Exam #2 Review-11

Exam #2 Review-11 -...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: GEOL
3413
–
Exam
#2
REVIEW
 
 Lecture
8
(9/16)
–
Well
Logs
I
 
 Slide
3
–
Be
able
to
locate
on
a
drawing
these
parts
of
a
drilling
rig:
 ‐ Crown
block
 ‐ Derrick
 ‐ Traveling
block
 ‐ Stand
pipe
and
swivel
 ‐ Kelly
 ‐ Blow
out
preventers
 ‐ Drill
pipe
 ‐ Drill
bit
 ‐ Casing
 ‐ Engines
 ‐ Mud
pit
 
 Slide
7
–
Know
the
2
primary
actions
of
Drilling
mud
 
 Slide
10
–
Know
how
the
SP
log
responds
as
mud
resistivity
changes!
 
 Slide
11
–
On
a
Gamma
Ray
log
be
able
to
pick:
 
 
 
gross
sand
thickness
and
50%
clean
sand
 
 Slide
13
–
Know
how
resistivity
devices
work
wrt
hydrocarbon
effect
on
conductivity
 
 Slide
15
–
Be
able
to
read
the
value
of
Rt
from
the
Deep
Induction
curve.
 
 
 Know
how
to
calculate
Water
saturation
using
the
Archie
Equation
 
 
 
 Given
values:
Rw
=
0.035
 
 
 


 a
=
2
 
 
 


 m
=
2
 
 
 
 
 
 Rt
=
Read
from
Deep
Induction
curve

 
 
 φ
=
calculate
from
CNL‐FDC
log
 
 
 
 
 
 Slide
15
–
Know
what
a
water
bearing
zone
looks
like
on
a
Resistivity
log
 
 Slide
16
–
Know
what
gas
and
an
oil
zones
look
like
on
a
Resistivity
log
 
 Slide
17
–
If
given
a
description
of
the
function
of
a
Sonic
Log
be
able
to
identify
it
 
 
 Page
1
 
 Slide
20
–
Know
the
response
of
a
CNL­FDC
log
to
both
gas
and
oil
 
 Be
able
to
read
a
CNL‐FDC
log
and
calculate
porosity
value
–
φ
 
 
 
 2 2 φD + φN φ= 2 
 
 Slide
21
–
Review
Log
responses
for
oil,
gas
and
wet
zones
 
 Slide
22
–
Archie
Equation
(see
above)
NOTE
porosity
is
written
as
a
decimal
not
a
%
 € 
 Slide
27
–
Know
that
a
low
permeable
zone
(e.g.
siltstone)
has
a
wide
oil­water

 
 transition
zone
 ‐ while
a
very
permeable
zone
has
a
narrow
oil­water
transition
 
 Slide
28
–
Know
the
5
uses
of
Dipmeter
Logs
 
 
 Lecture
9
(9/19)
–
Clastic
Depositional
Systems
I
 
 Slides
4
–
Be
able
to
recognize
the
SP
log
shape
of
a
fluvial
channel
 
 Slide
8
–
If
given
the
log
on
the
right
of
the
slide,
be
able
to
show
the
location
of
the
–
 
 Oil/Water
contact
 
 Slide
11
–
Recognize
the
SP
log
shape
of
Point
bars
 
 KNOW:
That
the
type
of
stratigraphic
traps
formed
by
a
meandering
river

 
 channel
are
called
“Point
Bars”
 
 Slide
14
–
KNOW:
On
a
log
cross
section
–
be
able
to
draw
in
a
Skinner
Channel
that
cuts
 through
the
Pink
limestone!
Like
on
this
slide
and
like
we
did
in
lab!
 
 Slide
16
–
Be
able
to
define
how
a
crevasse
splay
sand
occurs.
 
 Slide
20
–
know
the
4
types
of
Deltas

 
 Constructive:
Lobate
and
Elongate
 
 Destructive:
Wave­dominated
and
Tide­dominated
 
 
 KNOW:
“The
type
of
stratigraphic
trap
formed
at
the
mouth
of
a
river
where
 
 
it
dumps
sediment
into
the
ocean
is
called
a
“Delta”

 
 Lecture
10
(9/23)
–
Clastic
Depositional
Systems
II
 
 Slide
5
–
KNOW
the
characteristics
of
a
Transgressive
sequence
and
a
Regressive
sequence
 Page
2
 
 Slide
17
–
Character
of
Beaches
–
Grain
size
increases
upward
 
 Slide
18


Off‐Shore
Bars–
Grain
size
increases
upward
/
Tidal
Inlets
–
Grain
size
decreases
 upward
 
 Slide
21‐23
–
Barrier
Islands
–
grain
size
increases
upward
 
 Slide
25
–
Deep
water
Fans
below
the
edge
of
a
shelf
(just
know
that
these
exist).
 
 
 Lecture
11
(9/26)
–
Carbonate
Depositional
Systems
 
 Slide
2

‐
KNOW:
carbonate
porosity
=
secondary!

 
 ­Diagenetic
Porosity
–
most
usual
 
 ­
Fracture
Porosity
 
 Complex
history
of
closing
and
reopening
of
porosity!
 
 **
Usually
need
CORES
–
for
evaluation
of
carbonate
reservoirs
due
to
complex
 diagenetic
history.
 
 Fields
produce
from
originally
tight
carbonate
rock
that
later
developed
porosity
 due
to
ground
water
(meteoric
water)
causing
new
porosity
and
at
the
same
time
 destroying
porosity.
 
 Slides
17
and
19
–
Carbonate
rocks
can
be
prolific
producers
of
oil
and
gas.
 
 
 Lecture
12
(9/30)
–
Essential
Tools
 
 Slide
2
–
The
Present
is
the
key
to
the
Past!
 
 Slide
7
–
Carbonate
sediments
 
 KNOW:
1.
CaCO3
mud
is
called
“micrite”
 
 
 


3.
Carbonate
reefs
or
‘bioherms’
are
built
up
along
the
edge
of
a
shelf
by

 
 
 





organisms
(corals,
sponges,
other
hard‐shelled
organisms)
 
 
 

2.
DOLOSTONE
[Ca,Mg
(CO3)2]
=
the
sedimentary
rock
which
forms
when

 
 
 






magnesium‐rich
waters
circulate
through
a
limestone
and
Mg
substitutes

 
 
 






for
Ca.”
 
 Slide
9
–
Know
that
“Lithification”
is
a
combination
of
Compaction
and
Cementation
 
 Slide
10
–
KNOW
the
characteristics
of
the
cementation
process
 
 Slide
14
–
KNOW
the
6
parts
of
the

“Petroleum
System”
 
 Page
3
 Slide
15
–
KNOW
the
definition
of
‘porosity’
and
‘permeability’
 
 Slide
22
–
Know
the
purpose
of
Drilling
Mud.
 
 Slide
36
–
KNOW
what
a
Caliper
Log
is
and
what
it
measures
 
 Slide
44
–
If
you
are
given
this
correlation
diagram,
be
able
to
draw
the
channel
sand
 
 
 
­
and
show
how
it
cuts
through
the
Pink
Limestone.
 
 
 Lecture
13
(10/3)
–
Well
Logs
II
 
 Slide
2
–
Review:
Know
the
function
of
drilling
mud
and
Caliper
log
 
 Slide
3
–
KNOW
the
purpose
for
Surface
Casing,
Intermediate
Casing,
Production
 Casing
 
 Slide
5
–
Know
concepts:

 
 


1.

Hydraulic
pressure
(from
mud
in
the
hole)
must
be
greater
than
the
formation

 
 
 pressure
–
or
there
will
be
a
blow
out.
 
 


2.

If
the
hydraulic
pressure
is
much
greater
than
the
formation
pressure
–
drilling
 
 
 mud
will
damage
the
formation
 
 Slide
6
–
Know
the
3
sets
of
“Information
during
Drilling”
about
oil/gas
shows!
 
 Slide
8
–
Know
what
a
Drillstem
Test
measures
and
what
evidence
would
cause
an
 engineer
or
geologist
to
ask
to
run
one.
 
 
 Lecture
14
(10/7)
–
Reservoir
Porosity
and
Permeability
 
 Slide
3
–
Know
Definition:
Porosity
(Do
not
need
to
know
the
equations)
 
 Slide
4
–
Know
Definition:
Effective
Porosity
 
 Slide
5
–
Know
Definition:
Wettability
 
 Slide
7
–
Know
that:
Most
reservoir
rocks
are
water
wet
 
 Slide
8
–
Know
definition:
Irreducible
(Oil/Water)
 
 Slide
9
–
Know
definition:
Residual
(Oil
or
Gas)
 
 Slide
10
–
Know
definition:
Recovery
Efficiency
(RE)
 
 Slide
11
–
Know
definition:
Permeability
(k)
 Page
4
 
 Slide
12
–
Be
familiar
with
the
Equation
for
Darcy’s
Law
–
flow
rate
through
porous
media
 
 Slide
14
–
Know
definition:
Radial
flow
(Kh
=
permeability
x
thickness)
 
 Slide
15
–
Know
definition:
Relative
permeability
(kr)
 
 Slide
16
–
Know
definition:
Effective
permeability
(ke)
 
 Slide
18
&
19
–
Know
relative
permeability
in
water
wet
system
relate
to
Sw
values!!
 
 
 ko
=
permeability
to
oil!
 
 
 kw
=
permeability
to
water!
 
 Slide
20
&
21
–
Know
5
“Ways
to
Move
Oil”
 
 Slide
21
–
22
‐
23
–
Know:
Stages
of
Migration
from
Source
to
Reservoir
and
trap
 
 
 Lecture
15
(10/10)
–
Structural
Geology
 
 Slide
3
–
Know
the
3
types
of
Stress
 
 
 Compression
–
shortens
the
rock
body
horizontally
and
thickens
vertically
 
 
 Tension
–
lengthens
the
rock
body
horizontally
and
thins
vertically
 
 
 Shear
Stress
–
slippage
along
fault
zone
–
thickness
stays
the
same
 
 Slide
6
–
Know
parts
of
a
fold:
Limbs,
Axis,
Axial
plane,
Plunge
 
 Slide
7
–
Anticline
(arches
upwards
–
good
traps)

 
 


Syncline
(bows
downwards
–
no
traps)
 
 Slide
8
–
Know:
Symmetrical,
asymmetrical
and
overturned
folds
 
 Slide
9
–
Know:
the
difference
between
a
plunging
anticline
and
a
plunging
syncline
 
 Slide
13
–
Know:
Fault
Types:
Normal,
Reverse,
Strike­slip
 
 Slide
15
–
Know:
Normal
Fault
 
 Slide
17
–
Know:
Reverse
Fault
 
 Slide
18
–
Know
definition
of
Thrust
Fault
 
 Slide
19
–
Know:
Strike‐slip
Fault
 
 Slide
22
–
Know
5
types
of
Oil
and
Gas
Traps
 
 Page
5
 Slide
26
&
27
–
Know:
Combination
Trap
=
structural
nose
and
pinch
out
or
sealing
 fault
 
 Slide
31
–
Know:

 
 
 1.
Definition
of
“Throw”
and
“Heave”
 
 
 2.
With
a
Normal
fault
–
the
stratigraphic
section
may
be
missing
in
the
 
 
 




well
bore
 
 Slide
33
–
Know:
Growth
Fault
 
 Slide
35
–
Know
that
with
Reverse
fault
–
the
stratigraphic
section
is
repeated
in
the

 
 
 well
bore
 
 Slide
42
–
Know:
Salt
Domes:
Found
in
Gulf
of
Mexico
where
less
dense
salt
rises

 
 
 
 plastically
to
deform
the
overlying
beds
and
trap
oil
and
gas
 
 
 Page
6
 ...
View Full Document

This note was uploaded on 12/15/2011 for the course GEOL 3413 taught by Professor Hileman during the Fall '11 term at Oklahoma State.

Ask a homework question - tutors are online