Play Analysis of the Middle Jurassic of the Danish North Sea, an Integrated Basin Modeling Study
D. Schwarzer, T. Fronval, L.F. Clausen, and R. Ensley
Maersk Oil and Gas, Copenhagen, Denmark
A comprehensive evaluation of the Middle Jurassic prospectivity in the Danish North Sea formed the technical basis for an assessment of the Middle Jurassic play and the controlling factors for hydrocarbon and reservoir occurrence.
The first phase of the play analysis included the generation of a new stratigraphic framework based on integration of seismic and well data. This introduced a regional unconformity at the base of the Callovian dividing the reservoir section into a primary Callovian section and a secondary Bathonian section.A post-mortem analysis of 22 wells revealed that 7 wells were either tested or documented to have movable hydrocarbons, 3 had major gas or oil shows. The analysis involving an evaluation of play parameters demonstrated that source and migration are the most critical factors for the play.The Middle Jurassic play comprises reservoirs at depths of 7,000 ft to 15,000 ft, interpreted to be formed by alluvial braided and fluvial sand prone channel systems on a coastal floodplain. The distribution and quality of reservoir sandstones were evaluated using a combination of seismic attribute data, electric logs, core descriptions and porosity-permeability data. The final facies model suggests that the sandstones formed in tributary river systems flanking the incipient Central Graben and in a north-south trending axial system. Gross thickness, Net/Gross, net porosity of pay and permeability are within the ranges of 25-125 ft, 0.11-0.76, 10-30% and 1-1000 mD, respectively. Seismic interpretation demonstrated that the play involves a variety of![Previous Hit](/images/arrow_left.gif)
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AAPG Search and Discover Article #90066©2007 AAPG Hedberg Conference, The Hague, The Netherlands