Quasi-2D inversion of DCR and TDEM data for shallow investigations

Joint or sequential inversion of direct current resistivity (DCR) and time-domain electromagnetic (TDEM) data commonly are performed for individual soundings assuming layered earth models. DCR and TDEM have different and complementary sensitivity to resistive and conductive structures, making them suitable methods for the application of joint inversion techniques. This potential joint inversion of DCR and TDEM methods has been used by several authors to reduce the ambiguities of the models calculated from each method separately. A new approach for joint inversion of these data sets, based on a laterally constrained algorithm, was found. The method was developed for the interpretation of soundings collected along a line over a 1D or 2D geology. The inversion algorithm was tested on two synthetic data sets, as well as on field data from Saudi Arabia. The results show that the algorithm is efficient and stable in producing quasi-2D models from DCR and TDEM data acquired in relatively complex environments.

[1]  A. Raiche.  The effect of ramp function turn-off on the TEM response of layered earth , 1984 .

[2]  M. Meju,et al.  Joint inversion of TEM and distorted MT soundings, Some effective practical considerations , 1996 .

[3]  A. Christiansen,et al.  Quasi-3D modeling of airborne TEM data by spatially constrained inversion , 2008 .

[4]  E. P. Gustafson,et al.  Minimizing Interpretation Ambiguities Through Joint Inversion of Surface Electrical Data , 1987 .

[5]  Esben Auken,et al.  Layered and laterally constrained 2D inversion of resistivity data , 2004 .

[6]  A. Dupis,et al.  Geosounding Principles, 1. Resistivity Sounding Measurements: O. Koefoed. Methods in Geochemistry and Geophysics, 14A. Elsevier, Amsterdam, 1979, xiv + 276 pp. + 11 pp. encl., Dfl. 130.00., approx. US $ 66.50, ISBN 0-444-41704-4 , 1980 .

[7]  K. Vozoff,et al.  The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures , 1985 .

[8]  T. Harinarayana.  Combination of EM and DC Measurements For Upper Crustal Studies , 1999 .

[9]  M. Descloîtres,et al.  Mapping Coastal Aquifers by Joint Inversion of DC and TEM Soundings‐Three Case Histories , 2001 .

[10]  D. Oldenburg,et al.  Estimating depth of investigation in DC resistivity and IP surveys , 1999 .

[11]  David L.B. Jupp,et al.  Joint Inversion of Geophysical Data , 2007 .

[12]  S. Sandberg,et al.  EXAMPLES OF RESOLUTION IMPROVEMENT IN GEOELECTRICAL SOUNDINGS APPLIED TO GROUNDWATER INVESTIGATIONS1 , 1993 .

[13]  Partha S. Routh,et al.  Model reliability for 3D electrical resistivity tomography: Application of the volume of investigation index to a time-lapse monitoring experiment , 2007 .

[14]  E. Auken,et al.  Mutually Constrained Inversion (MCI) of Electrical and Electromagnetic Data , 2001 .

[15]  O. Koefoed,et al.  Geosounding Principles: Resistivity Sounding Measurements , 1980 .

[16]  K. Vozoff.  Geosounding principles 1. Resistivity sounding measurements, methods in geochemistry and geophysics, 14a: O. Koefoed. Elsevier, Amsterdam, 1979, 272 pp., US $ 65.50, Df. 130.00 , 1981 .

[17]  On the 3-D inversion of vertical electrical soundings: Application to the South Ismailia area—Cairo desert road, Cairo, Egypt , 2008 .

[18]  Esben Auken,et al.  Piecewise 1D laterally constrained inversion of resistivity data , 2005 .

[19]  R. Barker,et al.  Practical techniques for 3D resistivity surveys and data inversion1 , 1996 .

[20]  R. Barker,et al.  Rapid least-squared inversion of apparent resisitivity pseudosections by a quasi-Newton method , 1996 .

[21]  M. Goldman,et al.  On the Influence of 3-D structures in the Interpretation of transient electromagnetic sounding data , 1994 .

[22]  K. Roy,et al.  Resistivity and IP survey for delineating saline water and fresh water zones , 1980 .

[23]  F. Santos,et al.  1D joint inversion of AMT and resistivity data acquired over a graben , 1997 .

[24]  John Knight,et al.  Transient electromagnetic calculations using the Gaver-Stehfest inverse Laplace transform method , 1982 .

[25]  Fernando A. Monteiro Santos,et al.  1-D laterally constrained inversion of EM34 profiling data , 2004 .

[26]  A. Christiansen,et al.  Mutually and laterally constrained inversion of CVES and TEM data: a case study , 2007 .

[27]  H. El-Kaliouby,et al.  Comparative study of local versus global methods for 1D joint inversion of direct current resistivity and time-domain electromagnetic data , 2010 .

[28]  Olivier Maquaire,et al.  Joint Electrical and Time Domain Electromagnetism (TDEM) Data Inversion Applied to the Super Sauze Earthflow (France) , 2000 .