可控源电磁法倾子响应的三维正演
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摘要
为克服天然场源的大地电磁磁场信号弱、易受电磁干扰、倾子资料计算难度大等不足,提出了可控源电磁倾子资料观测、处理与解释方法。通过可控源频域电磁法三维正演的磁场三分量,依据倾子定义计算了三维异常体在地面的倾子参数,绘制了异常体上方不同测点的倾子振幅、相位、实部与虚部曲线及纵、横剖面。结果表明,与场源平行的剖面上倾子响应的振幅、实部与虚部对地下横向不均匀异常体边界反演灵敏,能够有效反应出地下电性异常体重要信息,并且能够正确的与正演模型相吻合;倾子响应横切片图中表明,倾子相位能够显示地下电性异常体的位置,并能够很好的确定异常体的中心;研究不同频率条件下,地下电性异常体的倾子响应特征,发现倾子资料具有测深的功能。可见可控源电磁法倾子资料能够用于地下地质构造的解释,并能准确划分异常体边界的确定中心位置。说明可控源倾子电磁法有着很好的理论基础,具有良好的应用前景。
In order to overcome the disadvantages of the weakness signal of the components of magnetic field in magnetotelluric (MT),disturbed by electromagnetic (EM) noises easily,difficulty of the tipper caculation,the data for observation,processing and interpretation of the controlled source electromagnetic (CSEM) tipper method were used to investigate. By means of three-dimensional CSEM forward modeling,three components of magnetic field were calculated. The curves and orthogonal profiles of tipper amplitude,phase,real and imaginary over anomalous body were drawn to used as feature analysis. The results show that the amplitude,real and imaginary of tipper on the profile parallel to the source are very sensitive to the boundary of the anomalous body,and exhibit more important information to the body,which are correspond to the forward model. From the slices of the amplitude,phase,real and imaginary of tipper at different frequencies the position of body can be identified easily. The different features at different frequencies show that the tipper can be used for sounding. All of which can be used to confirm that the tipper data can be used for the interpretation of underground geological structures,so that the boundaries and the center of body can be identified. It is concluded that the controlled source electromagnetic tipper has a firm foundation of EM theory,and shows a good prospect in electrical exploration.
In order to overcome the disadvantages of the weakness signal of the components of magnetic field in magnetotelluric (MT),disturbed by electromagnetic (EM) noises easily,difficulty of the tipper caculation,the data for observation,processing and interpretation of the controlled source electromagnetic (CSEM) tipper method were used to investigate. By means of three-dimensional CSEM forward modeling,three components of magnetic field were calculated. The curves and orthogonal profiles of tipper amplitude,phase,real and imaginary over anomalous body were drawn to used as feature analysis. The results show that the amplitude,real and imaginary of tipper on the profile parallel to the source are very sensitive to the boundary of the anomalous body,and exhibit more important information to the body,which are correspond to the forward model. From the slices of the amplitude,phase,real and imaginary of tipper at different frequencies the position of body can be identified easily. The different features at different frequencies show that the tipper can be used for sounding. All of which can be used to confirm that the tipper data can be used for the interpretation of underground geological structures,so that the boundaries and the center of body can be identified. It is concluded that the controlled source electromagnetic tipper has a firm foundation of EM theory,and shows a good prospect in electrical exploration.
引文
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15周峰,张志勇,蓝泽鸾,等.基于二次场算法的时间域激电2.5D有限元正演[J].科学技术与工程,2014,14(18):163-167Zhou Feng,Zhang Zhiyong,Lan Zeluan,et al.Finite element numerical simulation of 2.5 dimensions time-domain IP based on secondary field[J].Science Technology and Engineering,2014,14(18):163-167
16糜利栋,姜汉桥,李俊键,等.基于有限元分析的页岩气扩散数值模拟[J].科学技术与工程,2014,14(21):70-75Mi Lidong,Jiang Hanqiao,Li Junjian,et al.Shale gas diffusion simulations in porous organic kerogen media using finite element analyses[J].Science Technology and Engineering,2014,14(21):70-75
2 Ledo J,Gabàs A,Marcuello A.Static shift levelling using geomagnetic transfer functions[J].Earth Planets and Space,2014,54:493-498
3陈小斌,赵国泽,詹艳,等.磁顷子矢量的图示分析及其应用研究[J].地学前缘,2004,11(4):626-636Chen Xiaobin,Zhao Guoze,ZhanYan,et al.Analysis of tipper visual vectors and its application[J].Earth Science Frontiers,2004,11(4):626-636
4陈清礼,胡文宝,李金铭,等.埋藏球体的顷子响应特征分析[J].石油天然气学报,2007,29(3):75-78Chen Qingli,Hu Wenbao,Li Jinming,et al.Characteristics of tipper response of buried sphere[J].Journal of Oil and Gas Technology,2007,29(3):75-78
5林昌洪,谭捍东,佟拓.顷子资料三维共轭梯度反演研究[J].地球物理学报,2011,54(4):1106-1113Lin Changhong,Tan Handong,Tong Tuo.Three-dimensional conjugate gradient inversion of tipper data[J].Chinese Journal of Geophysics,2011,54(4):1106-1113
6 Holthma E,Oldenburg D W.Large-scale inversion of ZTEM data[J].Geophysics,2012,77(4):37-45
7柳建新,甘佳雄,董孝忠,等.板状体MT倾子响应的二维有限元模拟与定性分析[J].物探化探与计算技术,2012,34(5):541-547Liu Jianxin,Gan Jiaxiong,Dong Xiaozhong,et al.Finite element simulation and qualitative analysis of two-dimensional MT tipper response of tabular body[J].Computing Techniques for Geophysical and Geochemical,2012,34(5):541-547
8吴頔,严家斌,贺文根.顷子对异常体的分辨能力及影响因素研究[J].地球物理学进展,2012,27(6):2656-2663Wu Di,Yan Jiabin,He Wengen.Study on distinguishing to anomalous body by tipper and influencing factor of tipper[J].Progress in Geophysics,2012,27(6):2656-2663
9余年,胡祥云,王绪本,等.大地电磁二维顷子和视倾子模拟及其应用研究[J].西南交通大学学报,2014,49(2):268-275Yu Nian,Hu Xiangyun,Wang Xuben,et al.Two-dimensional magnetotelluric tipper and apparent tipper:Simulation and application[J].Journal of Southwest Jiaotong University,2014,49(2):268-275
10 Wang T,Tan H D,Li Z Q,et al.3D finite-difference modeling algorithm and anomaly features of ZTEM[J].Applied Geophysics,2016,13(3):553-560
11李志强,荣耀,谭捍东.ZTEM三维数据空间OCCAM反演研究[J].地球物理学进展,2018,33(4):1526-1532Li Zhiqiang,Rong Yao,Tan Handong.Three-dimensional dataspace OCCAM inversion of ZTEM[J].Progress in Geophysics,2018,33(4):1526-1532
12谢淮北,王岩,李成,等.电磁磨料射流直管射流水介质运动特征数值模拟分析[J].科学技术与工程,2018,18(35):184-188Xie Huaibei,Wang Yan,Li Cheng,et al.Numerical simulation analysis of the motion characteristics of electromagnetic abrasive jet straight tube jet water medium[J].Science Technology and Engineering,2018,18(35):184-188
13郝伟,陆努,王树涛,等.页岩气藏数值模拟研究进展[J].科学技术与工程,2016,16(13):143-150Hao Wei,Lu Nu,Wang Shutao,et al.A survey of numerical simulation study for shale gas[J].Science Technology and Engineering,2016,16(13):143-150
14窦新宇,梁华庆,沈维.双水平井电磁测距径向距离计算方法[J].科学技术与工程,2016,16(33):24-28Dou Xinyu,Laing Huaqing,Shen Wei.Double horizontal electromagnetic radial distance calculation method study[J].Science Technology and Engineering,2016,16(33):24-28
15周峰,张志勇,蓝泽鸾,等.基于二次场算法的时间域激电2.5D有限元正演[J].科学技术与工程,2014,14(18):163-167Zhou Feng,Zhang Zhiyong,Lan Zeluan,et al.Finite element numerical simulation of 2.5 dimensions time-domain IP based on secondary field[J].Science Technology and Engineering,2014,14(18):163-167
16糜利栋,姜汉桥,李俊键,等.基于有限元分析的页岩气扩散数值模拟[J].科学技术与工程,2014,14(21):70-75Mi Lidong,Jiang Hanqiao,Li Junjian,et al.Shale gas diffusion simulations in porous organic kerogen media using finite element analyses[J].Science Technology and Engineering,2014,14(21):70-75