I need to do a quick mbal on a gas condensate field.
Unfortunately I have only sales volumes available (gas , condensate and LPG)
Normally I should use raw gas data and condensate.

As I know condensate means C5+ fractions that is separated naturally in surface conditions.
LPG is C3,C4 fraction and you need a plant in order to separate this.
Also there is a quantity of gas that is lost during separation process.

How can I go back to original raw gas data taking into account sales data I have?