Page 194 - Open-Hole Log Analysis and Formation Evaluation

: it “| handle This " can formation, pee 4. the SP. water-bearing sands saturation 3. Hydrocarbon the permits the formation shaliness to be formations will 2. Shaly no SP the mud column, 1. Inoil- based muds: readings need careful (1977) is reproduced process, interpretation as actual resistivity of formation water from In order to place in perspective the b. Esti

5.
In
SP
the
a
Use
except
kinetic
hard
6:
Readings
same
shape
in
“road
FACTORS
measured.
figure
calculator
effect
currents
SP.)
resistivities
Unbalanced
or
is
the
water
#9.6
9.12
of the
largely confined
map.”
affect
Ae aon?
There
to
mud
SP
to
formations:
flowing
figure
For
the
connate
cause
the
are,
AFFECTING
we
noticeable
quantitatively.
from
to :
salinity is
of spontaneous
convert
those
Owing
here
in
water
reduce
should
the
will
be
THE
Rng
to
columns,
will
as
this
shale
w
toa
tO
(This
be
be
SP
handling.
curve. This is
borehole
to
flow
however,
permeable zones
the
distribution
Ry
available
bed
potential
with
salinity
inclined
an
Resistivities may
figure
reduce
depleted
for
Sh,
0.0083 _al
be
chart
SP.
selected
of the
complete
from
some
Pp
_at_a
9.15.
between
and in
toward
in step
SP
for
generated in
phenomenon
“streaming” potentials
illustrated in
R,, value:
from
Sh,
3.
toward
are usually
the
meast{
figure
the SP,
:
differential
measured_SP:
reservoirs.
is
determined
that
and

a legitimate
lack of an
R,.
figure
9.11.
1
currents
Figure
P,
This
oil-based
shales.
There
called
Bateman
r R, is a simple matter of reversing 8 to Ry, Rye te Temperature Formation ‘Estimate 9.13. a find Rupe! Ruve = 3.84, Log Heading Read 181 MEASUREMENTS
tirethents:
circumstances
‘formation tem
permeable
is
9.16,
and,
accurately
9.12
pressure
ifa clean
figure 9.14
mechanization
using
the
is
augment
eee
is
and
no
muds.
because
bed
and
the steps used for calculation
These
R,, determination
Thus,
into
comparison.
the
where
where
P,
of the
temperature
way
used.
either
of the
the
sand with
high
to
from
therefore,
SP:
the
very. high i in hard formations,
are
electro-
phenomenon
of the

only
offered
Konen
electrical path: in
log
easily
SP
the

‘of

Find
to
Convert
Rue to
Roy at
Temperature
Rinfe
Formation

Read SP
Ry
Rm

SP

FIGURE

R mfe

9.14

Tees
Them

Quick-Look

Guide

a
to

Rmf 7 Ruf 9. THE SP LOG
7
Rue
R,, from

the
Jf

na

SP.

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