Two dimensional inversion of magnetic anomaly and its application to undulating terrain
KUANG Xing-Tao1, WU Jian-Sheng2, YANG Hai1, ZHENG Guang-Ru1, ZHU Xiao-Ying1
1. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China;
2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
Topography has a great influence on the inversion and interpretation of magnetic anomaly, especially where the abnormal body is distributed close to the ground.In order to reduce this influence, the authors deduced limited-deep two-dimensional thick plate forward formula under the rugged topography, and put forward a new method to divide the underground objects under the rugged topography.In addition, focusing inversion has good focusing effect for physical property;if we can predict that the magnetic anomaly is caused by ferromagnetic body, then focusing inversion can be applied to obtain better situation.It is obvious that this method is suitable for the inversion of ferromagnetic body.The authors combined two-dimensional magnetic anomaly forwarding and focusing inversion under the rugged topography, and carried out corresponding model test, then compared this method with focusing inversion under the flat topography with max smoothness inversion under the rugged topography, and the results show the effectiveness of the method put forward by the authors.Finally, the authors applied the method to magnetic anomaly profile obtained from Tex, Xinjiang, and made a reasonable explanation for the ferromagnetic body.
匡星涛, 吴健生, 杨海, 郑广如, 朱晓颖. 起伏地形条件下的磁异常二维聚焦反演及应用[J]. 物探与化探, 2016, 40(4): 788-797.
KUANG Xing-Tao, WU Jian-Sheng, YANG Hai, ZHENG Guang-Ru, ZHU Xiao-Ying. Two dimensional inversion of magnetic anomaly and its application to undulating terrain. Geophysical and Geochemical Exploration, 2016, 40(4): 788-797.
[1] 刘沈衡.磁性起伏地形磁异常改正方法探讨[J].地质学刊,2011,35(3):302-306.
[2] 眭素文,于长春,姚长利.起伏地形剖面重磁异常半智能处理解释软件及应用[J].物探与化探,2004,28(1):65-68.
[3] 安玉林.起伏地形上规则二度体复重磁场正演和直接反演[J].物探与化探,2003,27(4):284-291.
[4] Last B J,Kubik K.Compact gravity inversion[J].Geophysics,1983,48(6):713-721.
[5] Barbosa V C F,Silva J B C.Generalized Compact gravity inversion[J].Geophysics,1994,59(1):57-68.
[6] Pilkingtong M.3-D magnetic imaging using conjugate gradient[J].Geophysics,1997,62(4):1132-1142.
[7] Li Y G,Oldenburg D W.3-D inversion of gravity data[J]. Geophysics,1998,63(1):109-119.
[8] Li Y G,Oldenburg D W.3-D inversion of magnetic data[J].Geophysics,1996,61(2):394-408.
[9] Li Y G.3-D Inversion of gravity gradiometerdata[J].Seg Expanded Abstracts,1949(1):1470.
[10] Rudin L I,Osher S,Fatemi E. Nonlinear total variationbased noise removal algorithm[J].Physica D,1992,60:259-268.
[11] Acar R,Vogel C R.Analysis of total variation penaltymethods[J].Inverse problems,1994,10:1217-1229.
[12] Portniaguine O,Zhdanov M S.Focusing geophysical inversion images[J].Geophysics,1999,64(3):874-887.
[13] Oleg Portniaguine,Michael S.Zhdanov.3-D magnetic inversion with data compressionandimage focusing[J].Geophysics,2002,67(5):1532-1541.
[14] Zhdanov M S,Ellis R,Mukherjee S.Three-dimensional regularized focusing inversion of gravitygradient tensor component data.Geophysics,2004,69(4):925-937.
[15] 吴健生,刘苗.基于小波的位场数据融合[J].同济大学学报:自然科学版,2008,36(8).
[16] 杨文采,施志群,侯尊泽,等. 离散小波变换与重力异常多重分解[J].地球物理学报,2001,44(4):534-541.
[17] 管志宁.地磁场与磁力勘探[M].北京:地质出版社,2005.
[18] 郑广如,张玄杰,范子梁.新疆西天山特克斯-霍拉山地区1:5万航磁勘查成果报告[R].中国国土资源航空物探遥感中心,2012.