Page 197 - Open-Hole Log Analysis and Formation Evaluation

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- than others. It is corrections charts have would the in involved the In dramatically. disturbing factors: 1977. and Konen permission of the SPWLA from Bateman by hole for R, from the SP. Reprinted resistivity, Ry; FIGURE 9.15 Logic Flow Diagram thickness; . Bed by with accuracy shale line). interval permeable succession Te+7 Rw form * 8 Rwos. permeable o
-
per
THE
SP
foot
SP
possible
does
LOG
will
SP
be
had
not
formations,
variables
SP
use
if all

SP
fully
the
diameter
(with
constant
reduction.
virtually
of the
Log
beds
current
of the
The boundaries
In
hole
Representation
the
current
(impervious
or
and
in
involved in
SP
Formation
diameter,
of
and
develop.
the
disturbing
in
can
Schlumberger

the

the
db;
(very
(comparatively
formation
of invasion;
SP
are available in the
impossible
Representation
shales,
concave

diameter
making
in
leave
to
and
high
is
highly
of
of SP

and
thin beds, where R,o/R, is
side
or
curve
this
influences
borehole
Ryy/R,,
of straight portions with a change
the
comparatively
Schematic
mud
conductive)
the
Well Services.
in

literature,
high
will
include
SP
resistive
enter
necessary
SP
were
resistivity)
Currents
constant,
tatio;
be
terminology;tised
on
this
interval.
in

a
the
of slope
the
observed SP deflection on the log and’SSP (static SP)
conductive)
curve
one

here,

Distribution

Figure’ 9:17 "illustrates

mh
of the SP curve
SP
removed.
interval
and invasion
will
of the permeable beds cannot be
straight
the
resistivity, R,,,
formations.
corrections.
chart
acighboring
opposite
borehole
potential
all
toward
Accordingly,
are
Many
refers
line.
to the value
show
Highly Resistive
shale
all
Figure
In
located
the
a
drop
to
factors
some more complex
it
SP
the
is deep,
remains
the
Bed thickness can affect the SP measurement quite

only
every