| ZTEM二维非线性共轭梯度反演研究 |
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| 引用本文： | 许智博,谭捍东.ZTEM二维非线性共轭梯度反演研究[J].物探与化探,2019(2):393-400. |
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| 作者姓名： | 许智博 谭捍东 |
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| 作者单位： | 北华大学土木与交通学院;中国地质大学(北京)地球物理与信息技术学院 |
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| 基金项目： | 国家重点研发计划课题"综合航空地球物理数据处理;解释和管理软件平台研发"(2017YFC0602204);国家自然科学基金(41830429)联合资助 |
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| 摘 要： | ZTEM(Z轴倾子电磁法)是一种天然场源的频率域航空电磁法,其特点是磁场垂直分量在空中机载平台测量,磁场水平分量在地面的固定基站测量,具有勘探深度大、速度快、成本低、覆盖面积大等技术优势。本文实现了ZTEM二维有限差分正演和二维非线性共轭梯度(NLCG)反演算法。研究对象是倾子资料,反演过程中通过解"拟正演"问题来避开雅克比矩阵的直接计算。通过理论模型合成数据反演试算,验证了ZTEM倾子资料二维NLCG反演算法的稳定性与可靠性。与大地电磁(MT) TE模式阻抗资料反演结果进行对比,发现在异常体横向边界的约束方面,ZTEM倾子反演比MT阻抗反演更具优越性。
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| 关 键 词： | ZTEM 倾子 航空电磁法 二维反演 非线性共轭梯度法 |
Two-dimensional nonlinear conjugate gradient inversion of ZTEM |
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| XU Zhi-Bo,TAN Han-Dong.Two-dimensional nonlinear conjugate gradient inversion of ZTEM[J].Geophysical and Geochemical Exploration,2019(2):393-400. |
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| Authors: | XU Zhi-Bo TAN Han-Dong |
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| Institution: | (Civil and Transportation College of Beihua University, Jilin 132013, China;School of Geophysics and Information Technology, China University of Geoscience (Beijing), Beijing 100083, China)) |
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| Abstract: | The ZTEM( Z-Axis Tipper Electromagnetics) is a frequency-domain airborne electromagnetic method that results from natural sources. It has the feature that the vertical component of magnetic field is measured from a moving helicopter platform and the horizontal component of magnetic field is measured at a reference station on the ground. In addition,it has the advantages of deep exploration,fast speed,low cost and large coverage area. This paper realizes the 2 D finite difference forward modeling and NLCG inversion of ZTEM. The object of the study is the tipper data. The direct calculation of Jacobian matrix is avoided by solving the " quasi-forward" problem in the inversion process. The stability and reliability of the 2D NLCG inversion of ZTEM tipper data are verified by the trial calculation of synthetic data inversion of theoretical model. A comparison with the inversion result of impedance data of magnetotelluric( MT) TE mode shows that the ZTEM tipper inversion is superior to the MT impedance inversion in the constraint of the lateral boundary of the anomalous body. |
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| Keywords: | Z-Axis Tipper Electromagnetics tipper airborne electromagnetic survey 2D inversion NLCG |
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