IEA Greenhouse Gas R&D Programme

Statoil, in conjunction with the Permedia Research Group, have prepared a Sleipner-based benchmark model using the uppermost CO2 unit: layer 9. The aim of the benchmark model is to improve modelling tools and methods and our understanding of CO2 flow dynamics.

The CO2 injection at Sleipner started in 1996 and as such is the world’s longest running industrial scale CO2 storage project, with an extensive monitoring dataset. The monitoring programme consists of four hjosir quality repeat seismic surveys, three gravimetric surveys and one electromagnetic survey.

Several benchmark models with regards to the CO2 storage industry have already been published in the literature, but these may be hypothetical in nature and unconstrained by monitoring data, omitting detailed geological and reservoir engineering aspects. For a benchmark model, the monitoring data should be of sufficient detail and duration to calibrate key uncertainties; the Sleipner benchmark model aims to do this by defining a well-constrained real case.

At Sleipner, CO2 is injected into the Utsira Formation; a Miocene shallow marine sandstone formation that overlies the mainly Jurassic oil and gas-bearing formations of the North Sea. Overlying the sandstones is the Nordland Group shale sequence, which provides an effective caprock at the CO2 storage site. The storage reservoir consists of two units; the main lower ‘Utsira Sand’ and an upper ‘Sand Wedge’, which is constrained by the overlying caprock. It is this sand wedge interval that is designated ‘layer 9’ and confines the benchmark model.

The downloadable folder contains the dataset, an explanation of the data included and the SPE paper ‘Reservoir modelling of CO2 plume behaviour calibrated against monitoring data from Sleipner, Norway ‘, which details some initial sensitivity modelling carried out using the Sleipner benchmark model.

To access the model, please register here, once the registration is approved you will need receive an email with a link to download the folder.

Once you have received the model, if you have any queries or comments, please post on the forum thread which can be found under Members in the main menu.