Interpretation research on electrical source of time domain ground-airborne electromagnetic data
Interpretation research on electrical source of time domain ground-airborne electromagnetic data
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发表时间：
2012-06
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通讯作者：
Jia Yanju;Yang Guihong;G. Shanshan;Zhang Xiaoshuang;Tian Peipei
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作者：
Jia Yanju;Yang Guihong;G. Shanshan;Zhang Xiaoshuang;Tian Peipei
针对地-空电磁资料中长线源的解释问题，提出了一种将长线源分裂成若干电偶极子的方法。讨论了不同接收高度对电磁响应的影响。这导致当接收高度小于30 m时，经模型计算，地面接收到的响应与空中接收到的响应相当。根据上述结论和计算方法，采用全时视电阻率算法和典型三层模型的理论数据进行反演，验证了该方法的有效性。结果表明，在接收高度为30 m的条件下，当源-接收器距离小于100 m时，误差小于10%，而在其它情况下，误差小于5%。
To solve problems concerning interpretation of the long wire source of ground-airborne electromagnetic data, this article brings forward a method by splitting the long wire source into numbers of electric dipoles. It also discusses how different receiving heights influence electromagnetic response. That leads to when the receiving height is less than 30m; the response received on the ground is equivalent to the response received in the air after model calculation. According to conclusions and calculation method mentioned above, an algorithm with all time apparent resistivity and theoretical data forwarded from typical 3-layer model was used to test the validity of this method conversely. Under a specified condition of the receiving height of 30m, the results show that, if the source-receiver distance is less than 100m, the error is less than 10%, while in other cases, the error is within 5%.