Abstract:It is discovered through the comparing the responses of MT apparent resistivity and phase of 3-D geologic prism conductor model with 2~D geologic rectangle conductor model that the response of 2-D TM mode is close to that of 3-D YX mode and the existed position of conductor could be determined by the inversion of single TM mode but inverted the resistivity is greater than the real value;the response of 2-D TE mode is large different to that of 3~D XY mode at low frequency and the resistivity of conductor could be reflected by the inversion of TE mode but the phenomenon of stretched conductor exists in vertical direction.The resuhs of joint inversion of TE and TM combine the advantages of inversion of TE with TM mode,which can better invert the existed position and resistivity.The results of 2-D inversion are difficult in reflection of real 3-D structure along with the increasing buried depth of good conductor;using 2-D inversion can still cffcctivcly reflect the exist of 3 D anomalous body if increasing the oriental length and scale of 3-D anomalous body.
胡祖志, 胡祥云, 何展翔. 三维大地电磁数据的二维反演解释[J]. 石油地球物理勘探, 2005, 40(3): 353-359.
Hu Zu-zhi, Hu Xiang-yun, He Zhan-xi~ ang. Using 2-D inversion for interpreiaiiuu oi 3-D mT data. OGP, 2005, 40(3): 353-359.