Page 178 - Open-Hole Log Analysis and Formation Evaluation

1
A
SP
be
On
the
165
(or
The
as
The
The
from
=
a
ments
The
shown
the
electric
SP
surface.
logging
Porosity
way
means
the
between
Figure
form
shale
THE
borehole
SP
Lithology
remained
electrode
in
CHAPTER
HISTORY
induction
QUESTION
A
“cleanest”
PEUT
in
to
continuous
log
Correlation
ever
solid
abbreviated
9.1
and
as
the
can
in
relativé Scale
log
of a
explained
OF
RECORDING
one
a
line)
tools.
#9.1
log,
use
logging
NINE
SP
mV.
be
figure
has
a
mV.
the
curve
spontaneous
of
which
made,
later
THE
shown
a
of so
THE
DC
for
shows a
For.
indication
measure
“fish,”
in
nonshale
the
9.2.
shale line to
in
SP
SP
this
and
electrode
reading
was
Notice
generalized
over
systems.
many
this
the
permeability
few
on
50
recorded
Such
number
and
potential
borehole
laterolog,
Its
LOG
that
typical
R,,and,
zones.
a
figure
making
shows
mV
potential
a
the
example,
of
SP
well
sand
SP
and
per
very
9.1,
years.
The
(SP),
section.
that
there
the
discovered
log
log,
hence,
illustration
is
line:
right,
sonic
measurement
useful
ground
vec
indications
one
SP
read
by
electrical
of
usefulness
to
no
scale
departures
a
can
log,
of
simply
division.
caused
where
electrodes
the
of
to
can
the
a
was
be
measuring
it
by
the
sand
formation
are
SP
is
the
contact
be
the
functions,
electrode,
accident.
absolute
the
soon
first
used
line
It
measurements
left
log
with
built
sidewall
water
to
is
maximum
on
scale
which
the
perturbations
from
voltage
in
in
SP
into
recording
the
recorded
realized,
core
including:
suspending
logging
a
have
to
represented
salinity
a
appeared
mV,
left
in
and
usually
gun,
base
the
quantitatively
in
in
it
earth-at
using
nearly
been
system
only

single
difference
deflection
will
takes
an
etc.
all
the
is
in
Track
line
old
has
the
a

measure-
the
millivolts,