Abstract: The present invention relates to a method for producing a three-dimensional characteristic model of a rock sample for analysis of the spatial and physical characteristics of materials subsequent to the processing of images obtained by means of computer tomography. The method includes producing a three-dimensional tomographic image of a sample of material, identifying areas where the structure of the material is homogeneous, assigning a particular material density value to each such area, assigning a particular porosity value to each pixel, assigning a particular absolute permeability value to each pixel, forming a three-dimensional characteristic model on the basis of the porosity and permeability values of each pixel, and calculating the absolute permeability of the entire sample or of a portion thereof in any direction by means of computational fluid dynamics.