Method, software and computer system for making a 3d...

G - Physics – 01 – V

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G01V 11/00 (2006.01)

Patent

CA 2711926

The invention relates to a method, software and a computer system for generating three-dimensional geological systems, in particular a reservoir, wherein said method comprises the following steps: providing a set of proportional models, each of said proportional models including uvw cells to which are associated respective values of facies occurrence probabilities, said values defining a set of probability values; estimating (S100) for each cell a facies probability distribution rule from the sets of probability values so that each of the estimated rules corresponds to the set of provided models; extracting from the initially provided proportional models or providing space consistency data; creating (S200) a new set of proportional models from the estimated rules of facies probability distribution, including the drawing of new facies probabilities for each of the cells, the drawing being further limited by space consistency data; and creating (S300) a new set of geological models by stochastic simulation of the facies and the petrophysical properties from the new set of proportional models thus created.

La présente invention concerne un procédé, un programme et un système informatique de construction de modèles géologiques tridimensionnels, par exemple de réservoir, le procédé comprenant les étapes : - de fourniture d'un jeu de modèles en proportions, chacun des modèles en proportions comprenant des cellules uvw auxquelles sont associées des valeurs respectives de probabilité d'occurrence de faciès, lesdites valeurs formant un ensemble de valeurs de probabilités; - d'estimation (SlOO), pour chacune des cellules, d'une loi de distribution de probabilités de faciès, à partir des ensembles de valeurs des probabilités, de sorte que chacune des lois estimées reflète le jeu de modèles fourni; - d'extraction, à partir des modèles en proportions fournis initialement, ou de fourniture de données de cohérence spatiale; - de création (S200) d'un nouveau jeu de modèles en proportion, à partir des lois de distribution de probabilités de faciès estimées, comprenant un tirage de nouvelles probabilités de faciès pour chacune des cellules, le tirage étant en outre contraint selon les données de cohérence spatiale; et - de création (S300) d'un nouveau jeu de modèles géologiques, par simulation stochastique des faciès et des propriétés pétrophysiques à partir du nouveau jeu de modèles en proportion créé.

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