Patent ID: 7274993
Filing Date: 2007-09-25
Classification: E21B,G01V

Abstract:
1. A method for forming an optimum stochastic model representative of a spatial distribution, in a heterogeneous underground zone, of at least one physical quantity based upon measured dynamic data, representative of fluid displacements in a medium, obtained from the underground zone, comprising simulating an initial realization of the stochastic model, optimizing that initial realization by means of an iterative minimization process of an objective function, measuring, on each iteration, a difference between the measured dynamic data and simulated dynamic data, the simulated dynamic data being simulated using a flow simulator, and wherein the optimization comprises gradually modifying the initial realization towards an optimum realization, wherein the gradual modification, upon each iteration, comprises: constructing an intermediate realization utilizing a continuous distribution perturbation process applied to the initial realization; and gradually modifying the initial realization by replacing the initial realization by the intermediate realization.