article for your general information..., page-35

My understanding is that ENI ran wireline pressure tests and formation sampling on Zones 1,2 and 3, and would expect that these would also have been used on the recent logging of Zones 4 and 5.

If they were successful in getting a sample to surface then they should already have a pretty good idea of CO2 concentration in each of these zones.

http://www.slb.com/services/characterization/reservoir/wireline/modular_formation_dynamics_tester.aspx