| 大地电磁与地震反射波走时数据二维联合反演 |
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| 引用本文： | 陈霜,谭捍东,高敬语.大地电磁与地震反射波走时数据二维联合反演[J].现代地质,2016,30(3):597-605. |
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| 作者姓名： | 陈霜 谭捍东 高敬语 |
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| 作者单位： | (1. 核工业二〇八大队，内蒙古 包头 014010；2. 中国地质大学(北京) 地球物理与信息技术学院，北京 100083) |
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| 基金项目： | 国家自然科学基金项目(41374078)；国土资源部地质调查项目(12120113086100,12120113101300)。 |
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| 摘 要： | 由于地球物理反演存在固有的多解性问题，如何减小多解性，提高地球物理方法反演结果的可靠性和准确性是当今地球物理领域研究的热点。为了减小大地电磁与地震反射波走时资料反演的多解性，在Gallardo和Meju研究的交叉梯度理论的基础上，实现大地电磁与地震反射波走时数据的二维联合反演算法；设计理论地电模型和速度模型进行合成数据的单独反演和联合反演试算，并验证大地电磁和地震反射波走时数据二维联合反演算法的正确性和有效性。反演结果表明，利用交叉梯度方法耦合大地电磁电阻率参数和地震波速度参数能使联合反演过程中的这两个模型在更新的时候相互约束，联合反演结果比单一反演结果更接近真实模型，从而使反演结果更可靠，减少了反演解的多解性。
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| 关 键 词： | 大地电磁法 地震反射走时 交叉梯度 二维联合反演 |
Two-dimension Joint Inversion of Magnetotelluric and Seismic Reflection Travel Time Data |
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| Institution: | (1. Geological Exploration Party No.208, CNNC, Baotou, Inner Mongolia 014010, China; 2. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China) |
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| Abstract: | Because of the problem of multiple solutions for geophysical inversion, how to reduce the multiple solutions to improve the reliability and accuracy of the results of geophysical inversion is a hot geophysical research topic today. To reduce the multiple solutions of magnetotelluric and seismic data inversion, this study develops a 2-D joint inversion algorithm of magnetotelluric data and seismic data on the base of cross-gradient theory which is proposed by Gallardo and Meju, and the theoretical geoelectric model and velocity model are designed for single inversion and joint inversion, then the 2-D joint inversion algorithm of magnetotelluric and seismic data is verified to be correct and valid. The inversion results show that the above inversion algorithm with cross-gradient constraints can cause the resistivity model and velocity model constrain each other so that the joint inversion result is closer to the reality than the single inversion result. Therefore, the joint inversion is more reliable, which can reduce the multiple solution of geophysical inversion. |
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| Keywords: | magnetotelluric method seismic reflection travel time cross-gradient method 2-D joint inversion |
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