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Borehole Geophysics as Applied to Geohydrology

Roger H. Morin, Project Chief

A photo of the Borehole Geophysical Logging truck

Geophysical data are recorded for water wells and test holes, but interpretation is subject to significant uncertainties. The data are used in ground-water models to evaluate potential waste disposal sites and the effects of ground-water contamination and to guide development of aquifers, including geothermal reservoirs. The development of quantitative log-interpretation techniques to derive more accurate data and to evaluate the statistical uncertainty in the data will reduce costs in ground-water investigations. Project objectives are to (1) evaluate presently available logging equipment and log-interpretation packages and develop improved instrumentation and analytical techniques for specific ground-water problems such as site selection and monitoring for disposal of radioactive, municipal , and industrial wasters; improve log derived estimates of physical properties, such as porosity values; (3) relate the log character of fractures to their hydraulic conductivities; (4) develop the capability of making quantitative interpretation of borehole gamma spectra; and (5) perform statistical analyses of the magnitude and sources of errors in log-derived data.

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Last modified: January 1, 2008
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