| 增强型地热系统（EGS）的裂隙模拟方法 |
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| 引用本文： | 王洋,张可霓.增强型地热系统（EGS）的裂隙模拟方法[J].上海地质,2011,32(3):77-80. |
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| 作者姓名： | 王洋 张可霓 |
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| 作者单位： | 北京师范大学水科学研究院,北京,100875 |
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| 基金项目： | 美国伯克利实验室与科罗拉多矿业大学共同项目“增强型地热系统(EGS)的THMC耦合模拟研究” |
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| 摘 要： | 增强型地热系统（EGS）是在干热岩技术基础上提出来的一个清洁能源概念,水力压裂建立人工热储是开采地下干热岩热能的有效方法之一。利用TOUGH2系列软件对增强型地热系统进行模拟,具体介绍了对水压致裂过程中裂隙网络模拟的处理方法。裂隙中的水流可以采用不同的概念模型,最为常见的模型包括双空隙率、双渗透率、多重相互作用连续统一体（MINC）以及有效连续统一体（ECM）,这些模型明确了对离散的裂隙和基质的模拟方法。应根据基质的渗透性和裂隙的性质灵活地选择裂隙处理方法,也可将不同方法结合起来使用。提出了几种有效的混合模拟方案,对将来高温岩体地热开发具有重要意义。
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| 关 键 词： | 地热能 干热岩 增强型地热系统 水力压裂 裂隙 TOUGH2 |
Modeling Approaches for Fractures in Enhanced Geothermal System（EGS） |
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| Authors: | WANG Yang ZHANG Ke-Ni |
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| Institution: | WANG Yang,ZHANG Ke-Ni(College of Water Sciences,Beijng Normal University,Beijing 100875,China) |
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| Abstract: | The concept of Enhanced Geothermal System（EGS） is proposed based on the dry hot rocks technology.Hydraulic fracturing has become one of the effective methods for establishing artificial geothermal reservoir to explore underground hot dry rock energy.In this paper,utilization of TOUGH2 code for simulating EGS is explored.We also introduce the fracture network simulation approaches in the process of hydraulic fracturing.Conceptual models for the fracture flow of an EGS are investigated.The most common models include discrete fracture,dual-porosity,dual permeability,Multiple Interacting Continua（MINC） and Effective Continuum（ECM）.These models use different schemes in treatment of fracture and matrix for numerical simulation.It is very flexible in selecting the fracture treatment methods or combination of different methods based on the permeability of the matrix rock and other properties of the fractured rock.In this paper,several effective combination conceptual models are proposed. |
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| Keywords: | geothermal energy hot dry rock Enhanced Geothermal System hydraulic fracturing fracture TOUGH2 |
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