期刊文献+

A three-dimensional transient electromagnetic data inversion method based on a time–frequency transformation 被引量:1

下载PDF
导出
摘要 Herein,a three-dimensional(3D)inversion method in the frequency domain based on a time–frequency transformation was developed to improve the efficiency of the 3D inversion of transient electromagnetic(TEM)data.The Fourier transform related to the electromagnetic response in the frequency and time domains becomes a sine or cosine transform under the excitation of downward-step current.We established a transformation matrix based on the digital fi ltering calculation for the sine transform,and then the frequency domain projection of the TEM data was determined from the linear transformation system using the smoothing constrained least squares inversion method,in which only the imaginary part was used to maintain the TEM data transformation equivalence in the bidirectional projection.Thus,the time-domain TEM inversion problem was indirectly and effectively solved in the frequency domain.In the 3D inversion of the transformed frequency-domain data,the limited-memory Broyden–Fletcher–Goldfarb–Shannoquasi–Newton(L-BFGS)method was used and modifi ed with a restart strategy to adjust the regularization parameter when the algorithm tended to a local minimum.Synthetic data tests showed that our domain transformation method can stably project the TEM data into the frequency domain with very high accuracy;furthe rmore,the 3D inversion of the transformed frequency-domain data is stable,can be used to recover the real resistivity model with an acceptable effi ciency.
出处 《Applied Geophysics》 SCIE CSCD 2020年第3期361-376,共16页 应用地球物理(英文版)
基金 the National Key Research and Development Program of China(No.2016YFC060110403).
  • 相关文献

参考文献5

二级参考文献16

  • 1黄力军,罗延钟.时间谱电阻率法可行性初探[J].地质科技情报,1995,14(2):98-105. 被引量:13
  • 2昌彦君,张桂青.电磁场从频率域转换到时间域的几种算法比较[J].物探化探计算技术,1995,17(3):25-29. 被引量:26
  • 3科恩L.时-频分析:理论与应用[M].西安:西安交通大学出版社,1998..
  • 4布赖姆EO 柳群(译).快速傅里叶变换[M].上海:上海科学技术出版社,1979..
  • 5陈明生 陈乐寿 王天生 等.用改进广义逆矩阵方法解释大地电磁测深及电测深资料.地球物理学报,1983,26(4):390-400.
  • 6Knight J G, Raiche A P. Transient electromagnetic calculation using the Gaver-Stenhfest inverse Laplace transform method. Geophysics, 1982, 47(1) : 47-50.
  • 7Gershenson M. Simple interpretation of time-domain electromagnetic sounding using similarities between wave and diffusion propagation.Geophysics, 1997, 62(3): 763-774.
  • 8Qian s, Chen D. Joint Time-Frequency Analysis. New York:Prentice-Hall, 1996. 109-132, 52 - 58.
  • 9Kaufman A A, Keller G V. Frequency and transient soundings.New York: Elsevier Science Publishers B V, 1983. 325.
  • 10朴化荣,电磁测深法原理,1991年,87页

共引文献48

同被引文献25

引证文献1

二级引证文献13

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部