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The equivalent discrete fracture networks based on the correlation index in highly fractured rock masses
Abstract In the numerical simulations of highly fractured geological formations, discrete approaches are considerably promising and adequate to describe fluid flow in detail. However, the computational complexity increases dramatically with a greater number of fractures. This becomes the primary limitation for field-scale applications. In this study, a correlation index is for the first time introduced to evaluate the significance of individual fractures, and an equivalent model is proposed to mimic the original domain with a density-reduced one. By an equivalent permeability factor, the suggested model simplifies computational complexity, but compromises result precision to minor extent. This approach is validated in typical discrete fracture networks generated with stochastic fractal models. Effects of fracture geometry are discussed based on various distribution patterns. This method improves mesh quality when dealing with a fracture-matrix domain. It is also capable of optimizing reservoir design through fast and accurate estimations of gas productivity under different boundary conditions.
Highlights A correlation index is defined to evaluate the significance of individual joints to overall transmissibility. An equivalent fracture skeleton is derived based on the correlation index. The effectiveness of equivalent models is discussed in different fracture patterns. The discontinuity equivalence model is validated in fast and robust simulations of fractured-matrix systems.
The equivalent discrete fracture networks based on the correlation index in highly fractured rock masses
Abstract In the numerical simulations of highly fractured geological formations, discrete approaches are considerably promising and adequate to describe fluid flow in detail. However, the computational complexity increases dramatically with a greater number of fractures. This becomes the primary limitation for field-scale applications. In this study, a correlation index is for the first time introduced to evaluate the significance of individual fractures, and an equivalent model is proposed to mimic the original domain with a density-reduced one. By an equivalent permeability factor, the suggested model simplifies computational complexity, but compromises result precision to minor extent. This approach is validated in typical discrete fracture networks generated with stochastic fractal models. Effects of fracture geometry are discussed based on various distribution patterns. This method improves mesh quality when dealing with a fracture-matrix domain. It is also capable of optimizing reservoir design through fast and accurate estimations of gas productivity under different boundary conditions.
Highlights A correlation index is defined to evaluate the significance of individual joints to overall transmissibility. An equivalent fracture skeleton is derived based on the correlation index. The effectiveness of equivalent models is discussed in different fracture patterns. The discontinuity equivalence model is validated in fast and robust simulations of fractured-matrix systems.
The equivalent discrete fracture networks based on the correlation index in highly fractured rock masses
Ma, Guowei (Autor:in) / Li, Tuo (Autor:in) / Wang, Yang (Autor:in) / Chen, Yun (Autor:in)
Engineering Geology ; 260
08.07.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Equivalent discrete fracture networks for modelling fluid flow in highly fractured rock mass
| British Library Online Contents | 2017
Modelling of fractured rock masses
| British Library Conference Proceedings | 2002