80th EAGE Conference & Exhibition 2018

Opportunities presented by the energy transition

Date
11 - 14 June
Location
Copenhagen, Denmark
Registration
Closed
Call for papers
Closed

Core Display - Reservoirs of the Late Jurassic Petroleum System of the Danish Central Graben

WS11

Monday 11 June 2018

Title: Core Display - Reservoirs of the Late Jurassic Play of the Danish Central Graben
Room: P
Convenors: P. N. Johannessen (GEUS)
H. Midtgaard (INEOS)
G. Dam (GEUS)


Workshop Description

The aim of this core display is to present an overview of the stratigraphy, sand distribution, depositional environments and reservoir characteristics of the potential Late Jurassic reservoir sandstones in the northern part of the Danish Central Graben.

Cores from 9 wells will be displayed. The first showcase is on the Late Kimmeridgian, shallow marine sandstones, and the second one will cover Late Kimmeridgian - Ryazanian deep marine sandstones. This is an opportunity for the participants to examine the main reservoir units’ equivalent to the reservoirs of the UK Fulmar Formation, the Norwegian Ula Formation and Farsund Formation discoveries.

 

Workshop Programme

09:00 Welcome 
09:15   Presentation of the Jurassic in the Danish Central Graben (North Sea): Stratigraphy, depositional environments, sand distribution, and palaeogeographic maps. 
09:50 Demonstration of Poster
10:00 Coffee break 
10:15 Evaluation of cores - First Showcase: Late Kimmeridgian, shallow marine sandstones. 
11:00 Evaluation of cores. Second showcase: Late Kimmeridgian -Ryazanian deep marine sandstones.
11:45 Discussion and Conclusions 
12:15 End of workshop  

Please note that this programme is subject to change.

First showcase: Late Kimmeridgian, shallow marine sandstones

During the Late Kimmeridgian – Early Volgian, marginal and shallow marine sands 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 Gert, Mjølner and Hejre discoveries. Cores from the Gert-1, Rita-1, Ophelia-1, Saxo-1, Ravn-1 and the Hejre development wells, will exemplify the shallow marine reservoir facies.  Some of these reservoirs have very high porosities and permeabilities, despite burial depths of more than 5 km.

Second showcase: Late Kimmeridgian - Ryazanian deep marine sandstones.

During Late Kimmeridgian to Ryazanian deep-water muds accumulated in the central and eastern part of the Danish Central Graben.  In the eastern-most part of the Danish Central Graben, thick sequences of turbidite sands were deposited as proven in Gita-1X and in the Svane-1 discovery wells. Near the basin margin, several thin turbidite sandstones and debris flow deposits have been penetrated and in Amalie-1, Lulu-2 and Tabita-1 wells where some of the sands have been cored. 

For the discussion of the Jurassic petroleum systems, the GEUS Petsys database will be demonstrated. This is a Web-GIS database platform covering the Jurassic Petroleum System in the Danish part of the North Sea. The database includes: bio-and chronostratigraphy, lithostratigraphy, sequence stratigraphy, seismic stratigraphy, palaeogeographic maps, petrophysical interpretations, and distribution and characterization of potential reservoirs.