Page 205 - Open-Hole Log Analysis and Formation Evaluation

b.
Ry
SSP
1.15
=
=
180°F
R.,=0
‘
Salinity
to
=
0.02
#9,7
#9.3

25/0.6
°F/100 ft
200,000
41.7
ppm
mv
Questions
NaCl
.
i
.
oo
, 191 to effective, it is more informative equally potassium. Since the various gamma ray sources are not all ppm uranium, 12 n ppm thorium, and 2% An average shale contains 6 MINERALS RADIOACTIVE ABUNDANCE OF NATURALLY OCCURRING” the basis for measurernent in the natural gamma spectroscopy tools. of occurrence. This is.an important concept since it is used as shows the relationsh
‘to
casing,
surface.
other
of
THE
subs
right.
in
Some
occurrence
analysis
that
of the
for
can
the
applications,
measurements
electronics
shale
in
be
each
for
can
the (uranium
defined
daughter products,
Track
be
Modern gamma
1
common
content
induced
to

and
decay
later.
ray
passing
of a
on a
sandwiched
that
tool
made
stable
the
in
RAY
tools
gamma
into
will
energy
¢horium
sizes,
sources
Gamma
linear
lead
are
is
both
rays
in
consider
not
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gamma
grid
can
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ray
ratings,
open
LOG
the
groups
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nature:
isotopes
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and
different.
and
practically any
the
form
count
of
(see
of
be discussed
cased
rate
scaled
through
Figure
ray activity increases
in

logging
in
to
(e.g.,
os
double-
the
holes,
applications
steel
and potassium.
10.3
10.1).
from
radioactive
radioactive
API,
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