Olowofela JA, Ajani OO* and Jose Arce
Over the years in both theoretical and exploration geophysics, concept of inversion of geophysical data has played an important role in the interpretation and understanding of geophysical investigation of the subsurface. This paper review the basic concepts involved in carrying out inversion on induced polarization (IP) data. The algorithm is based on the linearization of equation of IP response and the use of minimization of the corresponding objective function of the chargeability model subject to data constraints. Field example was considered where the inversion scheme was applied to measurements of chargeability in the time domain. Generated model was used to solve the resulting optimization problem defining a global objective function. Applying the algorithm, result from the application of the inversion scheme to Induced polarization data obtained from a suspected lead-zinc site in Benue state, Nigeria showed anomalous zones revealing possible mineralization having attributes of galena, sphalerite and pyrite with resistivity value range of between 100 – 300 ohm-m at an estimated depth of about 50m with an overburden thickness to the top of base-metal sulphide of about 30m.
Share this article