Evaluation of Subsurface Structure at Soultz Hot Dry Rock Site by the AE Reflection Method in Time-frequency Domain
Evaluation of Subsurface Structure at Soultz Hot Dry Rock Site by the AE Reflection Method in Time-frequency Domain
复制标题
时频域AE反射法评价Soultz干热岩场地地下结构
DOI：
10.1007/pl00001264
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发表时间：
2002
影响因子：
2
通讯作者：
R. Baria
中科院分区：
文献类型：
--
作者：
N. Soma;H. Niitsuma;R. Baria
由于法国苏尔茨干热岩 (HDR) 场地将扩大为更深层次的科学试验工厂，因此对预先开发的人工水库下方深层区域的测量变得越来越重要。在本文中，我们提出了对 Soultz HDR 站点深层地下结构的估计，该估计是通过使用声发射 (AE) 信号（即诱发地震活动）作为波源的反射方法获得的。首先，我们简要描述利用小波变换在时频域中的AE反射方法。然后，我们利用 1993 年观测到的 101 个高能 AE 事件对地下结构进行了估计。我们对两口井中使用 AE 反射方法与其他独立钻孔观测结果进行了比较和讨论。此外，我们还提出了通过均线图线性识别的反射器频率依赖性的调查结果，作为进一步表征检测到的结构的可能手段。
Because the Soultz Hot Dry Rock (HDR) site, France, is to be expanded to a scientific pilot plant of greater depth, measurement of the deep area below the predeveloped artificial reservoir is gaining importance. In this paper, we present estimates of deep subsurface structure at the Soultz HDR site, obtained by a reflection method using acoustic emission (AE) signals, that is, induced seismicity, as the wave source. First, we briefly describe the AE reflection method in the time-frequency domain with wavelet transform. Then we show estimates of the subsurface structure by using 101 high-energy AE events observed in 1993. We compare and discuss the results obtained, using the AE reflection method in two wells with other independent borehole observations. Furthermore, we present the results of an investigation of the frequency dependence of reflectors identified by hodogram linearity as a possible means of further characterizing detected structures.