Influence of Salt Diapirism and Glacial Effects on the Development of the Mittelplate Oil Field,
Grassmann, Stefan1, Bernhard Cramer1,
Georg Delisle1, Juergen
Messner2, Jutta Winsemann3 (1)
Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany (2) Geological Survey of Lower Saxony, Hannover, Germany (3) University Hannover,
The Mittelplate oil field is the most productive hydrocarbon
accumulation in System
the field is located in northern
system
is linked to the Jurassic West Holstein
Trough which contains the Lower Jurassic Posidonia
shale as prominent source rock. The Mittelplate oil
field forms a
structural
trap
at the western flank of the Buesum
salt dome with the Middle Jurassic reservoir sandstones pinching out at the
domes flank. Hydrocarbon migration from the Lower Jurassic Posidonia
shale into the reservoirs occurred up-dip from the deeper subsiding rim
syncline into the
structural
trap
at the salt dome flank. Besides the
dominating influence of halokinesis on the entire
West Holstein Trough petroleum
system
, advances of the Scandinavian ice sheet
during the Pleistocene intensively influenced the physicochemical habitat
within the sediments of the study area. In order to reconstruct petroleum
generation and migration and to quantify the influences of halokinesis
and glacial processes on the
structural
and thermal evolution, basin modelling (PetroMod, IES Aachen) was performed along a 2D section. Sediment-surface
temperatures for Quaternary times as well as permafrost and loading of ice
sheets were implemented into the model. The simulated continental glaciations
show considerable effects on the pressure and temperature regime in the deeper
subsurface. Despite the fact that glacial processes are not an integral part of
Petroleum Systems Modelling we suggest that glacial
processes need to be considered in formerly glaciated areas.