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摘要: 增强型（或工程型）地热系统（简称EGS）是指从地下3~10km低渗透岩体中经济开采深层地热的人工热能系统，作为目前地热领域的重要发展方向，其研究受到发达国家的高度重视，但我国还基本处于空白。在EGS运行过程中，高温岩体及裂隙受到温度场（T）、渗流场（H）、应力场（M）、化学场（C）的耦合作用，其结果直接影响整个系统的设计和运行。本文根据对EGS最基本的物理—化学过程分析，讨论了任意两场之间的相互作用，指出了三场耦合应考虑的重点及四场耦合现阶段研究的不完善性，最后综述了目前国际上用于解决EGS多场耦合问题的模拟软件研究进展。Abstract: The enhanced geothermal system is defined as engineering reservoirs that have been created to economically extract heat for electric power production at depth ranging from 3 to 10 km. As an important field of current geothermal development, the research is of interest to many developed countries, but China is still in its infancy. During the EGS operation, the design and operation of the fractured system are influenced by thermal-hydrologic-mechanical-chemical processes. This paper presents a brief analysis of the above four fields in EGS. The basic two-field coupling (T-H) is examined and the importance of T-H-M and the insignificance of T-H-M-C coupling are discussed. Related research progresses in numerical simulation are also introduced.
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Key words:
- EGS /
- T-H-M-C coupling /
- numerical simulation /
- TOUGH2 /
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