Page 185 - Open-Hole Log Analysis and Formation Evaluation

170

™
If.
FIGURE
9.7
~10
SP
+
OPEN-HOLE

0004
LOGGING

MEASUREMENTS
Normal and Reverse SP Deflections.
pw
6
Gh
he§

| | |
171
a
vo
'
-
9.

In
SP
of
Ry
(no
R,,,
Rone
care
K=
and
mud
have
In
‘mud
=
THE
eg) =
press.
order
Ry
‘The
a
where
values
values
serves
Ry,
F
where
= where
known.
in
mation
drilled,
order
to
perature
SP
defined
the
-between
R,,¢
properly
SP
-K
‘chemistry
FROM
collected
of
shale
R,,
engineers
for
can
W
been
to
the
substantial
SP is
necessarily
differences.
filtrate
should
complicated
These
the
value
proximation
by
is
LOG
log
tend
R,,
development
is
can
be
THE
water
of the
usually
and
love
Tye
leads
SP
Experiments
be
for
rig
(R19
oh temperature.
to
hole
for
of
be
absence
SP
and
to
factor.
the
maintain
measured
to
reported
known
at
paths
collected,
parameter
oy Boy
Figure
x
correct.
R,,,;
By
pdrform
and
R,,
0.75
the
to
estimation
data.are
must
on
the
taken
prepared
of the
the
measured
on
in
read
R,,,
the
of
present)
9.8
the
(Rny/Ry)
the
where
mud
a
estimated
in
R,,,
19!
can
support
in
as
by
were
be
SP
take
19"
the
formation.
sort
=
sprinkle
a
-
personnel
and
A
when
Tis
be
of R,,,.
the
logic
usually
Likewise,
shows
log
in
from
daily
A
potential.
is
inspection,
which
the
8)
equation:
predominantly
samples
quantitative
weight
placing
fit
appearance
good
10.4)/7-6)
K
the
sundry
reported
using
a
millivolts
are
shortcuts
in
reported
such
resistivities
measured
based
basis
direct
entered
may
a
can
ang
on
log analysis.
of any reported value
and
heading
timea particular
circulated
not
on
and
of this
determined.
on
analysis
be
these
on
contgntion
R,, can be
A
water- -bearing
be
a
correct
log
formation
of the
for
plot.
of being
for
a
sufficiently
Kis
show
l!b/gal.
additives
the
mud
a
circulated
NaCl muds is
that
As

quote
always
sand
R,,,,
fair
this
of the
mud
daily
by Williams
found
values.
log
into
various
approximation
thick
busy.)
some
formation
can
R,,,
empirical
mud
Analysis
SP,
R,,;
manner.
and
measurement
estimated’ from “figure
is:
and
headings
estimated
the
to
is
well
as
Another
samples
if SP,
basis
be
was
constant
of
comparison
laws
the
filtrate
on
temperature
K,
chart
9.9,
as
the
estimate
a
Even

provided
are
a
given
Logging
with
heading.
in
a
sample
were
of
from
that
a
seen,
allow
if
it
some
and
system
Dunlap
and
but
not
in
representative
the
°F.
gives
drilled.
alarmingly
the
least
a
low
the
for
which
is
well
between
statistical
series
they
both
sample
value
daily
by
is clean
tem-

relationship
physical
for-
depends
R mp ate
full
However,
engineers
are
well-
of
mud
(1984),
ap-
was
not
large
always
(Mud
fraction
the
of the
in
actual
R,,
a
also
for
of
-