| A new method of migration imaging for MT data |
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| 作者姓名： | 宋维琪 邹文勇 |
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| 作者单位： | Earth Resources and Information Institute，University of Petroleum，Geoscience Research Institute of Shengli Oil field，China Petroleum Chemical Corporation Dongying 257061，China，Dongying 255075，China |
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| 摘 要： | Introduction The migrationof electromagnetic field is like that of elastic wave in seismic prospecting, butthere are some differences between them (Lee et al, 1989). The elastic wave field satisfies thegeneral wave equation, while the electromagnetic field in our study satisfies the diffusion equation.Both the electromagnetic field and the elastic wave field have a similar mechanism. The imagingfunction named map can characterize the interface of different mediums (MA, 1989), that is …
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| 收稿时间： | 13 February 2003 |
| 修稿时间： | 26 July 2004 |
A new method of migration imaging for MT data |
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| Song Wei-qi,and Zou Wen-young.A new method of migration imaging for MT data[J].Acta Seismologica Sinica(English Edition),2005,18(1):106-112. |
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| Authors: | Song Wei-qi and Zou Wen-young |
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| Institution: | 1. Earth Resources and Information Institute, University of Petroleum, Dongying 257061, China
2. Geoscience Research Institute of Shengli Oil field, China Petroleum Chemical Corporation, Dongying 255075, China |
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| 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 equa- tion 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 men- tioned above, better results are obtained by the new method, which has been verified by both the theory model and practical data. |
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| Keywords: | MT data method improvement numerical calculation migration and imaging |
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