Determination Method of Porous Media Representation Unit Based on Variation Function and Porosity

Abstract

The invention provides a method for determining porous medium REV (representative elementary volume) on the basis of variogram function and porosity, relates to the technical field of image processingand solves the technical problem about REV determination. The method comprises steps as follows: a variogram function curve of pores of a porous medium in a three-dimensional rectangular coordinate system is drawn according to a three-dimensional structural map of the porous medium; lengths of a range of the variogram function curve on three coordinate axes are calculated according to resolutionratio of the three-dimensional structural map of the porous medium, and a cuboid template is constructed with the three lengths serving as length, width and height; the cuboid template is traversed inthe three-dimensional structural map of the porous medium, and the actual REV is determined according to difference of porosity of the porous medium contained in the cuboid template and overall porosity of the porous medium. The method can be widely applied to some engineering and science fields such as oil-gas exploration and development, geological analysis and the like.

Description

technical field [0001] The invention relates to an image processing technique, in particular to a technique for determining a porous medium characterizing unit body based on a variation function and porosity. Background technique [0002] The research ranges involved in fluid transport in porous media include molecular level, microscopic level and macroscopic level. Research based on both molecular and microscopic levels has limitations. Therefore, the macro method (based on the macro level) is more widely used in engineering practice because of its advantage of not needing to know the detailed information of fluid molecules and media. The macroscopic method assumes that both fluid and solid in porous media are continuous media, and that they are distributed continuously at all points in space, and that fluid and solid media can interact. When constructing the corresponding mathematical model, it is necessary to statistically average the parameters of a certain point in th...

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Problems solved by technology

However, for heterogeneous porous media, the average value of the obtained porous media parameters tends to change with the size of the porous media. The existing REV determination method is less effective for heterogeneous porous media. The selected The basic parameters of the REV will change greatly with the change of space

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