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《Oil Geophysical Prospecting》 2002-05
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2-D inversion of magnetotelluric (MT) sounding data by dimension-descending approaching method.

Su Zhuliu and Hu Wenbao.Department of Geophysical Exploration,Jianghan Petroleum College,No.1,Jinzhounan Road,Jingzhou City,Hubei province,434102, China  
The paper presented a new 2 D MT inversion method-dimension descending method,which divided each 2 D inversion iteration into two process:a 2 D forward problem and precise 1 D inversion for each survey point,avoiding two difficult problems in calculating process: solving the partial derivative matrix and calculating the inverse of large scale set of inversion equations and speeding up the inversion because of only one 2 D forward calculating for each iteration.The model tests show that the method is a stable convergent,practical and more precise method.Its maximum horizontal resolution is equal to the distance between adjacent MT survey points while vertical resolution can maximally reflect the structural resolution that the survey data can do.The method can better restore the geo electric structural attitude in a scope of MT intrinsic equivalence.The theory and the practice show that the inversion method has better results than synchronized array MT sounding (SAMT) and continuous electromagnetic profiling(CEMP).
【Fund】: 中国石油天然气集团公司“十五”项目资助 (项目名称 :电磁勘探新技术 ;项目编号 :20010204)
【CateGory Index】: P631.3
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