[2][3] The field produces natural gas and light oil condensates from sandstone structures about 2,500 metres (8,200 ft) below sea level.

[7] The Sleipner West field has up to 9% CO2 concentration; Norway only allows 2.5% CO2 before imposing production export quality penalties, which may have been NOK 1 million/day ( ~$120,000US/ day).

[7] Using time-lapse gravity and seismic methods, the pioneering Sleipner carbon capture project confirmed the technological viability of injecting and measuring CO2 in an offshore reservoir, as well as the effectiveness of mitigating emissions through stable storage.

[16] To avoid possible leakages that can result in health hazards and environmental destruction,[16] above the Utsira Formation injection site lies 30 seafloor gravity stations for monitoring under the title,[17] Saline Aquifer CO2 Storage.

[17] Explicitly regulated under Norway's petroleum law in December 2014 and in line with the EU's 2009/31/EC directive, monitoring objectives focus on assessing gas movement, shell stability, and the effectiveness of remedy scenarios in case of leakage.

[16] However, when the injections are eventually decommissioned, simulations show accumulation proximate to the cap seal in clay layers saturated with sand, which will result in solubility trapping.

[16] The composition reaction of the mixture of clay, sand, and carbon is the determining factor of long-term stability in the Sleipner CCS project.

[16] As of 2007, measurements from the gravity stations revealed that the injection of CO2 into the Utsira Formation has not resulted in any noticeable seismic activity and that there have been no carbon dioxide leakages in the past 10 years.

[16] In the north and south lie deep sand systems, while in the middle region slimmer deposits cover the seafloor.