Pseudo‐seismic wavelet transformation of transient electromagnetic response in engineering geology exploration
Pseudo‐seismic wavelet transformation of transient electromagnetic response in engineering geology exploration
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DOI：
10.1029/2007gl031116
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发表时间：
2007-08
影响因子：
5.2
通讯作者：
G. Xue;Y. Yan;X. Li
中科院分区：
文献类型：
--
作者：
G. Xue;Y. Yan;X. Li
本文对工程地质勘探中将瞬变电磁扩散场响应转换为拟地震子波进行了新的理论分析和数值模拟。它可以清楚地揭示地下的电界面。为了简化积分方程，将积分范围分成7个窗口，每个窗口编译成一组积分系数。然后，对系数的精度进行了检验，并利用计算出的系数，通过优化方法得到了拟地震子波。最后，设计了几个地电模型，将模型响应转换为拟地震子波。变换后的虚波表明，当波遇到电性界面时，会出现反射和折射现象。这一结果为在瞬变电磁法资料处理中引入地震解释提供了依据。
This paper presents some new theoretical analysis and numerical simulations of that transient electromagnetic diffusion‐field response is transformed into a pseudo‐seismic wavelet in engineering geology exploration. It can clearly reveal the electric interface under ground. To simplify the integral equation used in the transformation, the integral range is separated into seven windows, and each window is compiled into a group of integral coefficients. Then, the accuracy of the coefficients is tested, and the calculated coefficients are used to derive the pseudo‐seismic wavelet by optimization method. Finally, several geo‐electric models are designed, so that model responses are transformed into the pseudo‐seismic wavelet. The transformed imaginary wave shows that some reflection and refraction phenomena appear when the wave meets the electric interface. This result supports the introduction of the seismic interpretation in data processing of transient electromagnetic method.