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Detection and Characterization of Fracture Zones in Bedrock - Possibilities and Limitations

Tassis, Georgios; Tsourlos, Panagiotis; Rønning, Jan Steinar and Dahlin, Torleif LU (2014) Near Surface Geoscience 2014 In [Host publication title missing]
Abstract
In Norway, resistivity measurements have already been tested in marine environments in order to detect subsea fracture zones. However, most of these data have been processed without taking into account the special conditions the presence of seawater creates. More recent studies worldwide have also applied ERT in marine conditions, but under more favorable conditions nevertheless since they dealt with brackish water of considerably higher resistivity than pure seawater. This study summarizes our efforts to establish basic rules when considering whether or not pure sea water ERT can satisfactorily detect weak zones inside resistive bedrock, a problem engineers in Norway usually come up against in tunnel construction sites. The scope for this... (More)
In Norway, resistivity measurements have already been tested in marine environments in order to detect subsea fracture zones. However, most of these data have been processed without taking into account the special conditions the presence of seawater creates. More recent studies worldwide have also applied ERT in marine conditions, but under more favorable conditions nevertheless since they dealt with brackish water of considerably higher resistivity than pure seawater. This study summarizes our efforts to establish basic rules when considering whether or not pure sea water ERT can satisfactorily detect weak zones inside resistive bedrock, a problem engineers in Norway usually come up against in tunnel construction sites. The scope for this study is related to the construction of a sub-sea tunnels and the potential application of ERT to detect fractured zones as part of the geotechnical study. Our results indicate that ERT surveys for fracture zone detection in Norwegian marine environments can be promising under certain conditions but at the same time ambiguous since they suffer from reduced resolution and major artificial effects. Based on the modeling results, we were able to improve interpretations of ERT measurements made across the straits at Kvitsøy and plan further investigations in southern Norway. (Less)
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author
organization
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type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
[Host publication title missing]
publisher
EAGE
conference name
Near Surface Geoscience 2014
external identifiers
  • Scopus:84908374264
DOI
10.3997/2214-4609.20142126
language
English
LU publication?
yes
id
40e9cb83-4977-4859-b828-e3a3b2f40b79 (old id 4935909)
date added to LUP
2015-01-19 14:48:28
date last changed
2016-10-13 04:38:36
@misc{40e9cb83-4977-4859-b828-e3a3b2f40b79,
  abstract     = {In Norway, resistivity measurements have already been tested in marine environments in order to detect subsea fracture zones. However, most of these data have been processed without taking into account the special conditions the presence of seawater creates. More recent studies worldwide have also applied ERT in marine conditions, but under more favorable conditions nevertheless since they dealt with brackish water of considerably higher resistivity than pure seawater. This study summarizes our efforts to establish basic rules when considering whether or not pure sea water ERT can satisfactorily detect weak zones inside resistive bedrock, a problem engineers in Norway usually come up against in tunnel construction sites. The scope for this study is related to the construction of a sub-sea tunnels and the potential application of ERT to detect fractured zones as part of the geotechnical study. Our results indicate that ERT surveys for fracture zone detection in Norwegian marine environments can be promising under certain conditions but at the same time ambiguous since they suffer from reduced resolution and major artificial effects. Based on the modeling results, we were able to improve interpretations of ERT measurements made across the straits at Kvitsøy and plan further investigations in southern Norway.},
  author       = {Tassis, Georgios and Tsourlos, Panagiotis and Rønning, Jan Steinar and Dahlin, Torleif},
  language     = {eng},
  publisher    = {ARRAY(0x8ca6008)},
  series       = {[Host publication title missing]},
  title        = {Detection and Characterization of Fracture Zones in Bedrock - Possibilities and Limitations},
  url          = {http://dx.doi.org/10.3997/2214-4609.20142126},
  year         = {2014},
}