Sensitivity study on two-dimensional and three-dimensional magnetotelluric inversions

被引:2
|
作者
Meng LuTing [1 ,2 ]
Zhang HuiQian [1 ,2 ]
Huang QingHua [1 ,2 ]
机构
[1] Peking Univ, Sch Earth & Space Sci, Dept Geophys, Beijing 100871, Peoples R China
[2] Peking Univ, Hebei Hongshan Natl Observ Thick Sediments & Seis, Beijing 100871, Peoples R China
来源
关键词
Magnetotelluric; Three-dimensional forward and inversion; Sensitivity matrix; BAYESIAN INVERSION; RESISTIVITY STRUCTURE; ELECTRICAL STRUCTURE; REFINED TECHNIQUES; PROFILE DATA; MODEL; MANTLE; DEPTH; CRUST; AREA;
D O I
10.6038/cjg2022P0976
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Magnetotelluric inversion can be applied to lithospheric structure investigation, metal solid minerals and geothermal resource exploration. Currently, three-dimensional inversion is becoming more mature, but two-dimensional inversion is still widely used. Due to the complexity of the structure and station networks, magnetotelluric data often combine two-dimensional and three-dimensional inversion to reduce the computational burden and refine inversion model. Evaluating two-dimensional and three-dimensional inversion models and their differences are essential to accurately obtain subsurface electrical structure. In this paper, we propose a sensitivity matrix-based method for delineating the boundary of electrical anomalies and assessing the reliability of inversion models. The method constructs the sensitivity matrix by solving the adjoint problem of magnetotelluric forward modeling and evaluates the reliability of the inversion results without designing additional models. In addition, we also investigate the effective sounding depth in two-dimensional and three-dimensional inversions using synthetic data. When the subsurface structure does not dominate by the three-dimensionality, the two-dimensional inversion can effectively recover the resistivity values of the deep low resistivity anomalies and provide quantitative constraints for the deep geological interpretation. However, when the subsurface structure shows dominant three-dimensionality, the boundary reconstructed by three-dimensional inversion is more consistent with the real location, while two-dimensional inversion will produce artifacts and hinder further geological interpretation.
引用
收藏
页码:3078 / 3087
页数:10
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