Synthesis of borehole geophysical data at the Underground Research Laboratory, Manitoba, Canada
A suite of borehole-geophysical logs, supported by core data, was used to describe the rock matrix and fractures in a granitic pluton near Lac du Bonnet, Manitoba, Canada. The site is being developed by Atomic Energy of Canada Limited, as an underground research laboratory to conduct geotechnical research and to validate predictive models as part of Canada's nuclear-fuel, waste-management program. However, the site is not planned to be used for waste disposal. Geophysical well logs were used to distinguish and correlate rock types and fractures between drill holes. Two significant fracture zones that are two of the major zones of ground-water movement at the site were identified by acoustic-televiewer logs. A new heat-pulse flowmeter provided repeatable measurements of very low-velocity, vertical flow in drill holes which enabled the identification of specific fractures that were transmitting water. Borehole gamma spectra showed that some fractures are enriched in uranium, and others may be depleted. This study demonstrates some of the advantages of synthesizing available borehole-geophysical logs at a site in fractured plutonic rocks and indicates how this information can contribute to an understanding of the geophysical conditions at the site.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- DOE Contract Number:
- AI02-83CH10143
- OSTI ID:
- 6707253
- Report Number(s):
- BMI/OCRD-15; ON: DE84015470
- Country of Publication:
- United States
- Language:
- English
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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580100 -- Geology & Hydrology-- (-1989)
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
AECL
BOREHOLES
CANADA
CANADIAN ORGANIZATIONS
CAVITIES
DATA
DRILL CORES
EXPERIMENTAL DATA
FAILURES
FRACTURES
GAMMA LOGGING
GAMMA SPECTRA
GEOPHYSICAL SURVEYS
GRANITES
GROUND WATER
HYDRAULIC CONDUCTIVITY
HYDROGEN COMPOUNDS
HYDROLOGY
IGNEOUS ROCKS
INFORMATION
MANITOBA
NATIONAL ORGANIZATIONS
NORTH AMERICA
NUCLEAR FACILITIES
NUMERICAL DATA
OXYGEN COMPOUNDS
PLUTONIC ROCKS
RADIOACTIVE WASTE FACILITIES
RADIOACTIVITY LOGGING
ROCKS
SITE SELECTION
SONIC LOGGING
SPECTRA
SURVEYS
UNDERGROUND FACILITIES
WATER
WELL LOGGING