A three-dimensional polygonal mesh subdivision method and system

Abstract

The application discloses a three-dimensional multi-prism grid dissection method and system, and the method comprises the following steps: obtaining geological data of a target oil reservoir and performing data processing; projecting the geological body to a two-dimensional plane, and performing point distribution operation according to the geological body type to obtain an initial scattered point set; constructing a density field and performing point distribution by using a front advance algorithm, generating a two-dimensional reference grid layer by triangular dissection and its dual transformation; constructing a spring analogy model, taking the minimization of a global energy equation as a target, combining with a grid displacement boundary constraint condition, solving the displacement of each grid node to obtain a deformed two-dimensional grid; performing layered stretching and projection according to the projection position of the geological body, generating a three-dimensional multi-prism matrix grid, embedding a fracture and fault grid therein, and obtaining a complete three-dimensional geological model of the target oil reservoir. The layered structure of the grid is maintained, the simplicity of flow calculation is ensured, and the fault-fracture-boundary system grid with complex intersection relationship and dip angle can be simulated.

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