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在对浙江省某铜矿进行瞬变电磁勘查时,由于感应激发极化效应的影响,造成瞬变电磁晚期测道的数据发生倒转。采用常规的瞬变电磁数据处理方法难以处理,造成晚期测道数据不可用,影响TEM的探测深度及精度。针对这个情况,采用Cole.Cole模型分析了均匀半空问模型中直流电阻率、充电率、时间常数以及频率相关系数对磁性源瞬变电磁响应的影响规律。利用奇异值分解法(The Singular Value Decomposition,简称SVD)对实测TEM数据进行分析及反演,并且从瞬变电磁响应数据中分离出勘探区瞬变电磁测量数据Cole—Cole模型的各参数,将分离出来的参数用于探测结果的辅助解释。经过分析得出充电率和频率相关系数对瞬变电磁响应的影响较大,而直流电阻率和时间常数对其影响较小的结论。通过常规方法和奇异值分解法对实测数据分别进行处理,发现后者视电阻率断面图的异常更加突出,从而较准确的圈定了铜矿体地范围,此结论得到_『钻孔的验证,与实际地质情况吻合较好。
In a transient electromagnetic survey of a copper mine in Zhejiang Province, due to the influence of induced excitation polarization, the data of the transient electromagnetic late channel was reversed. The use of conventional transient electromagnetic data processing method is difficult to deal with, resulting in late track data is not available, affecting the detection depth and accuracy of TEM. In this case, Cole.Cole model was used to analyze the influence of DC resistivity, charge rate, time constant and frequency correlation coefficient on transient electromagnetic response of a magnetic source in a homogeneous semi-space model. The Singular Value Decomposition (SVD) is used to analyze and inverse the measured TEM data. The parameters of the Cole-Cole model of the transient electromagnetic data in the exploration area are separated from the transient electromagnetic response data. The parameters The separated parameters are used to interpret the results of the probing. After analysis, it is concluded that the correlation coefficient between charging rate and frequency has greater influence on the transient electromagnetic response, while the DC resistivity and the time constant have less influence on it. Through the conventional method and the singular value decomposition method to process the measured data respectively, it is found that the anomalous profile of the apparent resistivity of the latter is more prominent, so as to delineate the scope of the copper ore body more accurately. This conclusion has been verified by Drilling Hole, Good agreement with the actual geological conditions.