VØMAG (2011-2013)


Effects of sill emplacement on petroleum systems in the Vøring Margin

The Vøring Margin is an old volcanic margin with numerous volcanic extrusions and intrusions. Most of the intrusions are dykes and sills, which both affect the thermal history of the associated areas and the hydrocarbon maturation. Some of the sills form clusters and may have had very great effects of the thermal evolution of the surrounding rocks. Furthermore, sills and dykes may contribute to the formation of reservoirs, not only be generating dense rocks that may act as seals for the migration of hydrocarbons, but they may also function as reservoirs themselves. This latter applies particularly to thick and extensive sills that may, due to columnar jointing, form fracture-porosity reservoirs with high porosity. Sill emplacement in layered rocks may also induce stresses in stiff layers far away from the sill itself, stresses that may result in fracture development and reservoir formation.

The objective of the project was to analyze the thermal effect of intrusions on hydrocarbon maturity and diagenesis, as well as to analyze how sills may act as potential seals, or as fractured petroleum reservoirs.

The project was running 2011-2013 with Sintef Petroleum and Royal Holloway University of London as partners. Three oil companies funded the project.

The results of this project are available to the participating companies.

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