Co-occurrence correlation function-based porous medium three-dimensional modeling method

Abstract

The invention discloses a co-occurrence correlation function-based porous medium three-dimensional modeling method. According to the method, a new correlation function is designed to be adopted as a constraint function in reconstruction to replace an original two-point probability function in a porous medium three-dimensional modeling process; and a simulated annealing algorithm framework is used in combination, so that a corresponding fast update algorithm is designed; and therefore, three-dimensional reconstruction is performed. The co-occurrence correlation function-based porous medium three-dimensional modeling method is characterized in that the concept of the co-occurrence correlation function and a porous medium three-dimensional modeling algorithm with the co-occurrence correlation function adopted as an objective function are provided; as for the problem that whenever points are exchanged, the co-occurrence correlation function of a whole structure is required to be calculated again can be solved, and the corresponding fast update algorithm is provided, and therefore, reconstruction speed is increased; and the co-occurrence correlation function is adopted as a constraint condition, and therefore, the co-occurrence correlation function-based porous medium three-dimensional modeling method has the advantages of more accurate reconstruction result, no obvious increased in time and high application value compared with a traditional two-point correlation function.

Description

technical field [0001] The invention relates to a three-dimensional modeling method for a porous medium based on a two-dimensional image, in particular to a modeling method for a porous medium based on a symbiotic correlation function, and belongs to the technical field of image processing. Background technique [0002] Core is a common type of porous medium. In the field of petroleum geology, the microstructure of the core has an important influence on its macroscopic physical properties. The digital core is a computer image processing technology that depicts the microstructure of the core in the form of an image, which can reflect the pore microstructure at the pore size level, so as to calculate the acoustic and electrical properties of the core and conduct seepage simulation process, analyze flooding. It is an effective way and method for core analysis to analyze the distribution law of oil and water changes in the replacement process. Using two-dimensional images and t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of large difference between the reconstructed structure and the real structure caused by the use of low-order statistics in simulated annealing. It provides a three-dimensional modeling method for porous media based on co-occurrence correlation functions, and proposes a method that can express image texture features. The co-occurrence correlation function is used as the objective function of the reconstruction process, and a fast update algorithm is further proposed to solve the speed problem in the reconstruction algorithm, which speeds up the reconstruction speed

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