Abstract:The paper presented a new 2-D MT inversion method一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).
苏朱刘, 胡文宝. 大地电磁测深"降维逼近法"二维反演[J]. 石油地球物理勘探, 2002, 37(5): 516-523.
Su Zhuliu, Hu Wenbao. 2-D inversion of magnetotelluric(MT) sounding data by dimension-descending approaching method. OGP, 2002, 37(5): 516-523.