Abstract
Based on the study on electromagnetic field migration by Zhdanov, we have proposed an improved method for the weak points in the research. Firstly, the initial background resistivity should be determined by using 1-D inversion results. Then in the process of continuation, the results are corrected and calculated layer by layer by the iteration method, so that more exact resistivity can be obtained. Secondly, an improved algorithm for finite-difference equation is studied. According to the property of electromagnetic migration field, the algorithm is designed by means of grids varying with geometric progression in the longitudinal direction. Being improved by the techniques mentioned above, better results are obtained by the new method, which has been verified by both the theory model and practical data.
Similar content being viewed by others
References
CHEN Yue-shou, WANG Guang-e. 1990. Method of Magnetotelluric Sounding [M]. Peking: Geological Publishing House, 120–240 (in Chinese).
Lee S, Mcmechan G A, Aiken C L V. 1989. Phase imaging —equivalent algorithm of seismic migration in electromagnetic field [J]. Collected Translation of Petroleum Geophysical Exploration. (1): 56–60 (in Chinese).
MA Zai-tian. 1989. Technology of Seismic Imaging—Finite-difference Migration [M]. Peking: Petroleum Industry Publishing House. 35–90 (in Chinese).
PU Hua-rong. 1990. Theory of Electromagnetic Sounding [M]. Peking: Geological Publishing House. 23–123 (in Chinese).
Zhdanov M S, Traynin P, Booker J R 1996. Underground imaging by frequency-domain electromagnetic migration [J]. Geophysics, 61(3): 666–682.
Author information
Authors and Affiliations
About this article
Cite this article
Song, Wq., Zou, Wy. A new method of migration imaging for MT data. Acta Seimol. Sin. 18, 106–112 (2005). https://doi.org/10.1007/s11589-005-0012-1
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11589-005-0012-1