Influence of the borehole and its filling medium on crosshole georadar data: experimental evidence and numerical simulations
Détails
ID Serval
serval:BIB_5AB1288360F5
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Collection
Publications
Institution
Titre
Influence of the borehole and its filling medium on crosshole georadar data: experimental evidence and numerical simulations
Titre de la conférence
Proceeding of the 10th International Conference on Ground Penetrating Radar, Delft, The Netherlands
ISBN
90-9017959-3
Statut éditorial
Publié
Date de publication
2004
Volume
1
Pages
237-240
Langue
anglais
Résumé
The reliability of tomographic attenuation images depends critically
on the a priori assumptions of the inverse procedures. One important
assumption is that the radiation patterns can be represented by formulas
for dipole antennas located in a homogeneous full-space. Modeling
studies suggest that this assumption is valid for gas-filled boreholes,
but is violated for water-filled ones. To test experimentally these
numerical results we developed a special packer system. This allows
us to isolate the effects of the borehole filling by comparing data
gathers measured with (gas-filled hole) and without the packer system
(water-filled hole). Our experimental results demonstrate that the
radiative characteristics of borehole antennas do indeed differ substantially
for gas- and water-filled boreholes and that the dominant effects
are correctly predicted by simple modeling approaches.
on the a priori assumptions of the inverse procedures. One important
assumption is that the radiation patterns can be represented by formulas
for dipole antennas located in a homogeneous full-space. Modeling
studies suggest that this assumption is valid for gas-filled boreholes,
but is violated for water-filled ones. To test experimentally these
numerical results we developed a special packer system. This allows
us to isolate the effects of the borehole filling by comparing data
gathers measured with (gas-filled hole) and without the packer system
(water-filled hole). Our experimental results demonstrate that the
radiative characteristics of borehole antennas do indeed differ substantially
for gas- and water-filled boreholes and that the dominant effects
are correctly predicted by simple modeling approaches.
Création de la notice
25/11/2013 19:28
Dernière modification de la notice
20/08/2019 15:13
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