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基于张量格林函数的体积分方程法对三维异常体进行瞬变电磁响应的正演模拟，首先在频率域内计算电磁场分量的频率域响应， 然后利用快速数字滤波技术将计算结果转换到时间域。通过对水平电偶极子源激发下５ 层地层模型中同一深度上２ 个和３ 个远源的水平导电薄板的瞬变电磁场响应的计算， 发现在长偏移距瞬变电磁测深中， 近源异常体总是比远源异常体表现出更大的异常， 因此远源异常体在勘探中容易被忽略或漏掉， 这是一个在资料采集和解释中需要注意的问题。
Based on the volumetric equation method of tensor Green’s function, the three-dimensional anomalous body is simulated by forward electromagnetic transient response. Firstly, the frequency domain response of the electromagnetic field component is calculated in the frequency domain, then the fast digital filtering technique is used to convert the calculated result to the time domain. Through the calculation of the transient electromagnetic field response of two and three far-level horizontal conductive plates at the same depth in the five-layer stratum excited by the horizontal electric dipole source, it is found that in the long-distance electromagnetic transient sounding, The near-anomalous bodies always show larger anomalies than the distant-anomalous bodies, so the far-anomalous bodies can easily be overlooked or missed in the exploration. This is a problem that needs attention in data collection and interpretation.