3-D DC resistivity modeling and inversion using multi-resolution framework

被引：0

作者：

Gao J. ^{[1
]}

Smirnov M. ^{[1
]}

Smirnova M. ^{[2
]}

Egbert G. ^{[3
]}

机构：

[1] Luleå University of Technology, Luleå

[2] University of Cologne, Köln

[3] Oregon State University, Corvallis

来源：

Exploration Geophysics | 2019年 / 2019卷 / 01期

关键词：

Direct Current Resistivity method; inversion; modeling; multi-resolution grid;

D O I：

10.1080/22020586.2019.12073116

中图分类号：

学科分类号：

摘要：

We discuss the implementation of multi-resolution framework to 3-D Direct Current (DC) problem. Commonly used staggered (SG) grid fixes the horizontal grid resolution for all depths. Thus, employing the fine horizontal resolution may lead to an over-discretised forward problem, subsequently affecting the performance of the inversion. We implemented a novel multi-resolution (MR) grid approach to the 3-D DC modeling and inversion problem, which allows adjustment of the horizontal resolution with depth. By using finer resolution for the near-surface regions, MR grid can ensure the modeling accuracy and describe the shallow features in the inversion model as well. The ability to use relatively coarser horizontal resolution for the deeper regions reduces the computation costs compare to the SG grid modeling. As a result, modeling and inversion can be accelerated several times by solving a smaller problem. Our grid resembles non-conformal rectangular grid, which commonly used in finite-elements modelling. © 2019, Taylor and Francis. All rights reserved.

引用

共 3 条

[1] Loke M.H., Chambers J.E., Rucker D.F., Kuras O., Wilkinson P.B., Recent developments in the direct-current geoelectrical imaging method, Journal of Applied Geophysics, 95, pp. 135-156, (2013)
[2] Lowry T., Singularity removal: A refinement of resistivity modeling techniques, Geophysics, 54, 6, (1989)
[3] Mackie R.L., Madden T.R., Three-dimensional magnetotelluric inversion using conjugate gradients, Geophysical Journal International, 115, pp. 215-229, (1993)

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