论文部分内容阅读
瞬变电磁(TEM)视电阻率早、晚期计算公式在求取时进行了简化近似,造成部分地电信息的失真.瞬变电磁响应信号衰减过程与介质的电性特征有关,由此引入瞬变电磁响应微分衰减速度和二阶微分衰减速度两个解释参数,力图避开视电阻率计算,以衰减速度表示瞬变电磁探测结果的电性特征.首先研究了不同导电均匀半空间与低阻目标体地电模型瞬变电磁响应微分衰减速度在时间上的变化特征,在此基础上对瞬变电磁响应二阶微分衰减速度进行了分析,通过绘制TEM二阶微分衰减拟断面图实现了低阻目标体地电模型的电性层划分.研究结果表明:电性分界面与二阶微分衰减的“0”等值线相对应,可以用“0”值等值线作为电性分界面的划分依据,即瞬变电磁微分解释方法能够区分不同地电断面,可以用于瞬变电磁探测成果解释.
Transient electromagnetic (TEM) apparent resistivity of early and late formulas obtained when the simplified approximation, resulting in part of the geoelectric information distortion. Transient electro-magnetic response signal attenuation process and the dielectric properties of the dielectric, which introduced the instant The electromagnetic response of the differential decay rate and the second order differential decay rate of interpretation of two parameters, trying to avoid the apparent resistivity calculation, the decay rate of the transient electromagnetic detection results of the electrical characteristics.First of all, different conductive half-space and low resistance Based on this, the second-order differential decay speed of transient electromagnetic response is analyzed. By drawing the second-order differential attenuation diagram of TEM, the effects of low The results show that the electrical interface corresponds to the “0 ” contours of the second order differential decay, and the “0 ” contours can be used as the electrical contours The basis of the division of sexual interface, that is, the method of transient electromagnetic differential interpretation can distinguish different sections of the earth and can be used to explain the results of transient electromagnetic detection.