从瞬变电磁电性剖面到拟地震剖面的转换
|
摘要
为实现瞬变电磁测深资料的精细解释,本文提出了回线源瞬变电磁拟地震剖面转换的思路。给出水平层状介质下的转换模型,并提出了转换方法及转换步骤;直接由野外实测的二次感应电压数据,经过傅氏交换,在频率域利用线性数字滤波求出地面波阻抗;再经过反傅氏变换,在时间域利用线性规划法求取瞬变电磁场反射系数序列q_m;最终以q_m为参数绘制拟地震剖面。结果表明该方法效果明显。
In order to realize accurate interpretation of TEM sounding data, the idea of pseudo-seismic section transformation for TEM data produced by loop-source had been presented in the paper. The mathematical model was given in a condition of horizontal layered medium, the transform method and processing procedure have been put forward the secondary induced voltage data measured in field,after Fourier transform,was used to compute the wave-impedance by using linear numeric filtering in frequency domain;then after inverse Fourier transform,the reflection coefficient sequence qm of TEM field has been computed by linear programming in time-domain, and finally the pseudo-seismic section has been plotted by parameter qm. The results showed that the method is effective .
In order to realize accurate interpretation of TEM sounding data, the idea of pseudo-seismic section transformation for TEM data produced by loop-source had been presented in the paper. The mathematical model was given in a condition of horizontal layered medium, the transform method and processing procedure have been put forward the secondary induced voltage data measured in field,after Fourier transform,was used to compute the wave-impedance by using linear numeric filtering in frequency domain;then after inverse Fourier transform,the reflection coefficient sequence qm of TEM field has been computed by linear programming in time-domain, and finally the pseudo-seismic section has been plotted by parameter qm. The results showed that the method is effective .
引文
[1] 王家映.大地电磁拟地震解释法.北京:石油工业出版社,1995
[2] 李貅.瞬变电磁测深的理论与应用.西安:陕西科学技术出版社,2002,102～105
[3] 李貅,郭文波,胡建平.瞬变电磁测深快速拟地震解释方法及应用效果.西安工程学院学报,2001,23(9)
[4] Gershenson. Simple interpretation of time domain ele-ctromagnetic sounding using similarities between wave and diffusion propagation. Geophysics, 1997, 62 (3)
[5] 陈本池,周凤桐,李金铭.瞬变电磁场的波场变换研究.物探与化探,1999,23(3)
[6] 方文藻,李予国,李貅.瞬变电磁测深法原理.西安:西北工业大学出版社,1993
[7] 薛国强.瞬变电磁法成像技术研究.西安:长安大学地测学院,2002
[8] 考夫曼A A,凯勒G V著,王建谋译.频率域和时间域电磁测深.北京:地质出版社,1990
[9] 朴化荣.电磁测深法原理.北京:地质出版社,1990
[2] 李貅.瞬变电磁测深的理论与应用.西安:陕西科学技术出版社,2002,102～105
[3] 李貅,郭文波,胡建平.瞬变电磁测深快速拟地震解释方法及应用效果.西安工程学院学报,2001,23(9)
[4] Gershenson. Simple interpretation of time domain ele-ctromagnetic sounding using similarities between wave and diffusion propagation. Geophysics, 1997, 62 (3)
[5] 陈本池,周凤桐,李金铭.瞬变电磁场的波场变换研究.物探与化探,1999,23(3)
[6] 方文藻,李予国,李貅.瞬变电磁测深法原理.西安:西北工业大学出版社,1993
[7] 薛国强.瞬变电磁法成像技术研究.西安:长安大学地测学院,2002
[8] 考夫曼A A,凯勒G V著,王建谋译.频率域和时间域电磁测深.北京:地质出版社,1990
[9] 朴化荣.电磁测深法原理.北京:地质出版社,1990
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心