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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >Virtual Seismometers in Geothermal Systems: Using Microquakes to Illuminate the Subsurface
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Virtual Seismometers in Geothermal Systems: Using Microquakes to Illuminate the Subsurface

机译：地热系统中的虚拟地震仪：使用微型品照亮地下

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A natural response to fluid injection at enhanced geothermal sites is the creation of microseismicity. Thousands of microquakes are often associated with an injection well. When processed using novel geophysical techniques, these microquakes effectively illuminate the subsurface, and can be used to monitor plume growth and identify otherwise hidden structures. The virtual seismometer method (VSM) is a new technique of seismic interferometry that provides precise estimates of the GF between earthquakes. It is very sensitive to the source parameters (location, mechanism and magnitude) and to the Earth structure in the source region. Using VSM, we are able to focus sharply on the cloud of microseismicity. We can monitor the evolution of seismicity over time, measure changes in the style of faulting and sort microseisms by location and magnitude. Our ultimate intent is to use it to image structures within the microseismic cloud in an attempt to identify previously un-observed fault zones. In simple terms VSM involves correlating the waveforms from a pair of events recorded at an individual station and then stacking the results over all stations to obtain the final result. In the far-field, when most of the stations in a network fall along a line between the two events, the result is an estimate of the GF between the two, modified by the source terms. In this geometry each earthquake is effectively a virtual seismometer recording all the others. When applied to microquakes, this alignment is often not met, and we need to address the effects of the geometry between the two microquakes relative to each seismometer. Nonetheless, the technique is quite robust, and highly sensitive to the microseismic cloud.
机译：在增强型地热站点的流体注入的一种自然反应是微震的创建。成千上万的微震的往往是与注射有关好。当使用新型的地球物理技术进行处理，这些微震有效地照亮地下，并且可以用于监测羽生长和鉴定否则隐藏结构。虚拟地震检波方法（VSM）是地震干涉测量法，其提供地震之间的GF的精确估计的一种新技术。它是将源参数（位置，机构和大小）和地球结构在源极区域非常敏感。使用VSM，我们能够大幅专注于微震云。我们可以监测地震活动随时间的变化，通过测量位置和大小在断层和排序微震的风格变化。我们的最终目的是微震云中使用它来形象结构，试图找出以前未观测到的断裂带。简单来说VSM涉及的波形从一对记录在个人站的事件的关联，然后堆叠在结果的所有站，以获得最终结果。在远场，当大多数在沿两个事件之间的线的网络落入站的，结果是两者之间的GF的估计，由所述源项修改。在这种几何每次地震实际上是一个虚拟的地震仪记录的所有其他人。当应用于微震，这种取向往往得不到满足，我们需要解决相对于每一个地震检波两个微震之间的几何形状的影响。尽管如此，该技术是相当强劲，并微震云高度敏感。

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