Methods to reduce banding effects in 3D resistivity inversion
(2010) 16th European Meeting of Environmental and Engineering Geophysics, Near Surface 2010 Abstract
Threedimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3D data set is collated from a series of parallel 2D 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 nearsurface 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 smoothnessconstrained leastsquares 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)
Threedimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3D data set is collated from a series of parallel 2D 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 nearsurface 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 smoothnessconstrained leastsquares 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 nearsurface 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 inline 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 2D survey lines.
(Less)
 author
 Loke, M. H. and Dahlin, T. ^{LU}
 organization
 publishing date
 20100101
 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
 20100906  20100908
 external identifiers

 scopus:84896348878
 ISBN
 9781629937892
 language
 English
 LU publication?
 yes
 id
 7026a15b33064bc4bdd40054ffd6ee7f
 date added to LUP
 20181221 15:54:54
 date last changed
 20190220 11:42:52
@inproceedings{7026a15b33064bc4bdd40054ffd6ee7f, abstract = {<p>Threedimensional surveys are required to accurately resolve structures in very complex areas. In many cases the 3D data set is collated from a series of parallel 2D 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 nearsurface 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 smoothnessconstrained leastsquares 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 nearsurface 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 inline 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 2D 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 3D resistivity inversion}, year = {2010}, }