Positive results from initial Havstjerne CO2 storage well and test
June 2, 2025
An exploratory well for the Havstjerne CO2 storage project offshore Norway in the North Sea has confirmed a reservoir suitable for injection and storage of carbon dioxide.
The well was drilled using the Deepsea Nordkapp drilling rig.
An exploratory well for the Havstjerne CO2 storage project offshore Norway in the North Sea has confirmed a reservoir suitable for injection and storage of carbon dioxide.
The proposed project is within a CO2 storage license in the southern Norwegian Sea, 100 km southeast of Egersund and close to ports in northern Europe.
The objective of well 9/6-1 was to investigate whether Middle Jurassic and Middle and Upper Triassic reservoir rocks in the Havstjerne project are suitable as a storage site for CO2.
According to the Norwegian Offshore Directorate (NOD), the purpose of well 9/6-1, drilled by the semisub Deepsea Nordkapp in 90 m of water, was to see whether Mid-Jurassic and Middle and Upper Triassic reservoir rocks would be suitable for storing CO2.
Among the findings, the well encountered 115 m of homogeneous shale in the Tau Formation (caprock); 58 m of sealing shale and dense siltstone in the Egersund Formation (caprock); 97 m of sandstone of good reservoir quality in the Sandnes Formation; and 52 m of sandstone with moderate-quality reservoir in the Bryne Formation.
After reaching a vertical depth of 3,366 m subsurface, the well was terminated and permanently plugged and abandoned in the Skagerrak Formation in the Upper Triassic.
The NOD said the formation pressure data indicated that the rocks in the Sandnes and Bryne formations are located in a regional hydrostatic pressure gradient for this area.
An injection test during the campaign had positive results, according to early analysis.
