Page 201 - Open-Hole Log Analysis and Formation Evaluation

.
-
-
.
.
A
to
SP
In
SP
can
and
and
have
parts
areas.
to the
Some
(V4)
value
Quite
ocean
winch
These
sand B
(Vi)sp
be
(Vase
poor
column
placing
useless.
Cyclical
As
Baseline
detected
by
incorrect
_—
sand and
Although
could
illustrates
—
=
problems.
to
are
QUESTION
tools
of the
or
Sometimes

the
in
acts
bronze,
?
floor
drum
of the
the
cured
SP
depositional
cementation
QUALITY
different
galvanometer
figure 9.19,
SP
as
shifts
the
or
#9.9
for
the
ground
SP
SP,hate
the tool
some
show
SP
depositional
SP shale
~
logs
is
can
sonde.
~
where
carrying
DEPOSITIONAL
can
may
determine
variously
change
field.
connections
saw-tooth
itself
ground
are
SP
be
i
polarity
aa
as
in
of these
the
SPrna
SP
CONTROL
relationship
a
sequences,
example)
changes.
SPeand
by wrapping
with
cause
become
an
connections.
left by an amount that,
.
could
intermittent
A
currents
in
i
'
In
prone
of the
electrochemical
referred
shale
the
SP
be
PATTERNS
to
quite
can
SP
If the
profiles
depth,
patterns.
electrodes
to
SP
where
converted
close
is
the
SP
typically,
raised up the hole,
as
insulating
circuit
can
drag
is
extraneous
into
is the value observed ina
have
content.
errors,
the
particular,
it
a
apart from water salinity variations,
mud pit whose
tape
either
cause.
potentials,
bells
produce
baseline
moves
two
reversed
Find
assume sand is clean and wet.
pronounced
the
proximity.
or
a small battery. This condition is
to
back
these
in

level
shale,
value
indicate
over
as
contacts.
in
potential
is
a
a
A
the
for
and
the
channels,
sorting,
Since
move.
errors
log
known

some
dissimilar
the
interface
funnels.
result
added
as
the
forth
characteristic
bars,
wrong
For
can
grain
to
changing
of
via
two
SP
shale
of this
or
can
metals
offending
magnetized
the
and
the
Figure
on
size,
easily
type
SP.
Use the SP deflection
caus
direction,
a few millivolts per thousand
metals
geographical
SP baseline will gently shift
metal
bimetalism
It
incorrect
is
(steel
the
mud
example,
shapes.
cable
be
SP deflections also respond
other
or
9.20
in

volume
then any intermediate

187
. 9. THE SP LOG MEASUREMENTS UL. OPEN-HOLE LOGGING 1 & 6
FIGURE
9.19
Estimation
of Vy from
SP.