It's necessary to solve the problem of fine characterization and efficient simulation of three types of fractures, i.e. natural fractures, artificial fractures and complex fracture network, for the development optimization design and scheme adjustment of unconventional oil and gas reservoirs. This paper describes a set of efficient and practical fracture characterization techniques for reservoir numerical model, which integrates various numerical simulation methods of fractures in different scales, including single-medium equivalent model, LGR model, double-medium model, MINC model, non-structural discrete fracture model and embedded discrete fracture model. For different reservoir types and different fracture dimensions, different models are adopted to depict the spatial distribution and fluid flow characteristics of fracture-matrix, matrix-matrix and fracture-fracture. The application in a shale gas shows that the set of fracture characterization methods can accurately describe the shape, geometric characteristics and spatial position of natural fractures, artificial fractures and fracture network. The methods also can simulate the fluid flow characteristics in multi-scale fracture network efficiently, and accurately predict the productivity of fracture network.

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