Evaluation of Solid Electrode Array Effects in Computerized Section Construction Procedure for Resistivity Interpretation

Abstract

The future effectiveness of the resistivity method depends upon its ability to interpret field data obtained under more complex geological structure environments, such as weathered overburden layers, vertical contacts, faults, fracturezones, deep bed rocks or host rocks, nearsurface lateral or local inhomogeneities and various topographies. Electrical solid array resistivity techniques by using hole-to-surface and cross-hole electrode configurations may be able to extract and enhance the responses (signals) due to deep or small target inhomogeneities. Recently, in geophysical prospecting, some tomographic reconstruction algorithms have been investigated. Especially, the tomographic analysis of seismic data has lately become a powerful tool for geophysical researches. In this study, the electrical solid array effects for the computerized section construction procedure have been evaluated. Investigating the solid array element effects in the initial procedure of the tomographic image reconstruction from resistivity measurements has important interpretive advantages. In this paper, some following points are discussed ; ( 1 ) Sensitivity distribution technique as an aid to investigate the characteristics of the tomography solid electrode arrays. ( 2 ) Significance of electrode-probing configuration and array combination pattern design. ( 3 ) Resistivity computerized section construction procedure by using the sensitivity distribution technique to the inverse problem. ( 4 ) An evaluation of solid electrode array effects in the resistivity computerized section construction procedure.