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Methods to reduce banding effects in 3-D resistivity inversion

Loke, M. H. and Dahlin, T. LU (2010) 16th European Meeting of Environmental and Engineering Geophysics, Near Surface 2010
Abstract

Three-dimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3-D data set is collated from a series of parallel 2-D survey lines, and frequently the distance between the lines is more than the electrode spacing along the lines. The inversion of such data sets frequently produce models with banded near-surface anomalies that are aligned parallel (or perpendicular) to the lines. It is shown that such banded structures can be caused by the data acquisition geometry. Several modifications to the smoothness-constrained least-squares inversion method are examined to reduce such artifacts in the inversion model. One method is to use a higher damping factor for the model cells in the... (More)

Three-dimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3-D data set is collated from a series of parallel 2-D survey lines, and frequently the distance between the lines is more than the electrode spacing along the lines. The inversion of such data sets frequently produce models with banded near-surface anomalies that are aligned parallel (or perpendicular) to the lines. It is shown that such banded structures can be caused by the data acquisition geometry. Several modifications to the smoothness-constrained least-squares inversion method are examined to reduce such artifacts in the inversion model. One method is to use a higher damping factor for the model cells in the near-surface layers. The banding effects can also be reduced using a model discretization such that the width and length of the model cells are similar although the spacing between the lines is larger than the in-line electrode spacing. The remaining banding artifacts can be further reduced by modifying the horizontal roughness filter used such that it has components in the diagonal directions as well as in the directions along and perpendicular to the 2-D survey lines.

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Near Surface Geoscience 2010
publisher
European Association of Geoscientists and Engineers, EAGE
conference name
16th European Meeting of Environmental and Engineering Geophysics, Near Surface 2010
conference location
Zurich, Switzerland
conference dates
2010-09-06 - 2010-09-08
external identifiers
  • scopus:84896348878
ISBN
9781629937892
language
English
LU publication?
yes
id
7026a15b-3306-4bc4-bdd4-0054ffd6ee7f
date added to LUP
2018-12-21 15:54:54
date last changed
2019-02-20 11:42:52
@inproceedings{7026a15b-3306-4bc4-bdd4-0054ffd6ee7f,
  abstract     = {<p>Three-dimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3-D data set is collated from a series of parallel 2-D survey lines, and frequently the distance between the lines is more than the electrode spacing along the lines. The inversion of such data sets frequently produce models with banded near-surface anomalies that are aligned parallel (or perpendicular) to the lines. It is shown that such banded structures can be caused by the data acquisition geometry. Several modifications to the smoothness-constrained least-squares inversion method are examined to reduce such artifacts in the inversion model. One method is to use a higher damping factor for the model cells in the near-surface layers. The banding effects can also be reduced using a model discretization such that the width and length of the model cells are similar although the spacing between the lines is larger than the in-line electrode spacing. The remaining banding artifacts can be further reduced by modifying the horizontal roughness filter used such that it has components in the diagonal directions as well as in the directions along and perpendicular to the 2-D survey lines.</p>},
  author       = {Loke, M. H. and Dahlin, T.},
  isbn         = {9781629937892},
  language     = {eng},
  location     = {Zurich, Switzerland},
  month        = {01},
  publisher    = {European Association of Geoscientists and Engineers, EAGE},
  title        = {Methods to reduce banding effects in 3-D resistivity inversion},
  year         = {2010},
}