METHOD FOR SETTING THE HISTORY OF A GEOLOGICAL MODEL BY GRADUAL MODIFICATION OF THE PROPORTIONS OF THE LITHOLOGICAL FACES

摘要

- Method for gradually modifying a geological model representative of an underground reservoir in order to respect fixed average proportions of these lithological facies.- A group of facies, called selection, and a subgroup of facies, called association, are selected. A transformation parameter is defined by the ratio between the average proportions of the facies of the association and those of the selection. As part of a history calibration, a difference is measured between measured dynamic data values and calculated values using a flow simulator from the geological model. An optimization algorithm is used to derive a new value of the transformation parameter which minimizes this difference and this transformation is applied to the lithological facies of the selection. The change can be applied to the entire model or to a given area.