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针对瞬变电磁圆锥型场源装置,采用汉克尔变换和余弦变换数值滤波法对该场源和中心回线源瞬变电磁正演响应进行了计算.将“烟圈”反演结果转换到频率域作为初始模型,采用最小二乘正则化方法对反演结果进行了改进.以电阻率100Ω·m的均匀半空间模型对两种反演方法进行了验证,并在此基础上对2层、3层和4层典型地电模型开展了正反演计算.最后,在某矿集区开展了短剖面实验,并采用2种反演方法对实测数据进行了处理.研究结果表明:用最小二乘正则化方法改进后的反演电阻率更接近于模型电阻率,反演深度更接近层界面,具有一定的分层效果;其视电阻率拟合曲线与模型的重构误差在10-4~10-3范围内.对均匀介质模型开展的反演表明,改进后的反演电阻率与模型电阻率的相对误差约为0.2%,而“烟圈”反演的相对误差超过0.8%.
For the transient electromagnetic field source device, Hankel transform and cosine transform are used to calculate the transient electromagnetic forward response of the field source and the center return source. The “smoke ring” inversion result In this paper, the inversion results are improved by the method of least-squares regularization, and the two half-space models with a resistivity of 100 Ω · m are used to verify the two inversion methods. Based on this, Inverted inversion calculation is carried out on typical 2, 3, 4 layer electric model.Finally, a short section experiment is carried out in a mining area and the measured data are processed by two kinds of inversion methods.The results show that: The inversion resistivity improved by the least-squares regularization method is closer to the model resistivity and the inversion depth is closer to the interface of the layer, and has a certain stratification effect. The reconstruction error of the apparent resistivity fitting curve and the model is in the range of 10-4 ~ 10-3.The inversion of the uniform medium model shows that the relative error between the improved inversion resistivity and the model resistivity is about 0.2%, while the relative inversion of the “smoke ring” The error is more than 0.8%.