Patent ID: 8532969

Claim:
A numerical simulation method for characterizing fluid channelling along fractures of reservoirs, comprising the steps of: (1) determining a region of interest for numerical reservoir simulation research and creating a boundary trace file of a simulation region boundary, wherein the boundary trace file comprises an amount of trace points, a serial number and X, Y coordinates of each trace point, the region of interest is an enclosed area formed by connecting each trace point in turn; (2) forming a trace file of fractures which influence a fluid flow, based on a geologic research, wherein the trace file of fractures consists of a total amount of the fractures, a serial number and aperture of each fracture, corresponding trace point coordinates and vertical ranges of simulation layers crossed by each fracture; (3) based on trace data of the simulation region boundary obtained in step (1) and trace information of each fracture trace segment obtained in step (2), making an unstructured grid division using a pre-processing software of numerical simulation, wherein divided grids are classified into two types: non-fracture grids and discrete fracture grids, and two sides of a horizontal projection for a discrete fracture grid is parallel to a corresponding fracture trace segment; (4) based on the grids obtained in step (3) and the geologic research, building a static model for the numerical reservoir simulation by an interpolation method, wherein the static model consists of a specification of geometry of computational grid (location of grid block corners), and of rock properties (effective thickness, porosity, absolute permeability) in each grid block; (5) adjusting the static model obtained in step (4), and modifying a permeability of a grid face crossed by a fracture for each discrete fracture grid, with a formula of: permeability=(fracture aperture) 2 /12, here an unit of the fracture aperture is μm, and an unit of the permeability is Darcy(μm 2 ); (6) based on the adjusted static model in step (5), creating a reservoir simulation model, wherein the reservoir simulation model comprises grid geometry data (location of grid block corners), reservoir rock properties, fluid physical parameters, relative permeability and capillary pressure data, positions of injection and production wells, dynamic data, process parameters and convergence control parameters needed by solving iteratively; (7) improving a dual porosity numerical simulation software to be capable of accepting unstructured grids formed in step (3); and (8) running the reservoir simulation model obtained in step (6) with a unstructured grid simulator obtained in step (7), as a result, a fluid channelling along fractures can be characterized effectively.