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Estimating Geohydrologic Properties from Borehole-Geophysical Logs |
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| Authors: | Donald G Jorgensen |
| Institution: | Donald Jorgensen, CGWP, is a hydrologist for the U.S. Geological Survey (National Drilling Co., U.S. Geological Survey, Ground Water Research Project, P.O. Box 15287, Al Ain UAE). Currently, he is project manager of the National Drilling Company-U.S. Geological Survey Ground Water Research Project for the Emirate of Abu Dhabi. Jorgensen has been a member of the Association of Ground Water Scientists and Engineers board of directors since 1987 and is the author of more than 40 publications in the fields of ground water research, ground water resource investigations, and ground water contamination investigations. |
| Abstract: | Borehole-geophysical logs can be used to estimate geohydrologic properties based on in situ measurement of rock and water properties. Estimates of properties of both formation and water, such as coefficient of diffusion, formation factor, cementation exponent, hydraulic conductivity, irreducible water content and specific yield can be assessed from borehole-geophysical data and selected algorithms and graphs. Water properties, such as resistivity, sodium chloride concentration, viscosity and density, can also be estimated using data from borehole-geophysical logs. Water resistivity using the spontaneous-potential method can be estimated if an empirical correction for fresh water is applied. Estimates of formation properties, such as porosity and permeability, can also be made using borehole-geophysical data. |
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