Patent Document ID: 20050010383
Application ID: 10615772
Patent Flag: 0

Claim One:
1 ) A method for forming iteratively a model representative of the permeability field of a heterogeneous medium, discretized by a grid pattern, such as an underground zone, constrained by a priori geologic data and dynamic data collected in the medium by measurements and observations obtained beforehand, characterized in that it includes: a first stage comprising: a) generating an initial model of the permeability in accordance with a Gaussian or related stochastic model, coherent with the a priori geologic data, and carrying out, by means of a suitable simulator, a simulation of the fluid flows, b) identifying zones inside the reservoir, calculating the effective permeabilities of these zones and, from the simulator results, estimating the corrections to be brought to these effective permeabilities to improve calibration in relation to said data, and a second stage comprising: c) propagating said corrections to the whole of the grid cells of the permeability field, by means of an iterative optimization process comprising minimizing a functional which quantifies the difference between the effective permeabilities required to obtain said calibration and the effective permeabilities calculated for the permeability field considered, using a technique of gradual deformation of realizations of the stochastic model.