The effects of grid subdivision on the accuracy of MT inversion
ZHU Chong-Li1,2, DONG Yun2, WANG Yan-Ping3, ZHOU Dian-Gang4, SUN Wen5, HE Zhao-Yong5
1. Key Laboratory of Earth Exploration and Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China; 2. Luzhou Vocational&Technical College, Luzhou 646005, China; 3. Shandong University of Technology, Zibo 255000, China; 4. 109 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources, Chengdu 610059, China; 5. Chengdu University of Technology, Chengdu 610059, China
Abstract：The problem whether the grid subdivision is suitable or not constitutes a prerequisite for the accuracy of the inversion results. Using different models and different inversion methods, the authors made a comparative study to detect the effects of two different grids on the accuracy of inversion. The employment of the two different ways of grid subdivision shows that, on the whole, the coarse grid has higher simulation precision than the fine grid in the depth, but at the starting stage of near-surface, the amplitude of fluctuation of the coarse grid and that of the fine grid are both relatively large, i.e., both obviously deviate from the normal value. The simulation accuracy of the fine grid is better than that of the coarse grid. The overall change in the coarse grid is more smooth than the fine grid, and the inversion accuracy of the coarse grid for the anomalous body of low resistance is better; nevertheless, for abnormal body of high resistance, the inversion accuracy is poorer, and the value widely deviates from the real value.
朱崇利, 董云, 王延平, 周佃刚, 孙文, 何兆容. 网格剖分对大地电磁测深反演精度的影响[J]. 物探与化探, 2014, 38(4): 737-741.
ZHU Chong-Li, DONG Yun, WANG Yan-Ping, ZHOU Dian-Gang, SUN Wen, HE Zhao-Yong. The effects of grid subdivision on the accuracy of MT inversion. Geophysical and Geochemical Exploration, 2014, 38(4): 737-741.
