1. A method of simulation of production of an oil reservoir using a computer, comprising: a) providing a computer-based flow simulator utilizing physical data obtained from measurements of the oil reservoir; b) operating the flow simulator of step a) to provide production values at points selected from the oil reservoir and providing a computer-based first model representing production of the reservoir as a function of time by adjustment of the production values provided by the flow simulator based upon simulated data without utilizing physical data obtained from measurements of the oil reservoir, the first model accounting for parameters which influence the production of the reservoir; c) selecting at least one new production value associated with a point located within an area of the reservoir selected as a function of non-linearity of production in the selected area of the reservoir which is obtained from operating the flow simulator of step a); and d) providing a computer-based second model by adjusting the first model so that a response of the second model at the selected point within the selected area corresponds to the at least one new production value based upon simulated data without utilizing physical data obtained from measurements of the oil reservoir.