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首页> 外文会议>Geophysical Solutions for Environment and Engineering vol.1 >Detection of subsurface geological anomalies using cross-hole electromagnetic computerized tomography
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Detection of subsurface geological anomalies using cross-hole electromagnetic computerized tomography

机译：使用跨孔电磁计算机断层扫描技术探测地下地质异常

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Cross-hole electromagnetic computerized tomography (CT) based on electromagnetic field attenuation and ray theory has been used to detect subsurface geological anomalies among the five boreholes at Shuibuya hydropower project. We adopt symmetrical dipole antenna to transmit electromagnetic waves in one borehole; use flagelliform antenna to receive field intensity in another borehole; apply inversion algorithm named simultaneous iterative reconstruction technique (SIRT), which is characterized by good convergence and fast iterative speed, to reconstruct attenuation coefficient distribution. Combining with the results of the boreholes and acoustic logging data, we deduce precisely the size, shape and spatial distribution of karst, cavities, corrosion fragmentation and rock cranny zones among the five boreholes. Results show that electromagnetic CT is of particular superiority in detecting underground geological anomalies, especially in carbonate or limestone area.
机译：基于水电磁场衰减和射线理论的跨孔电磁计算机断层扫描技术已经被用来探测水布ya水电站五个钻孔中的地下地质异常。我们采用对称偶极天线在一个井眼中传输电磁波。使用鞭毛状天线接收另一个井眼中的场强；应用具有良好收敛性和迭代速度快的特点的同时迭代重构技术（SIRT）反演算法来重构衰减系数分布。结合钻孔结果和声波测井数据，我们可以精确地推算出五个钻孔之间的岩溶，空腔，腐蚀碎屑和岩石裂缝区域的大小，形状和空间分布。结果表明，电磁CT在探测地下地质异常方面尤其具有优势，特别是在碳酸盐或石灰岩地区。

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