| 大地电磁测深资料的联合反演研究 |
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| 引用本文： | 林长佑,武玉霞.大地电磁测深资料的联合反演研究[J].西北地震学报,1991,13(2):8-21. |
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| 作者姓名： | 林长佑 武玉霞 |
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| 作者单位： | 国家地震局兰州地震研究所
(林长佑)，国家地震局兰州地震研究所(武玉霞) |
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| 基金项目： | 地震科学联合基金(89准字第121号) |
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| 摘 要： | 本文从大地电磁扬的色散关系出发,阐述了进行大地电磁资料一维联合反演的物理意义。论证了对于以色散关系相联系的一对大地电磁响应函数,特别是阻抗实部和虚部视电阻率进行联合反演的必要性和可能的应用前景。对比研究了大地电磁阻抗各单参量及其联合反演的效果。结果表明,在加快反演迭代速度,限定反演解的非唯一性、保证反演迭代的稳定进行等方面,联合反演比单参量反演具有明显的优越性;在大多数情况下,阻抗实部视电阻率和阻抗虚部视电阻率联合反演的效果要比通常所采用的常规视电阻率和阻抗相位的联合反演效果好。实际大地电磁资料的试验表明,各种不同平均阻抗的利用和综合反演解释将有助于获得更为可靠的结果。
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| 关 键 词： | 大地电磁 水深测量 地震勘探 |
| 收稿时间： | 1990/12/25 0:00:00 |
ON THE JOINT INVERSION OF MAGNETOTELLURIC DATA |
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| Lin Changyou and Wu Yuxia.ON THE JOINT INVERSION OF MAGNETOTELLURIC DATA[J].Northwestern Seismological Journal,1991,13(2):8-21. |
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| Authors: | Lin Changyou and Wu Yuxia |
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| Institution: | Earthquake Research Institute of Lanzhou, SSB, China and Earthquake Research Institute of Lanzhou, SSB, China |
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| Abstract: | On the basis of dispersion relations for the magnetotelluric (MT) field,the physical meanings of 1-D joint inversion of MT data are expounded.The necessity and applied prospects of the joint inversion using a pair of MT response functions,especially the apparent resistivities of the impedance''s real and imaginary parts,which are relative with the dispersion relations,are inferred.The effects of the single parameter''s and joint inversions for MT impedance are tested.It is shown that in the aspects of increasing the velocity of the inverse iteration,limiting the non-uniqueness of the inverse solution and assuring the stable convergence of the inverse iteratinn,the joint inversions are more advahtageous than the single-parameter''s inversions,in the most cases the joint inversion using the apparent resistivities of impedance''s real and imaginary parts is more advantageous than the joint inversion using the normal apparent resistivity and impedance''s phase,which is usually used now.The test for practical MT data shows that the use of the various average impedances and the synthetic interpretation of them will help to obtain more reliable results. |
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