Page 170 - Open-Hole Log Analysis and Formation Evaluation

a
to
the
dip
the
and
back
ships
until
An
idea
using
well)
bed).
the
to
it
is
The
values,
stereo
placing
azimuth
Either
If
the
same
same
to
increased
structural
in
was
transverses
understand
the
stuck
the
dip
perform a
the
of the
time,
subtraction.
meter-related
angle
illustrated
the
the
net with
cosine
alternative
of these
to
a
horizontal
horizontal
dip
in
consider.
practicing
cheese
vertical,
The
law
cheese
through
orientation
(or
pencil
and
of dip
in
is
a
log
cheese
to
the
on a
subtraction
principle
rotating
figures
the
rotations
increase
problems
approach
from
the well
rotation.
geographical
slab
relative
by
which
the
and
8.4
as
hole
can
In
some
will
well
to
of
west
initially
analyst
of spherical
the
be
deviated
manipulation
would
overlay,
one
case
and
to
frame
this
the

back

or
to
point
horizontal
be
can
of
dip
8.5
who
the
it
bed
cheese
made
imagining
deviation
to
be
the
deviation
dipping
west
a
solution
triangles.
can
can
by
has
appreciate
, 1979, and Konen SPWLA from Bateman of the Deviated Well and Dipping Bed. Reprinted by permission FIGURE 8.6 Wellbore \ Deviated OF RESULTS. AND APPLICATION OF ANALYSIS I. METHODS 1D0
method
to
vector
itself.
surface
be
and
be
cheese
of the
allow
made
somewhere
the
to vertical),
the
west,
had
reference,
Once
and
pencil
The
will
the
slab
of north.
the
treating
to
north
used.
bed
described
the
the
north
it
pencil
then
be
is
(representing
azimuth
while
as
and
to
deal
reader
bed
a
the
would
pencil
simple
Since
here.
similarity
from
the
bed.as
the
of west
to
dip
the
The
brought
with
assume
:
move
(representing
at
result
and,
vertical.
is.rotated
new
relation-
an
structural
graphically by using
made mathematically
rotate
dipping
the
pencil
at
back
between
basic
another
new
dip-
maintaining
of
may better
the
c.
a.
d.
b.
is
ee
to
or
or
cos
tor
TST
TST
and
TST
Bed
Top
Qo
TVT
then
TVD
Well
Find
If the
given
From
a’
= | DAZ 5 HAZ? B a horizontal. For which needed azimuth 157 8. RESERVE
is
=
=
i well II the approach is the of the
=
is
Bottom
the
=
=
the
by
bed
=
the
bed
Measured
QUESTION
MT
MT
MT
=
of bed.
of bed.
true
is
dip
horizontal
cos
bed
log
well
‘COS
hole
of bed
#8.3
dipping
difference
ist
deviated
a
a’
| 25° 30° to azimuth =! 5878 ft 5642 the following data [cos a - sin @ tan B B vertical [cos cos now- horizontal, the @ COS B - sin w sin is deviation from measured bed thickness, azimuth, and azimuth, dip from horizontal, deviation from Thus, if purposes is new bed dip or the bed or the hole ESTIMATION
ft
thickness.
given
to
cos
of
used.
by
B
between
-
"
a’,
top
sin
thickness
azimuth
a
and
-
45°
where
illustration,
sin
cos
are
of the
128°
B
bed
bottom
cos
(HAZ
-
will
is
collected:
a true stratigraphic bed thickness is B cos (HAZ - DAZ), (8.5) bed has been rotated vertical after the vertical, a we new hole deviation, depending on is not required, the only parameter .
(HAZ
of bed.
-
given
rotate
DAZ)).
by
the
DAZ)|
bed
back
\
to
(8.9)
(8.6)
(8.7)
(8.8)

|