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Snohvit C02 Tubaen Fm. storage capacity and inj«ction strategy study
Valid from
Rev. no. 1.0
Figurę 76: Simulation results in January 2010 for case 1. Left; CO2 saturation. Right: pressure build-up. Top: Tubaen 1, middle: Tubaen 2 and bottom: Tubaen 3.
The symmetric shape of the plume in Tubaen 1 is comparable to the interpretations of the 4D data regarding the size of the anomaly. Plume shape in Tubaen 2 is slightly larger than what seismic data show and should be corrected. The size of the area modelled to have pressure variation in Tubaen 2 is clearly bigger than what is expected from seismic interpretations. The reason behind this is that no constraint has been defined yet in Tubaen 2 to control pressure in Tubaen 2. The same is true for Tubaen 3. The best approach here is to constrain BASRA in a way that the relative ratios of permeability values in all Tubaen layers reflected from well observations is respected. That would probably invert the relation between inflow into Tubaen 2 and Tubaen 3, as the highest permeabilities are measured in Tubaen 3 in 7121 /4-2-F H.
In our analysis of the estimated bottom-hole pressure we have so far focused only on the shut-in periods. Figurę 77 shows a comparison between the match results and measured pressure in both flow and shut-in periods. As
Classification: Intemal Status: Draft Expiry datę: 2012-12-31 Page 90 of 132
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