Geoelectrical Tomography: Model Studies Related to Nuclear Waste Site Characterizationby Thomas E. Owen, Southwest Research Inst, San Antonio, United States,
Vernon R. Sturdivant, Southwest Research Inst, San Antonio, United States,
Abstract: Borehole geoelectrical measurements offer a promising means for detecting and delineating resistivity anomalies in candidate geological formations being considered for underground storage of high-level nuclear waste. Computer model studies were performed to characterize the geoelectrical responses associated with fault and fracture structures in otherwise homogeneous host rock formations. An efficient finite difference computer model was devised to meet the critical demands necessary for accurately modeling such very thin and localized resistivity anomalies. Methods of geoelectrical data analysis were also investigated to identify appropriate approaches for reconstructing spatial images of the detected resistivity anomalies in a manner similar to computed medical x-ray tomography. The resulting image reconstruction algorithm has the advantage of robust performance using ill-conditioned field data and is relatively insensitive to geologic noise. This method of geoelectrical imaging is generally applicable to resistivity survey data acquired either on the surface, in underground mines, or in boreholes.
Subject Headings: Computer models | Model analysis | Radioactive wastes | Mathematical models | Model accuracy | Imaging techniques | Waste sites | Boring
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