Page 168 - Open-Hole Log Analysis and Formation Evaluation

is
to
TST
the
TST
and
well
AB,
enters
the
=
=
vertical
Figure
Figure
demands
thickness
thickness
measured
the
and
MT
MT
enters
greater
is
8.5
problem
8.4
the
can
bed
in
cos
is
cos
AB
the
measured
at
crossing
be
B.
of both
a.
true
a
A
thickness
and
other
bed
finds
the
less
illustrates
and
it
evident,
at
MT
illustrates
A
thickness
cases.
the
than
the
the
and a
horizontal
by
leaves
and
true
stratigraphic
difficult
case
dipping
the
same
case
A need
bed
A
B°
explorationist
of a
ao
of
of
for
bed
leaves
a
type
a
vertical
and
at
from
thickness
method will
deduce
of
the
to
B,
is
bed
the
straight
the
well
be
the
bed
measured
Horizontal
to
given
quick and
hole
at
theltrue stratigraphic thickness
a
Bed
problem.
by
B,
legitimate
thickness
engineer.
deviated
trace
presented
horizontal.
in
simple
a
(TST)
the
measured
thickness
«°
to
crossing
If
is
a
whether variations
MT.
some
the
Measured
froin
bed
solution
(8.2)
hole
(8.1)
thickness
of
measured
related
If the
cases
bed
to
the
satisfy the
thickness
bed

_ with is faced reserves to compute The engineer trying is likewise and bed-dip effects. hole deviation from distortions resulting horizontal, the well azimuth geometrical -is:immaterial and that where the bed is or whether they are variations bed due from a log are thickness measured bed in to field across the given tries geologist who th
In
8.6)
true
bed
TST
note
Note
Note
For
where
the
=
_
seeking
bed-dip
crossing
and
azimuth,
Figure
azimuth,
that
the
that
that
a
AC
illustrated
it
MT
‘illustration.
the
8.6
vertical
TST
azimuth
in
=
is
and
not
TST
a
bed
general
cos
cos B
where
true
AB
azimuth
the
and
the,true
(a
Again,
figure
the
equations
cos
trivial
+
case,
case where
the
and
the
(distance
8.6
illustrates
thickness
a.
dipping
required
B),
simple
well
the
vertical
(8.3)
do
well
BD
B°
is
the
for
in
stratigraphic
exercise
not
(TVT)
well
both well
and
case
to
from
depth
measured
However,
of
azimuth
vertical,
hold.
figure
the
a
well-deviation
_ MTcos(a+ B)
given
the
relationships
calculating
thickness
are
and bed
the
azimuth
8.6).
by
well
2...
is
thickness
TST.
dip
the
difference
deduce TVT
given
is
AE,
azimuth
are
engineer
(8.4) h6ld’only
horizontal.
deduced
azimuth
by
same
AB.
are
is
and
Dipping
deviated
for
for
It
BD.
different
for
between
Note
is
«°
Bed
of the
the
the
A
the
oriented
of
this
exactly
(distance AE
that
in
from
and
from

case
interested
on
the
B
the
the
unique
dipping
both
in
is
geologist
interest
is
AC
to
the
particular
same
case
figure
same.
vertical
the
bed
where
bed
(8.4)
(8.3)