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Sleipner West Carbon Capture Storage plume movement

Energy transition

Sleipner West Carbon Capture and Storage 4D seismic monitoring

The objective of this carbon capture and storage (CCS) repeat seismic survey is to regularly monitor the distribution of Carbon Dioxide (CO₂), which had been injected into the 800 - 1100 m deep Utsira Formation sandstone since 1996.

At the time of writing, about 18 million tons of CO₂ has been injected into the formation, and through time-lapse seismic studies the migration of the CO₂ is being studied.

Project details

Sleipner is the world's first offshore CCS plant.

In operation since 1996, it stores approximately 1 million tonnes of CO₂ per year.

Client
Equinor

Location
Norwegian North Sea, Block 15/9, 160 miles west of Stavanger

RPS project date
2020

Services delivered

Offshore in-field feather predictions
Optimise line selection
SIMOPS and perform repeatability analysis to determine the quality of the survey

Why monitor Carbon Dioxide levels?

Previous repeat surveys (in total 9 monitor surveys since 1999) showed a large response from the injected CO₂. Therefore, it has been possible to map the distribution of undissolved CO₂ in detail.

The purpose of the current survey is to monitor the expansion of the plume, and to confirm that the CO₂ has stayed within the formation and not penetrated the overburden.

Reliable seismic data acquisition

The RPS solution involves making optimal line planning decisions to ensure that the survey data is acquired efficiently, minimising the number of lines required for completion.

Achieving the 4D repeatability specifications ensures that the data acquired is of sufficient quality to meet the geophysical objectives to image the CO₂ plume.

The acquisition of the 2020 Sleipner CO₂ 4D survey yielded good coverage and repeatability results, ensuring the survey met its geophysical objectives. SIMOPS played a part during the survey, which was coordinated and managed by RPS with no lost time or rejected data.

The survey only required 6 of the possible 10 E/W lines and was completed in 5 days, ahead of schedule and under budget.