Patent ID: 7483822

Claim:
A method for deforming a model describing a heterogeneous underground zone comprising geologic objects including at least one of channels or fractures, and allowing a best simulation of a spatial configuration, of the geologic objects defined by physical quantities, that is constrained to measured dynamic data representative of fluid displacements in the underground zone, by imposing a continuity in evolution of the geologic objects comprising: carrying out an iterative optimization process from realizations each including at least one of the geologic objects whose number is drawn from a Poisson random variable of determined mean and an objective function measuring a difference between the measured dynamic data and simulated dynamic data simulated by means of a flow simulator from a combined realization by adjustment of combination coefficients; and continuing the iterative optimization adjustment process until an optimum realization is obtained, wherein upon each iteration a combined realization is obtained by combination, of an initial realization of N1(t) geologic objects corresponding to a first mean value and of at least a second independent realization of a same model of N2(t) geologic objects corresponding to a second mean value, the combination is such that a number N(t) of geologic objects of the combination has a mean value equal to a sum of the first and of the second mean value, and for a same mean value of the combination, first and second mean values are varied concomitantly to gradually vary a number of the geologic objects for each of the combined realizations and a size of the geologic objects is associated with a procedure for generating the number of objects so as to make the geologic objects appear or disappear progressively, while gradually deforming the model describing the underground zone.