System and method of grid generation for discrete fracture modeling

摘要

Computer-implemented systems and methods are provided for generating accurate grids that can be used for simulation of highly complex subsurface reservoirs, such as fractured subsurface reservoirs. A representation of a fractured subsurface reservoir and an explicit discrete fracture represented within the fractured subsurface reservoir are provided. The representation of the fractured subsurface reservoir is decomposed into polyhedral cells. Interfaces between the polyhedral cells are selected to approximate the discrete fracture explicitly represented within the fractured subsurface reservoir. The selected interfaces are used to produce a grid that can be used for constructing a simulation model of the fractured subsurface reservoir.

主权项

1. A computer-implemented method for generating a grid used to construct a simulation model of a fractured subsurface reservoir, the method comprising:
providing a representation of a fractured subsurface reservoir, a network of fractures represented within the fractured subsurface reservoir, a rock matrix represented within the fractured subsurface reservoir, and a geometry of each of the fractures; constructing a uniform, structured lattice comprising a plurality of polyhedral cells representing the rock matrix, the polyhedral cells having cell-to-cell interfaces in between the polyhedral cells; refining a portion of the polyhedral cells representing the rock matrix of the uniform, structured lattice, wherein the polyhedral cells being refined are in vicinity of the network of fractures, and wherein refining occurs after constructing; selecting, for each of the fractures, a plurality of the cell-to-cell interfaces in between the polyhedral cells representing the rock matrix and that are adjacent to the fracture to form a continuous interfaces path approximating the geometry of the fracture, wherein selecting occurs after refining; associating each of the continuous interfaces paths formed with predetermined fracture properties, wherein associating occurs after selecting; and outputting a grid comprising each of the continuous interfaces paths associated with the predetermined fracture properties for use in constructing a simulation model of the fractured subsurface reservoir.