Upper Jurassic reservoir sandstones in the Danish Central Graben: New insights on distribution and depositional environments

P.N. Johannessen, K. Dybkjær, C. Andersen, L. Kristensen, J. Hovikoski, H. Vosgerau

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

24 Citations (Scopus)

Abstract

Recently available well data from the northern part of the Danish Central Graben have been analysed to further understand the basin development, biostratigraphy, depositional models and palaeogeography of Upper Jurassic reservoir sandstones, which are the primary exploration targets in this basin. Notably, the discovery of the Hejre accumulation in 2001, where oil has been encountered in Upper Jurassic good reservoir quality sandstones at a depth of more than 5000 m, triggered renewed interest in the Upper Jurassic High Temperature- High Pressure sandstone play in the area. Overall the Danish Central Graben was transgressed from east to west during the Late Jurassic. During the Late Kimmeridgian, marginal and shallow marine sandstones assigned to the Heno Formation were deposited at the margin of the Feda Graben, and on the Gertrud and Heno Plateaus and constitute the reservoirs in the Freja and Hejre discoveries. The sandstones are analogues to the UKFulmar and NorwegianUla Formations encountered in several hydrocarbon fields. During the Early Volgian, the transgression continued westwards across the Outer Rough Basin along the margin of the Mid North Sea High, where shoreface sandstones with excellent porosities and permeabilities were deposited close to similar sandstones of the Fulmar Formation in the British Fergus, Fife and Angus fields. During this overall westward transgression, the eastern and central parts of the Danish Central Graben continued to subside and offshore mudstones accumulated, locally intercalated with gravity-flow sandstones. In the easternmost Danish Central Graben, in the Tail End Graben, Upper Kimmeridgian gravity-flow sandstones of the Svane-1 well have proved the presence of gas at c. 6 km depth. Hydrocarbon-bearing Upper Jurassic sandstone reservoirs at significant depths (deeper than 5 km) may form the future exploration targets in the northern part of the Danish Central Graben.

Original languageEnglish
Title of host publicationPetroleum geology: from mature basins to new frontiers - Proceedings of the 7th petroleum geology conference
EditorsB.A. Vining, S.C. Pickering
PublisherGeological Society of London
Pages127-143
Number of pages17
Volume1
ISBN (Electronic)978-1-86239-298-4
DOIs
Publication statusPublished - 2010
Event7th Petroleum Geology Conference - Queen Elizabeth II Conference Centre, London, United Kingdom
Duration: 30 Mar 20092 Apr 2009
Conference number: 7

Publication series

SeriesPetroleum Geology Conference Series
Volume7

Conference

Conference7th Petroleum Geology Conference
Country/TerritoryUnited Kingdom
CityLondon
Period30/03/092/04/09

Keywords

  • Basin development
  • Biostratigraphy
  • Danish central Graben
  • North Sea
  • PalaeogeographyUpper jurassic
  • Reservoir sandstones
  • Sedimentology

Programme Area

  • Programme Area 3: Energy Resources

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