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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

The borehole induction system can be used in boreholes that range from 2 to 8 inches in diameter without<br />

significant borehole effects. Conductivity measurements may be acquired in both the vadose and<br />

saturated zones, in open holes or through PVC casing. Measurements may not be taken through steel or<br />

black iron casing. The maximum depth of measurement for the most induction logging systems is 650 ft<br />

(200 meters).<br />

A general procedure for the information recorded for a borehole geophysics survey will include:<br />

Record all information necessary to correctly interpret the log including:<br />

― Well identification number<br />

― Project number<br />

― Client Bit Size (or borehole diameter)<br />

― Casing size<br />

― Location of the zero-depth of the log, which may be the top of the casing, ground level, or<br />

some other specified point<br />

― Height of the top of the casing above ground level<br />

― Depth of the bottom of the casing(s)<br />

― Total depth drilled<br />

― Date of logging<br />

― Logging engineer<br />

― Logging speed<br />

― Sensitivity Range setting(s)<br />

― Calibration and standardization data<br />

― Logging tool serial numbers, and<br />

― Any additional pertinent information<br />

Record the source-to-detector distance for nuclear radiation tools and the focusing width for<br />

focused resistivity tools.<br />

In resistivity logging, sample the drill hole fluid and record its resistivity so that true<br />

resistivity for the strata can be calculated.<br />

Clearly record calibration and standardization marks on all logs to demonstrate the<br />

relationship between the log scale and standard calibration procedures.<br />

Assemble the downhole logging tool.<br />

Decontaminate logging tool and cable if necessary.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-33 April 2004

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