27 April 2000 Borehole radar measurements in complex geological structures
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Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383549
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia
Abstract
GPR borehole surveys provide important spatial data on the geological structures within mines. In this paper we want to show how the spatial relationships of complex geological structures are determined in a repository for radioactive waste in salt. Whether a discontinuity within a stratigraphic sequence can be detected depends on differences in the conductivity and permittivity of the geological units. In contrast to data treated in half-space, it is important to record and interpret the data of borehole radar measurements not only as a function of distance but also as a function of direction. The authors have developed GPR instruments and methods for interpreting directional data. Because the wave propagation velocity is known, the data can be a migrated in space by reconstructing the wave front. This allows the construction of reflection horizons that can be precisely oriented spatially. Case studies of GPR borehole measurements to locate anhydrite structures in salt mines will be used to illustrate the value of this method for efficient reconnaissance. The methods for interpreting the reflectors in terms of their geological meaning and for representing them in three-dimensions are discussed. Three-dimensional interpretation allows geologists and miners to better target their activities with greater safety.
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Dieter M Eisenburger, Dieter M Eisenburger, V. Gundelach, V. Gundelach, } "Borehole radar measurements in complex geological structures", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383549; https://doi.org/10.1117/12.383549
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