Application of TE and TM polarization modes of audio magnetotelluric sounding method to geothermal exploration in bedrock mountainous areas
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摘要: 在不同静态效应下,音频大地电磁法(Audio Magnetotelluric sounding,AMT) TE极化模式和TM极化模式视电阻率曲线具有不同特征。理论模型正演结果表明:TM极化模式受地形起伏影响相对较大;TE极化模式受地形起伏影响相对较小,在识别山区构造方面更具优势。实际应用案例中,通过对比同一剖面TE极化模式和TM极化模式的反演结果,结合地质与钻孔资料,发现TE极化模式与钻孔资料吻合较好,在识别山区构造带富水低阻异常方面异常清晰,效果显著。Abstract: The resistivity curves of TE and TM polarization modes of audio magnetotelluric method (AMT) have respective characteristics under different static effects. Theoretical forward modelling results show that TM polarization model is relatively strong influenced by topography, while TE polarization model is weakly affected, which is more advantageous in identifying mountain structures. In the practical application, it is found that TE polarization mode is in good agreement with the drilling data by comparing the inversion results of two polarization modes in the same cross-section, which is very clear and effective in identifying the low resistivity anomalies of water-rich areas in mountain tectonic belt.
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