Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations
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United States of America Patent
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Feb 13, 1990
Issued Date -
N/A
app pub date -
May 31, 1988
filing date -
Apr 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to the measurement of the longitudinal components of low frequency A.C. magnetic fields from within cased boreholes which are used to measure the geophysical properties of geological formations. The applied A.C. magnetic fields are generated by passing low frequency A.C. current through insulated wires or by conducting low frequency A.C. current through geological formations. The currents generating the applied A.C. magnetic fields are in the frequency range between 0.001 Hz and 20 Hz. The measured longitudinal components of the resulting total A.C. magnetic fields are responsive to various geophysical parameters which include the resistivities of the portions of the geological formations subject to said applied A.C. magnetic fields.
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