吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 941-951.doi: 10.13278/j.cnki.jjuese.201503303
王卫平1, 曾昭发2, 李静2, 吴成平1
Wang Weiping1, Zeng Zhaofa2, Li Jing2, Wu Chengping1
摘要:
为了研究地形对频率域航空电磁法的影响程度,以及如何有效提取由于地形产生的航空电磁场,笔者利用频率域有限差分法开展了复杂地形条件下的频率域航空电磁响应计算和分析研究。计算结果表明,坡度较陡的地形对频率域航空电磁响应影响较大(尤其在沟谷位置地形影响最大),以至于增加了电磁异常的复杂程度,影响了电磁异常的解释结果。在综合研究的基础上,采用二维和三维的地形校正方法对典型地形地电模型进行校正,有效去除和压制了地形引起的电磁干扰异常,突出了异常体引起的电磁异常,提高了频率域航空电磁的解释效果。
中图分类号:
[1] Liu G, Becker A. Evaluation of Terrain Effects in Aem Surveys Using the Boundary Element Method[J]. Geophysics, 1992, 57: 272-278.[2] Newman G A, Alumbaugh D L. Frequency-Domain Modelling of Airborne Electromagnetic Responses Using Staggered Finite Differences[J]. Geophys Prosp, 1995, 43: 1021-1042.[3] Sasaki Yutaka,Nakazato Hiroomi.Topographic Effects in Frequency-Domain Helicopter-Borne Electromagne-tics[J]. Exploration Geophysics, 2003, 34, 24-28.[4] 阮百尧,徐世浙,戴世坤,等. 二维大地电磁测深曲线的快速反演[J]. 桂林工学院学报, 1998,18(1): 53-56. Ruan Baiyao, Xu Shizhe, Dai Shikun,et al. Rapid Inversion of 2D Magnetotelluric Sounding Date[J]. Journal of Guilin Institute of Technology, 1998,18(1): 53-56.[5] 徐世浙,于涛. 电导率分块连续变换的二维MT有限元模拟[J]. 高校地质学报,1995,2(2): 65-73. Xu Shizhe, Yu Tao. The Finite Element Method for Modeling 2-D MT Field on a Geoelectrical Model with Continuous Variation of Conductivity Within Each Block[J]. Geological Journal of China Universities, 1995,2(2): 65-73.[6] 徐世浙. 电导率分层连续变化的水平层的大地电磁正演[J]. 地球物理学报,1995,38(2): 262-268. Xu Shizhe. A Numerical Method for Calculating MT Field on a Layered Model with Continuous Change of Conductivity in Each Layer[J]. Chinese Journal of Geophysics, 1995, 38(2): 262-268.[7] 徐世浙, 阮百尧, 周辉,等. 用边界元法模拟三维地形对MT场的影响[J]. 科学通报, 1996,41(23): 2162-2164. Xu Shizhe,Ruan Baiyao,Zhou Hui,et al. Modeling 3-D Terrain Effect on MT by the Boundary Element Method[J]. Chinese Science Bulletin, 1996, 41(23): 2162-2164.[8] 徐世浙,阮百尧,周辉,等. 大地电磁场三维地形影响的数值模拟[J]. 中国科学:D辑:地球科学, 1997, 27(1): 15-20. Xu Shizhe, Ruan Baiyao, Zhou Hui, et al. The Electromagnetic Field Numerical Simulation of Three-Dimensional Terrain Effect[J]. Science in China:Serious D:Earth Sciences, 1997, 27(1): 15-20.[9] 黄兰珍,田宪谟. 电阻率法地形改正及其在工程地质勘查中的应用[J]. 物探化探计算技术, 1997, 19(03):238-241. Huang Lanzhen, Tian Xianmo, Topographic Correction for Resistivity Method and Its Application to Engineering Geological Prospecting[J]. Computing Techniques for Giophysical and Geochenical Exploration, 1997, 19(03):238-241.[10] 戴世坤,徐世浙. MT二维和三维连续介质快速反演[J]. 石油地球物理勘探, 1997,32(3): 305-317. Dai Shikun, Xu Shizhe. MT 2-D and 3-D Continuum Rapid Inversion[J]. Oil Geophysical Prospecting, 1997, 32(3): 305-317.[11] 晋光文,赵国泽,徐常芳,等. 二维倾斜地形对大地电磁资料的影响与地形校正[J]. 地震地质,1998,20(04): 454-458. Jin Guangwen,Zhao Guoze,Xu Changfang,et al. The Affection and Oorrection on Magnetotelluric Response Data for Inclination Two-Dimension Terrainseismology and Geology[J]. Seismology and Geology, 1998,20(04): 454-458.[12] 熊盛青. 航空伽玛能谱异常解释中地形影响及校正方法研究[J]. 地学前缘, 1998,5 (2):341. Xiong Shengqing. Study of Topographic Influence and Correction Method in the Airborne Gamma Spectrum Anomaly Interpretation[J]. Earth Science Frontiers, 1998, 5(2): 341.[13] 范正国,于长春. 航空伽马能谱地形改正新方法及应用[J] 物探与化探, 2005,29(1): 28-33. Fan Zhengguo, Yu Changchun. The Application of Electric Logging Curve to Calculating Mineralization Degree of Formation Water Geophysical and Geochemical Exploration[J]. 2005,29(1): 28-33.[14] 何继善,任宝琳. 用样条函数插值的电阻率地形改正方法[J]. 地质与勘探, 1984,24(7):39-43. He Jishan,Ren Baolin. Resistivity Terrain Correction Method Using Spline Function Interpolation[J]. Geology and Prospecting,1984,24(7) :39-43.[15] 张宗岭. 自然电位地形改正探讨[J]. 地质与勘探, 1989, 25(11):28-42. Zhang Zongling. Topographic Correction for Natural Potential Method[J]. Geology and Prospecting, 1989, 25(11):28-42.[16] 周明平. 瞬变电磁法测量中地形改正方法探讨[J]. 贵州地质, 2004, 21(2):117-120. Zhou Mingping. A Discussion on the Landform Rectified Way in Themeasurement of Transient Electromagnetic Method[J]. Guizhou Geology, 2004, 21(2):117-120.[17] Mackie R L, Smith J T, Madden T R. Three-Dimensional Electromagnetic Modeling Using Finite Difference Equations[J]. The Magnetotelluric Example: Radio Science, 1994, 29: 923-935.[18] Sasaki Y. Full 3d Inversion of Electromagnetic Data on Pc[J]. Journal of Applied Geophysics, 2001, 46: 45-54.[19] Smith J T. Conservative Modeling of 3d Electromagnetic Fields: Part I: Biconjugate Gradient Solution and an Accelerator[J]. Geophysics, 1996, 61: 1319-1324.[20] 谭捍东, 余钦范, Booker J, 等. 大地电磁法三维交错采样有限差分数值模拟[J]. 地球物理学报, 2003, 46(5): 705-711. Tan Handong, Yu Qinfan, Booker J, et al. Magnetotelluric Three-Dimensional Modeling Using the Staggered-Grid Finite Difference Method[J]. Chinese Journal of Geophysics, 2003,46(5): 705-711.[21] 顾观文,吴文鹂,李桐林. 大地电磁场三维地形影响的矢量有限元数值模拟[J]. 吉林大学学报:地球科学版,2014,44(5):1678-1686. Gu Guanwen, Wu Wenli, Li Tonglin. Modeling for the Effect of Magnetotelluric 3D Topography Based on the Vector Finite-Element Method[J]. Journal of Jilin University: Earth Science Edition, 2014, 44(5):1678-1686.[22] 史明娟,徐世浙. 大地电磁二次函数插值的有限元法正演模拟[J]. 地球物理学报, 1997, 40(3) :421-430. Shi Mingjuan, Xu Shizhe. Fintte Element Method Using Quadratic Etement in MT Forward Modeling[J]. Chinese Journal of Geophysics, 1997, 40(3) :421-430.[23] 王卫平, 曾昭发. 基于磁导率的频率域航空电磁法双频反演方法[J]. 地质科技情报, 2013,32(2): 181-186. Wang Weiping, Zeng Zhaofa. Frequency Domain Airborne Electromagnetic Dual-Frequency Inversion Method Based on Magnetic Permeability[J]. Geological Science and Technology Information,2013,32(2): 181-186. |
[1] | 曾昭发, 霍祉君, 李文奔, 李静, 赵雪宇, 何荣钦. 任意各向异性介质三维有限元航空电磁响应模拟[J]. 吉林大学学报(地球科学版), 2018, 48(2): 433-444. |
|