Not sure what you try to tell with the number of wells there but...

Not sure what you try to tell with the number of wells there but there must be plenty. No record tell Cua Lo is top of the diapir structure but I saw faults. Well, since your concern (and me too) is about the CO2 content, I would say there are possibility. NEN said it will evaluate the hydrocarbon presence with MDT before flow testing. I believe they shouldn't test a high CO2 well. Also, these reservoir may have different gas compositions any way. Let find out, no venture no gain.