JOURNAL OF THE BALKAN GEOPHYSICAL SOCIETY, Vol. 2, No 2, May 1999, p. 30-45, 10 figs.

An algorithm for the 3-D inversion of tomographic resistivity

and induced polarisation data: Preliminary results

P.I. Tsourlos * and R.D. Ogilvy **

* GeoMentor e.e.i.g., Sarantaporou 8, 15342 Agia Paraskevi, Athens, Greece

**British Geological Survey, Keyworth, Nottingham NG12 5GG, UK

( Received 15 January 1998; accepted 25 August 1998 )

Abstract: An algorithm for the 3-D inversion of dc-resistivity and induced polarisation cross-borehole data is presented. The procedure is fully automated and is based on a 3-D finite element forward modelling algorithm. The inversion is achieved by a smoothness-constrained algorithm and uses sophisticated data error treatment. The features of the algorithm are presented in detail. Tests of the algorithm with synthetic data are presented as well. The preliminary results indicate that the algorithm is robust, noise insensitive and it produces good quality inversions. Further testing of the algorithm with real data is necessary in order to prove its full potential.