不同观测参数条件下中心回线瞬变响应特征分析

本文采用正演模拟的方法，分析不同观测参数条件下低阻目标层及高阻目标层半空间两种典型地电断面上瞬变响应曲线特征。分析结果表明：低阻层在晚期的相对异常为正，在早期的相对异常为负；高阻层的异常特征与之相反。位于晚期的目标层相对异常大于位于早期目标层相对异常，并且受关断时间的影响也较小。在选择观测线圈大小时，应在能保证观测到足够强度信号的情况下，选用半径较小的线圈，以便将异常落在晚期。

Analyzing transient response of central loop under different conditions of observing parameters

The paper used forward simulation approach to analyze the curve characters of transient half space response in two typical geoelectric sections of low resistivity zone and high resistivity zone under different condition of observing parameters. The analyzed results showed the relative anomaly at later stage is positive and negative at earlier stage for low resistivity zone and anomalous characters of high resistivity zone are opposite. The relative anomaly of target at later stage is bigger than that at earlier stage, and less affected by cut-out time. When choosing the size of surveying coil, it should select smaller radius coil while guaranteeing to survey enough strong signal, which allows the anomaly to be at later stage.