• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Analysis of the microseismicity induced by fluid injections at the EGS site of Soultz-sous-Forets (Alsace, France): Implications for the characterization of the geothermal reservoir properties
【24h】

Analysis of the microseismicity induced by fluid injections at the EGS site of Soultz-sous-Forets (Alsace, France): Implications for the characterization of the geothermal reservoir properties

机译：Soultz-sous-Forets EGS站（法国阿尔萨斯，法国）的流体注入引起的微震分析：对地热储层性质表征的启示

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In June/July 2000, a hydraulic stimulation experiment took place at the geothermal EGS site of Soultz-sous-Forets ( Alsace, France) in order to enhance the permeability of the fractured granitic massif at 5 km depth. As it is well known that fluid injections tend to induce microseismic events, a downhole and a surface seismological network have been installed to monitor the seismic activity during the stimulation test. 23400 m 3 of fluid have been injected in the rock volume through the open-hole section ( 4400 m-5000 m) of the well GPK2 at increasing rates of 30 l. s(-1), 40 l. s(-1) and then 50 l. s(-1). More than 7200 microseismic events in the magnitude range -0.9 to 2.6 have been precisely located through a simultaneous inversion of the seismic velocity structure and location parameters. The analysis of the behavior of the seismicity relative to the hydraulic parameters gives important information about the geothermal reservoir. It appears that the evolution of the seismicity strongly depends on the variations of the injection rate: An increase or a decrease leads to changes of the velocity structure, the number and magnitude of microseismic events. This involves different hydro-mechanical processes between the fluid flow and the fracture planes, which will control the final shape of the microseismic cloud. Moreover, the study of the variations of the b-value with time suggests that the stimulation experiment produces a large proportion of small earthquakes, but records of events of magnitude higher than 2 indicate that fluid injection could reactivate structures whose dimensions allow the generation of such earthquakes.
机译：2000年6月/ 2000年7月，在Soultz-sous-Forets的地热EGS站点（法国阿尔萨斯）进行了水力增产实验，以提高5 km深度裂隙花岗岩的渗透性。众所周知，流体注入倾向于引起微地震事件，已经安装了井下和地面地震网络以监测在增产测试期间的地震活动。通过GPK2井的裸眼段（4400 m-5000 m）将23400 m 3的流体注入岩体中，流量增加了30 l。 s（-1），40升。 s（-1），然后50 l。 s（-1）。通过同时反演地震速度结构和位置参数，已经精确定位了7200多个范围在-0.9至2.6范围内的微地震事件。相对于水力参数的地震活动性分析提供了有关地热储层的重要信息。看来地震活动性的演变在很大程度上取决于注入速率的变化：增大或减小会导致速度结构，微地震事件的数量和大小的变化。这涉及流体流和裂缝平面之间的不同水力机械过程，这将控制微地震云的最终形状。此外，对b值随时间变化的研究表明，刺激实验会产生较大比例的小地震，但是记录大于2的事件表明，流体注入可以重新激活其尺寸允许生成此类地震的结构。地震。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：[email protected]

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号

OSZAR »