METHOD FOR VALIDATING A TRAINING IMAGE FOR THE MULTIPOINT GEOSTATISTICAL MODELING OF THE SUBSOIL

摘要

According to the invention, a training image denotes, for each cell of a first three-dimensional grid, a respective type of geological facies assigned to said cell. For each cell of a second three-dimensional grid, the morphology of which is matched to estimated geological horizons, the well data comprise a respective type of geological facies estimated for said cell. Two-dimensional patterns, each of which is defined along a respective geological horizon and includes, in a cell containing the intersection of a well with said geological horizon, the type of geological facies estimated for each cell, are defined. The instances of the identified two-dimensional patterns are counted in the training image so as to verify the ability of the training image to account for correlations between wells.

主权项

1. A method for preparing a training image for modeling an area of the subsoil by a multipoint geostatistical technique, the method comprising:
constructing the training image on a first three-dimensional grid of cells, the training image giving, for each cell of the first grid, a respective type of geological facies assigned to said cell; and verifying representativeness of the training image with respect to well data obtained from observations conducted in a plurality of wells drilled in the area of the subsoil, the well data referring to a second three-dimensional grid of cells having a morphology adapted to estimated geological horizons in the area of the subsoil, the well data including the types of geological facies that are respectively estimated from the observations for the cells of the second grid located along the wells,wherein verifying representativeness of the training image with respect to the well data includes an inter-well verification which comprises:
identifying two-dimensional patterns in the well data, each two-dimensional pattern being defined along a respective geological horizon and including, in a cell containing an intersection of a well with said geological horizon in the second grid, the type of geological facies estimated for said cell; and counting, in the training image, occurrences of the two-dimensional patterns identified.