Thanks for the reply,

I'm sorry if my question was wrong. i dont need to know about the button to help me make a PVT model but i mean i need the theory to make the represent PVT if we have a lot of PVT sample in same formation/reservoir.
In PVT model i think we have to match the model to lab data that we have. but should we have to match all the sample to the PVT model that we made?
if you have some references theory it would be helpful.

thanks.