Feasibility of detecting artificial magnetic anomalies in hydrofractured rock by super-conducting gradiometer-SQUID systems
A study of the signal physics of magnetic anomaly detection by superconducting gradiometer-SQUID systems to determine the feasibility of possible applications to the geothermal energy program is described. The system would make full use of the incredible sensitivity of the superconducting quantum interference device (SQUID) which can be in the range of 10/sup 11/ Oe. In addition to magnetic anomalies in the earth's field produced by spherical distributions of magnetic matter, anomalies that would be artificially produced by flooding magnetic material into cracks produced by hydrofracturing in deep boreholes drilled into dry rock geothermal sources are considered. The study indicates that surface detection by horizontal and vertical gradiometers of crack anomalies will not be feasible if the magnetic material flooding the crack is a paramagnetic solution. However, one can concoct a slurry to carry prepolarized ferromagnetic particles of a size sufficiently large to permit domain formation but small enough to permit rotation and alignment in the earth's field.
- OSTI ID:
- 6666000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MAGNETIC ANALYZERS
DESIGN
SQUID DEVICES
RESERVOIR ROCK
MAGNETIC SURVEYS
GEOTHERMAL EXPLORATION
HYDRAULIC FRACTURING
BEAM ANALYZERS
COMMINUTION
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPLORATION
FLUXMETERS
FRACTURING
GEOPHYSICAL SURVEYS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
SUPERCONDUCTING DEVICES
SURVEYS
150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys