TM 5-818-1 / AFM 88-3, Chap. 7
Table 4-5. Borehole Surveying Devices-Continued
a
Device
Measurement Obtained
Primary Use
Sonic logging
(Continued)
Reflected acoustic
Locate fractures and
Imagery
energy
voids and strike
and dip of joints,
faults, bedding
planes, etc.
Fluid logging
Temperature
Temperature gradient
Determine geothermal
in borehole
gradient and defi-
nition of aquifers
Fluid resistivity
Electrical resistance of
With temperature data
borehole fluids
the determination
of dissolved
solids--locate
zones of water loss
or gain
Trace ejector
Controlled ejection of
Groundwater flow
trace elements
patterns
Fluid sampler
Borehole or formation
Uncontaminated sam-
fluid from predeter-
ples for water
minded depths
quality studies
Visual logging
Borescope
Visual image of the
Cheap, rapid examina-
sidewalls of a bore-
tion of borehole
hole to depths of 100
walls
ft or less--a peri-
scopic instrument
Borehole camera
Photograph of a 360 deg
Examination of bore-
sweep of the borehole
hole conditions,
wall taken approxi-
bedding, joints,
mately at right angles
etc.
to the wall. Expo-
sures timed so that
slight overlap of each
photograph is obtained
(Continued)
(Sheet 2 of 3)
4-14
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