1887

Abstract

Summary

Traditional forward modeling methods based on structured grids for Controlled-source Audio-frequency Magnetotelluric method (CSAMT) have been well developed. However, these methods have proved not to be effective for the complex topographic earth model as they have to approach the topography using stairs. In this paper, we present a finite-element method based on unstructured grids for CSAMT modeling. The finite-element method can effectively simulate the EM response for complex underground structures, while the unstructured grids can well approach the topographic earth surface. The accuracy check against other results shows that our method has a high accuracy. To analyses the characteristic of the topography effect on the CSAMT responses, we calculate the apparent resistivity for both 3D hill and valley models with and without abnormal bodies embedded.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201601095
2016-05-31
2020-05-31
Loading full text...

Full text loading...

References

  1. Jahandari, H. and Farquhason, C.G.
    [2014] A finite-volume solution to the geophysical electromagnetic forward problem using unstructured grids. Geophysics, 79, E287–E302.
    [Google Scholar]
  2. Matsuhata, Y.
    [2000] 2D electromagnetic modelling by finite-element method with a dipole source and topography. Geophysics, 65, 465–475.
    [Google Scholar]
  3. Newman, G.A. and Alumbaugh, D.L.
    [1995] Frequency-domain modelling of airborne electromagnetic responses using staggered finite differences. Geophysical Prospecting, 43, 1021–1042.
    [Google Scholar]
  4. Oldenburg, D.W., Haber, E. and Shekhtman, R.
    [2013] Three dimensional inversion of multisource time domain electromagnetic data. Geophysics, 78, E47–E57.
    [Google Scholar]
  5. Ren, Z., Kalscheuer, T., Greenhalgh, S. and Maurer, H.
    [2013] A goal-oriented adaptive finite-element approach for plane wave 3D electromagnetic modelling. Geophys. J. Int., 187, 63–74.
    [Google Scholar]
  6. Silva, N.J., Morgan, J.V., MacGregor, L. et al.
    [2012] A finite element multifrontal method for 3D CSEM modelling in the frequency domain. Geophysics, 77, E101–E115.
    [Google Scholar]
  7. Streich, R.
    [2009] 3D finite-difference frequency-domain modelling of controlled-source electromagnetic data: Direct solution and optimization for high accuracy. Geophysics, 74, F95–F105.
    [Google Scholar]
  8. Zhdanov, M.S., Lee, S.K. and Yoshioka, K.
    [2006] Integral equation method for 3D modelling of electromagnetic fields in complex structures with inhomogeneous background conductivity. Geophysics, 71, G333–G345.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201601095
Loading
/content/papers/10.3997/2214-4609.201601095
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error