Patent ID: 7657413

Claim:
A method for constructing a reservoir model representative of an underground reservoir, including discretizing said underground reservoir by a set of grid cells, and associating with said reservoir model a permeability field constrained by a priori geologic data and production data or pressure data obtained from well tests collected in said underground reservoir comprising: a) constructing an initial reservoir model including generating a permeability field in accordance with a stochastic model coherent with the a priori geologic data; b) identifying zones inside said underground reservoir; c) calculating permeabilities of said zones, using a simulator to simulate fluid flows for estimating simulated production data or simulated pressure data and estimating corrections of said permeabilities for reducing a difference between said production data or pressure data obtained from well tests and said simulated production data or simulated pressure data; d) propagating said corrections to said set of grid cells of said reservoir model by an iterative optimization process comprising minimizing a function which depends on said corrections, using a technique of gradual deformation of realizations of said stochastic model; and e) using said reservoir model, including said corrections propagated to said set of grid cells, to develop said underground reservoir.