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Borehole logging from 0-2000m
Terratec offers the following
borehole geophysical measurements:
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Optical borehole scanner (OPTV) |
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Acoustic televiewer (BHTV) |
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Flow meter (Fluid logging) |
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Wire line water sampling at
particular depth |
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Fluid temperature |
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Fluid conductivity |
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Caliper |
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Natural gamma ray (total
count) |
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Spectral gamma |
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Sonic (FWS, CBL) |
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Borehole deviation (magnetic
and gyro) |
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Total magnetic field (Hx, Hy,
Hz) |
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Resistivity and IP |
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Dual induction rock
conductivity |
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Borehole EM (Geonics
BH43-3B) |
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Density (gamma-gamma) |
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Porosity (neutron)
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Others on request.... |
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Televiewer with structural data |
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Flowmeter |
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Detection of depth, volume and direction of
water in- or (out-) flows
The fluid is speed is measured by an
impeller of which rotation speed and
direction is recorded.
The
size of the impeller has to fit with the
borehole diameter and should not be to small
compared with the borehole diameter; Type of
sensor /optical or magnetic (magnetic
particles etc….) |
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Tracer Fluid Logging |
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Up and down run with a salt basket
for tracer |
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Cond. Temp log to determine natural
flow through the borehole |
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Pumping with very low rates <
0,1l/sec and several Cond runs over
hours by recording the time of each
run to see the fresh water coming
into the borehole |
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Water inflow of several liters over
hours can be detected ! |
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Acoustic Scanner (BHTV) |
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If there is no visibility in the
borehole the optical scanner can be
replaced by the acoustic scanner
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Visualization the interior of the
borehole by using a rotating
ultra-sonic transceiver system
Amplitude and travel time are
measured |
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The amplitude values depends on the
acoustical hardness of the rocks
(bright yellow = hard) |
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The acoustic scanner can see only
open structures and differences in
the acoustic hardness of the rocks |
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A multi-arm oriented caliper can be
calculated by knowing the fluid
velocity |
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The structural evaluation is done
similar to the optical scanner using
the same software tools |
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One tool = oriented structures+
magnetic deviation oriented multiarm
caliper |
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