I think it would be correct to say that there is a relationship...

I think it would be correct to say that there is a relationship between the size[volume] of the deposit and the rate at which the pressure falls and flow increases.
A small volume under pressure would lose pressure much more quickly as the choke is increased than a massive deposit which would show virtually no pressure drop as the chokes were ramped up to reveal the massive potential flow.

If that is right and it seems logical, then using the oil viscosity and that flow/pressure ratio of the different chokes, they would already have a good idea of the extent of the deposit.

Other factors would be oil temperature, material composition of the reservoir and the restriction of the bore casing perforations but they would already have that info.

Can't believe how low the price is.