Phase 2: Injectivity tests (2011 - 2013)

The purpose of the Phase 2 pilot project of 2011-2013 was to further verify the injectivity and capacity of the reservoir and predict the overall geometry and size of the storage unit. Further, testing the cap rock sealing capacity was on the agenda. A series of injection tests used water as a medium with tracers added. The injection tests were performed by different methods; Leak-Off-Tests (LOT) with high flow over a few minutes in targeting cap rock shales, and Step-Rate-Tests (SRT) with gradually increasing (in steps) moderate flow over days (2-5 days) towards sandstones of the reservoir.

Tests towards cap rock shales gave high yield strengths and confirmed that the cap rock is sealing. This conforms to the observations of the significant under-pressure, which document that there are both vertical and layer-parallel flow barriers in and around the reservoir.
The tests and analyses performed during Phase 2 further determined the reservoir pressure, and effective porosity and permeability of the various segments of the stacked reservoir. Subsequent modelling addressed the overall geometry and scenarios for storage volumes.

In this phase, the project also performed laboratory level CO2 injection, using the core samples from the drill holes. CT-scan results suggest that there is interconnected but slow CO2 flow between larger fractures, micro-fractures and the pore-space in the sandstones.

The phase 2 activity also gathered some dataset as part of early-phase baseline studies. These datasets include marine pockmarks and permafrost characteristics.

In 2014-15 the project summarized it findings through a number of contributions - final report of Phase 2 and scientific journals including Norwegian Journal of Geology. These articles explore vital parts of the research results, thereby contributing to the total knowledge base. New knowledge is uncovered that will both further the scientific knowledge base and enable CCS to become an effective tool in combatting global warming.

From the start of the CO2 project in 2006 the vision of a CO2 neutral society has inspired many visitors and scientists. A reservoir has been found, and the overlying cap rocks are sealing. On the political agenda, the vision has been closely linked to the future of the power station long awaiting renovation. With a decision to not modernise the power station, the vision for Longyearbyen and CCS moves farther away from its goal than it was 8 years ago. What remains are the scientific results that will live forever.
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Project manager:
Principal Investigator:

Kim Senger

HSE leader:

Fred Skancke Hansen