Abstract: A method predicts the asphaltene precipitation envelope of a fluid consisting of stock tank oil and dissolved gas. The method comprises comparing a solubility parameter of the fluid, ?fluid, and an onset solubility parameter of the fluid, ?onset(fluid), across a range of pressures, to predict pressures at which asphaltene precipitation will be observed, ?fluid and ?onset(fluid) are calculating using a correction factor, Fcorrection. Fcorrection is determined according to formula (1): Fcorrection=?STO(physical)/?STO(solvent power)??(1) where: ?STO(physical) is an estimate of the solubility parameter of the stock tank oil based on a physical property of the stock tank oil, and ??STO(solvent power) is an estimate of the solubility parameter of the stock tank oil based on the solvent power of the stock tank oil.