3D MAGNETIC INVERSION WITH SPARSENESS CONSTRAINTS BASED ON RESIDUAL NODE SUSCEPTIBILITY

Xiu, Ch.; Meng, X.; Zhang, S.; Zhang, X.
Abstract:
For generalized inversion, non L2-norm inversions have been widely used in geophysical inversion to obtain sharp and blocky models. However, problems such as the boundary of anomaly body obtained by inversion is not clear enough and the recovered residual susceptibility value is far less than or greater than the true susceptibility generally exist. In this paper a new 3D magnetic inversion approach based on residual node susceptibility is proposed. The residual node susceptibility model comes from residual block susceptibility model and it has special sparse properties for the underground structure, especially for blocky models. Cauchy norm is used to impose sparseness on model parameters. Depth weighting function essentially allows equal chance for blocks at different depths to be nonzero to avoid the ‘skin effect’. Iterative Reweighted Least Square algorithm is employed to solve the inverse problems. Then the residual node susceptibility model need to be converted into residual block susceptibility model through the zeros boundary layer. Synthetic data test and real data proved the effectiveness of the proposed method.
SGEM Research areas:
Year:
2017
Type of Publication:
In Proceedings
Keywords:
magnetic inversion; residual node susceptibility; sparseness inversion
Volume:
17
SGEM Book title:
17th International Multidisciplinary Scientific GeoConference SGEM 2017
Book number:
13
SGEM Series:
International Multidisciplinary Scientific GeoConference-SGEM
Pages:
3-10
Publisher address:
51 Alexander Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
Period:
29 June - 5 July, 2017
ISBN:
978-619-7105-00-1
ISSN:
1314-2704
Conference:
17th International Multidisciplinary Scientific GeoConference SGEM 2017, 29 June - 5 July, 2017
DOI:
10.5593/sgem2017/13/S03.001
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