Advanced search

Case studies of incorporation of prior information in electrical resistivity tomography : comparison of different approaches

(2014) NEAR SURFACE GEOPHYSICS. 12(4). p.451-465
Author
Organization
Abstract
Many geophysical inverse problems are ill-posed and their solution non-unique. It is thus important to reduce the amount of mathematical solutions to more geologically plausible models by regularizing the inverse problem and incorporating all available prior information in the inversion process. We compare three different ways to incorporate prior information for electrical resistivity tomography (ERT): using a simple reference model, adding structural constraints to Occam's inversion and using geostatistical constraints. We made the comparison on four real cases representing different field applications in terms of scales of investigation and level of heterogeneities. In those cases, when electromagnetic logging data are available in boreholes to control the solution, it appears that incorporating prior information clearly improves the correspondence with logging data compared to the standard smoothness constraint. However, the way to incorporate it may have a major impact on the solution. A reference model can often be used to constrain the inversion; however, it can lead to misinterpretation if its weight is too strong or the resistivity values inappropriate. When the computation of the vertical and/or horizontal correlation length is possible, the geostatistical inversion gives reliable results everywhere in the section. However, adding geostatistical constraints can be difficult when there is not enough data to compute correlation lengths. When a known limit between two layers exists, the use of structural constraint seems to be more indicated particularly when the limit is located in zones of low sensitivity for ERT. This work should help interpreters to include their prior information directly into the inversion process through an appropriate way.
Keywords
SALT-WATER INFILTRATION, OCCAMS INVERSION, GEOPHYSICAL-DATA, SEISMIC DATA, SMOOTH, MODEL, INJECTION, GEOLOGY

Citation

Please use this url to cite or link to this publication:

Chicago
Caterina, David, Thomas Hermans, and Frédéric Nguyen. 2014. “Case Studies of Incorporation of Prior Information in Electrical Resistivity Tomography : Comparison of Different Approaches.” Near Surface Geophysics 12 (4): 451–465.
APA
Caterina, David, Hermans, T., & Nguyen, F. (2014). Case studies of incorporation of prior information in electrical resistivity tomography : comparison of different approaches. NEAR SURFACE GEOPHYSICS, 12(4), 451–465.
Vancouver
1.
Caterina D, Hermans T, Nguyen F. Case studies of incorporation of prior information in electrical resistivity tomography : comparison of different approaches. NEAR SURFACE GEOPHYSICS. 2014;12(4):451–65.
MLA
Caterina, David, Thomas Hermans, and Frédéric Nguyen. “Case Studies of Incorporation of Prior Information in Electrical Resistivity Tomography : Comparison of Different Approaches.” NEAR SURFACE GEOPHYSICS 12.4 (2014): 451–465. Print.
@article{8539850,
  abstract     = {Many geophysical inverse problems are ill-posed and their solution non-unique. It is thus important to reduce the amount of mathematical solutions to more geologically plausible models by regularizing the inverse problem and incorporating all available prior information in the inversion process. We compare three different ways to incorporate prior information for electrical resistivity tomography (ERT): using a simple reference model, adding structural constraints to Occam's inversion and using geostatistical constraints. We made the comparison on four real cases representing different field applications in terms of scales of investigation and level of heterogeneities. In those cases, when electromagnetic logging data are available in boreholes to control the solution, it appears that incorporating prior information clearly improves the correspondence with logging data compared to the standard smoothness constraint. However, the way to incorporate it may have a major impact on the solution. A reference model can often be used to constrain the inversion; however, it can lead to misinterpretation if its weight is too strong or the resistivity values inappropriate. When the computation of the vertical and/or horizontal correlation length is possible, the geostatistical inversion gives reliable results everywhere in the section. However, adding geostatistical constraints can be difficult when there is not enough data to compute correlation lengths. When a known limit between two layers exists, the use of structural constraint seems to be more indicated particularly when the limit is located in zones of low sensitivity for ERT. This work should help interpreters to include their prior information directly into the inversion process through an appropriate way.},
  author       = {Caterina, David and Hermans, Thomas and Nguyen, Fr{\'e}d{\'e}ric},
  issn         = {1569-4445},
  journal      = {NEAR SURFACE GEOPHYSICS},
  language     = {eng},
  number       = {4},
  pages        = {451--465},
  title        = {Case studies of incorporation of prior information in electrical resistivity tomography : comparison of different approaches},
  url          = {http://dx.doi.org/10.3997/1873-0604.2013070},
  volume       = {12},
  year         = {2014},
}

Altmetric
View in Altmetric
Web of Science
Times cited: