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Advances in borehole geophysics for hydrology

Philip H. Nelson
Advances in borehole geophysics for hydrology (in Recent trends in hydrogeology, T. N. Narasimhan (editor))
Special Paper - Geological Society of America (1982) (189): 207-219


Borehole geophysical methods provide vital subsurface information on rock properties, fluid movement, and the condition of engineered borehole structures. Within the first category, salient advances include the continuing improvement of the borehole televiewer, refinement of the electrical conductivity dipmeter for fracture characterization, and the development of a gigahertz-frequency electromagnetic propagation tool for water saturation measurements. The exploration of the rock mass between boreholes remains a challenging problem with high potential; promising methods are now incorporating high-density spatial sampling and sophisticated data processing. Flow-rate measurement methods appear adequate for all but low-flow situations. At low rates the tagging method seems the most attractive. The current exploitation of neutron-activation techniques for tagging means that the wellbore fluid itself is tagged, thereby eliminating the mixing of an alien fluid into the wellbore. Another method uses the acoustic noise generated by flow through constrictions in and behind casing to detect and locate flaws in the production system. With the advent of field-recorded digital data, the interpretation of logs from sedimentary sequences is now reaching a sophisticated level with the aid of computer processing and the application of statistical methods. Lagging behind are interpretive schemes for the low-porosity, fracture-controlled igneous and metamorphic rocks encountered in geothermal reservoirs and in potential waste-storage sites. Progress is being made on the general problem of fracture detection by use of electrical and acoustical techniques, but the reliable definition of permeability continues to be an elusive goal.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Issue: 189
Title: Advances in borehole geophysics for hydrology
Title: Recent trends in hydrogeology
Author(s): Nelson, Philip H.
Author(s): Narasimhan, T. N.editor
Affiliation: Lawrence Berkeley Lab., Berkeley, CA, United States
Affiliation: Lawerence Berkeley Lab., Berkeley, CA, United States
Pages: 207-219
Published: 1982
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Meeting name: Recent trends in hydrogeology
Meeting location: Berkeley, CA, USA, United States
Meeting date: 19790208Feb. 8-9, 1979
References: 33
Accession Number: 1982-063256
Categories: Hydrogeology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1982
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