Method and system for randomly generating porous medium model

A system for randomly generating a porous medium model for simulating geological reservoirs, implemented in a computer system using a set of computer-executable instructions, comprising a model acquisition module, an initialization module, a discrete module, an edge extraction module, a filling module, a collision detection module, an update module, a model generation module and an output module;

• the model acquisition module is used for setting a porosity, resolution and a size of a pre-generated porous medium model;
• the initialization module is used for initializing the porous medium model and generating position information of particles;
• parameters of the initialization comprise a model porosity and a model size;
• and the position information comprises position coordinates and rotation angles of particle centers;
• the discrete module is used for generating and combining Fourier parameters based on setting of the initialization module and a Fourier series expansion, obtaining a particle profile parameter equation of a porous medium, and performing discretization to obtain discrete particle profile data;
• and a process of obtaining the parameter equation is:
• establishing a global coordinate system representing a pore space and a local coordinate system representing a particle space;
• based on the local coordinate system, expanding the Fourier series to obtain a single-valued function;
• based on the single-valued function, obtaining a particle profile parameter equation of the local coordinate system;
• converting the particle profile parameter equation of the local coordinate system into a particle profile parameter equation of the global coordinate system;
• and
• based on the particle profile parameter equation of the global coordinate system, obtaining the particle profile parameter equation of the porous medium;
• the edge extraction module is used for carrying out grid mapping on the discrete particle profile data and extracting particle profile edges;
• the filling module is used for carrying out local marking and area search on the particle profile edges to obtain filled particles;
• the collision detection module is used for carrying out a collision detection on the filled particles and preset particles, and determining effectiveness of a particle generation position;
• the update module is used for presetting a cyclic pop-up condition, and if a judgment result of the collision detection module meets the cyclic pop-up condition, executing the model generation module;
• otherwise, updating the Fourier parameters and returning to the update module;
• the model generation module is used for adding a particle configuration meeting the cyclic pop-up condition to a model generation area and storing the parameters, and constructing the porous medium model with an optimal particle shape using the computer;
• and the output module is used for determining whether the porous medium model generated in the model generation module meets preset generation requirements, and if so, outputting a porous medium model;
• otherwise, returning to the initialization module.