| MT法电磁相位移偏移研究 |
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| 引用本文： | 李吉松,朴化荣.MT法电磁相位移偏移研究[J].石油地球物理勘探,1994(2). |
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| 作者姓名： | 李吉松 朴化荣 |
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| 作者单位： | 长春地质学院地球物理系!130026(李吉松)，长春地质学院地球物理系(朴化荣) |
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| 摘 要： | 在地震勘探中，偏移是地震资料的主要处理方法之一。MT法中的平面电磁波与地震弹性波有本质的区别，但也有很多相似性。导电介质中的平面电磁波在介质的分界面上也发生反射与透射。利用平面电磁波的上行波场U和下行波场D在反射面上的相位关系特征，可把地震偏移技术中U／D成像理论引入到MT法数据处理中。相位移法原理简单、速度快，是一种理想的一维偏移方法，但在二维模型数据的偏移处理中还需要作适当的改进。PSPI（相位移加内插）法可以得到二维U／D成像的较好结果。
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| 关 键 词： | 大地电磁测深法 电磁波 相位移 偏移 |
Research on phase shift migration of magnetotelluric data |
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| Li Jiesong.Research on phase shift migration of magnetotelluric data[J].Oil Geophysical Prospecting,1994(2). |
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| Authors: | Li Jiesong |
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| Abstract: | Migration is one of the main methods for.seismic data processing. Plane electromagnetic wave in magnetotelluric sounding is essentially different from seismic elastic wave,but they do have some similarities. The plane electromagnetic wave in an electric medium also reflects and transmits on the interfaces. Upgoing/downgoing wave image theory in seismic migration can be introduced into magnetotelluric data processing in terms of the phase relation between upgoing and downgoing plane eletromagnetic waves on a reflection interface. Phase shift method is very suitable for 1-D data migration because of its simple principle and fast operation;however,it should be improved for 2-D data migration. Phase shift plus interpolation brings good image of 2-D upgoing and downgoing wave fields. |
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| Keywords: | magnetotelluric sounding electromagnetic wave phase shift migration |
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