增强型地热系统的开发——以法国苏尔士地热田为例

Development of Enhanced Geothermal Systems(EGS)——With Soultz Geothermal Farm in France Serving as an Example

增强型地热系统是指从地下3～10 km低渗透岩体中经济开采深层地热的人工热能系统,主要用于发电。目前地热技术是再生能源领域的重要发展方向,而对其进一步研究受到发达国家的高度重视,但我国在该领域研究还基本处于空白。法国的苏尔士地热田是欧洲目前仍在运行的增强型地热系统(EGS)现场试验场,在20多年的实践过程中产生了大量的科研成果。本研究通过回顾该地热田在开发阶段取得的成果,得到其地质勘探、人造储层、循环测试等方面的主要结论,以便为国内EGS科学研究及项目实施提供参考。

Enhanced geothermal systems denote the artificial thermal energy systems economically exploiting the geothermal energy at a depth of 3 to 10 meters under the ground surface from low penetration rocks and mainly used for power generation.As the currently important development direction in the geothermal energy domain,their investigation gains a wide attention in the developed countries but in China basically remains virginal ground.Soultz geothermal farm,which is located in the northeast part of France,is regarded as an important representative of the EGS currently still in operation in Europe and conducting on-site tests.During its operation in more than 20 years,it has produced a great quantity of achievements in scientific research.By looking back the main understandings of the geothermal farm obtained during its development process,the aurthors have summarized the main conclusions concerning the geological prospecting,artificially-made storage layer and circulation testing etc.,thus offerring refernce for scientific research and project implementation of the EGS in China.