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《Chinese Journal of Geophysics》 2015-02
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Selection of parameter types in Controlled Source Electromagnetic Method

WENG Ai-Hua;LI Da-Jun;LI Ya-Bin;LI Si-Rui;YANG Da-Fang;YANG Yue;LIU Yun-He;College of Geoscience and Technology,Jilin University;  
Three-dimensional controlled-source electromagnetic method has become a major scheme of deep-buried object exploration.A lot of factors affect the 3Dexploration results of the method.In this paper,by means of 3Dinversion,we will use five different parameters as examples to discuss how to choose appropriate observing parameter set in 3DCSEM in order to obtain optimal result.Limited-memory quasi-Newton method is used to inverse the synthetic 3D CSEM data.Electromagnetic fields from grounded current line source are computed by applying staggered-grid finite difference method to the Helmholtz′s equation regarding to the secondary electrical field with primary field considered in source term at the right hand side.Five data sets of different parameter type are considered,e.g.complex Ex,amplitude of Ex,a combination by Exand Ey,or Exand Hy,and impedance element Zxyderived fromExand Hy.A 1km long grounded current line is laid out 7500 maway from observing sites.Current emitted is 1 A;source frequency is set to 10 Hz.Totally 200 sites are distributed along 10profiles;line spacing is 100 m,while station separation is 50 m.On each observing site,Ex,Ey and Hy will be measured,from which five different possible parameter combinations,complex Ex,amplitude of Ex,Explus Ey,Ex plus Hy,and impedance element Zxycomputed fromExand Hy,are input into the inversion.8bodies of different conductivity are embedded into half space.The 3D model is divided into 30×30×20grids;cell dimensions is 50 m×50 m×50 min the model center,and doubles in the outside 5 border layers. All inversions start from a homogeneous half space,and terminate after 120 iterations.Numerical results show that(1)with a single Excomponent as inversion data,the shallow 3Dbodies can be definitely obtained;(2)as an important parameter reflecting EM induction effect,the phase of Exis more sensitive to conductive abnormal;as a result,its incorporation into the inversion enhances the deep abnormal resolution,so complex Exis prior to Ex amplitude;(3)when combined by Eycomponent,not only the indistinct boundary in y-direction of the model inversed from only Exis sharpened,but also the deep structure is revealed;(4)but if Hyis bound to Exin inversion,the results are almost the same as that from Ex;at this point,Hydoes not add more information to the inversion;(5)on contrast,if Hyis used to normalize Ex,getting impedance Zxyas inversion input,both deep and shallow bodies can be delineated.Numerical results show that in controlled source EM method,it is best to observe Exand Hy,and use the derived parameter Zxyas inversion parameter;and if the magnetic field Hyis not available,the complement of Eyis a appropriate choice to compensate the loss of magnetic tensor;as the last resort,complex Ex,or both amplitude and phase,should be observed.If only the amplitude is available,there exist very large uncertainties in deep structure.Our results coincide with the application in CSAMT method where Zxyis often used as inversion parameter,yet which is not confirmed by 3D modeling.
【Fund】: 国家重大科技仪器专项(2011YQ05006010)资助
【CateGory Index】: P631.325
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