Abstract: At present, the optimum method is the method used by oil-fields to reflect the physical parameters of the reservoir. But when the design variates and the suitable constraints happen to perturb, unstable optimum solution and unsatisfactory reservoir interpretation result. In this paper, to solve the problem, the nonlinear sensitivity theory is applied to design a low sensitivity model for the reservoir optimum interpretation. This model reduces interference greatly. Compared with the practical data drawn from a few wells, the results from the computation are satisfactory.

Key words: reservoir, sensitivity, optimum