• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Seismological research letters >Seismic Anisotropy Reveals Stress Changes around a Fault as It Is Activated by Hydraulic Fracturing
【24h】

Seismic Anisotropy Reveals Stress Changes around a Fault as It Is Activated by Hydraulic Fracturing

机译：Seismic Anisotropy Reveals Stress Changes around a Fault as It Is Activated by Hydraulic Fracturing

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

摘要

Subsurface stress conditions evolve in response to earthquakes or fluid injection. Using observations of an induced seismicity sequence from a dense local array, anisotropy analysis is employed to characterize stress changes around a fault. The dataset comprises high signal‐to‐noise ratio S‐wave data from 300 events, ranging in magnitude from −0.45 to 4.1, recorded on 98 three‐component geophones cemented in shallow wells. It is found that the orientation of the fast S‐wave direction remains relatively constant for all stations over time, but the magnitude of the anisotropy, as measured by the delay time between the fast and slow S wave, exhibits significant local variations. Some stations experience a systematic increase or decrease in the delay time, with a spatial coherence about the injection well. The stress changes due to hydraulic fracturing, aseismic slip, and observed earthquakes are modeled to determine the best fit to the observed anisotropy changes. Our analysis indicates that the creation of a network of tensile hydraulic fractures during fluid injection is likely to be the cause of the observed anisotropy changes. This study confirms that the measurements of seismic anisotropy over time reflects the evolving stress state of a fault prior to and during rupture.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

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