Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks

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Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/108683

Title:	Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks
Authors:	李奕賢;Lee, I-Hsien;Ni, Chuen-Fa
Contributors:	環境研究中心
Keywords:	Carbon dioxide;CO2 injection;Computer simulation;computers;Discrete fracture network;Finite element method;Formations;Fracture intensity;Fracture mechanics;Fractured rock;Migration;Permeability;Rocks;simulation models;topology;Unstructured mesh generation;wells
Date:	2015-08-01
Issue Date:	2026-04-23 15:02:09 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： The fractures and pores in rock formations are the fundamental units for flow and contaminant-transport simulations. Modeling and meshing a fractured rock system are challenging tasks because mesh generations of fractured networks typically involve complex procedures in conducting topological transformations, and the modeling of such a complex mesh system is computationally expensive. The objective of this study was to develop a three-dimensional (3D) discrete fracture network (DFN) model and an associated unstructured mesh generation (UMG) model to simulate flow and transport for fractured rock systems. This study employed coupled multicomponent, multiphase fluids in a 3D porous and fractured media simulator (the TOUGH2/ECO2N model) to analyze flow and CO2 migration in fracture formations. The developed DFN and UMG models were first tested using a single and horizontal fracture plate to evaluate the results based on various mesh types. The models were then implemented in multiple DFN realizations to assess the behavior of equivalent permeability of a rock block influenced by various fracture intensities. By exploiting the well-developed TOUGH2/ECO2N model, the developed DFN and UMG models were applied to problems of flow and CO2 migration in fracture formations. The simulation results showed that the developed models can capture behaviors of the flow and transport in fractured formations. Different types of mesh led to slight variations in pressure distribution near injection wells. However, such pressure variations can be reduced with refined mesh around the injection wells. The results based on 52 DFN realizations indicated that the value of equivalent permeability for the simulated rock block shows three to four orders of magnitudes lower than the value of the specified fracture permeability. The injection of supercritical CO2 exhibited a rapid migration of gaseous and aqueous phase CO2 along connected fractures. •We develop a three-dimensional discrete fracture network model.•We develop an unstructured mesh generation model for fractured rock systems.•Different types of mesh lead to slight variations in distributions of pressure and CO2 gas saturation.•Local mesh refinement can improve the accuracy of triangular prism mesh. 出版者： Elsevier Ltd 出版日期： 2015-08 出處： Computers & geosciences, 2015-08, Vol.81, p.64-77 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2015 Elsevier Ltd 識別號： ISSN: 0098-3004 識別號： EISSN: 1873-7803 識別號： DOI: 10.1016/j.cageo.2015.04.012
Appears in Collections:	[Center for Environmental Studies] journal & Dissertation

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