from the latest in a series of conferences that have become a focus for the most important issues in North-West European petroleum geology. As well as detailing the advances made in North-West Europe since the 5th Conference, this two-volume set also documents many generic and addresses the European experience in a global context.
The content focuses on the following items:
The global resource context
Exploration histories and future potential
Better recovery through better reservoir characterization
Atlantic margins: new insights, regional synthesis and large-scale tectonics
Deep-water plays and reservoirs
Understanding petroleum systems
Unlocking the future with innovative geophysics
The volumes are accompanied by an extensive selection of core photographs and seismic animations illustrating the many exploration models described. These books provide a significant reference to all geoscientists engaged in exploration and production in North-West Europe, to academic engaged in studying the area and to petroleum geologists interested in generic exploration models.