And to your followup pm question
Thanks, and it is clear. My question is this now : Can you have water saturates the primary gas cap?
I am not 100% clear on what you are asking.... if you are asking if water can move up into the gas cap volume as the pressure depletes, then the answer is absolutely. If you are asking can you have residual (connate) water saturation in the gas cap, then the answer is also absolutely - water/gas capillary pressure works exactly the same way as water-oil capillary pressure, albeit with different IFT and contact angles along with far greater density differences, so you still expect to see some sort of transition zone through to Swir - whether or not this transition zone is relevant compared to your reservoir size and other uncertainties depends upon many things including permeability & relief.