10-10 Clastic Environments II

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Unformatted text preview: Clas%c
Deposi%onal
Environments
II
 • 
Deltas
‐
Review
 • 
Beaches
 • 
Offshore
Bars
and
Tidal
Inlets
 • 
Barrier
Islands
 • 
Submarine
Fans
 Delta
Types
‐
Review
 Construc%ve
 Lobate
 Elongate
 Tide‐dominated
 Destruc%ve
 Wave‐dominated
 http://faculty.gg.uwyo.edu/heller/Sed%20Strat%20Class/Sedstrat6/sedlect_6.htm 
 Fluvial‐Deltaic
Log
Characters
 M.H.
Rider,
1986,
The
Geological
Interpreta%on
of
Well
Logs,
Blackie‐Halsted
Press
 Delta
‐
Log

 Characteris%cs
 Brookfield, Michael,2004, Principles of Stratigraphy, p.89,. Laudon,
Robert
C.,
1996,
Petroleum
Development
Geology,
p.
185
 Effect
of
Sea
Level
Change
 •  Transgression
 –  Sea
level
rising
–
moving
inland
 –  Sediments
are
deposited
inland
from
earlier
posi%on
 –  Landward
shiS
of
deposi%onal
environments
 •  Stra%graphic
sec%on
–
clas%c
textures
fine
upward
 •  Regression
 –  Sea
level
is
falling
‐

 –  Sediments
are
deposited
seaward
from
earlier
 posi%on
 –  Seaward
shiS
of
deposi%onal
environments
 •  Stra%graphic
sec%on‐
clas%c
textures
coarsen
upward

 SCUBA
Diving
Near
Shore

 hYp://www.nvcc.edu/home/cbentley/shenandoah/transgression.jpg
 Transgression
 •
Sea
level
rises
 •
Sediment
reworked

 •
Marine
environments
 


deposited
farther
inland
 hYp://www.nvcc.edu/home/cbentley/shenandoah/transgression.jpg
 Regression
 •
Sea
level
lowers
 •
Amount
of
sediment

 



increases
 •
Land
environments
shiS

 



seaward
 •
Erosion
on
land
produces

 



unconformity
surface
 
hYp://sepmstrata.org/images/20FigForced‐Regression.gif
 Transgression
to
Regression
Couplet
 hYp://sepmstrata.org/images/12FigTransgressionRegressio.
 Transgressive
Sand
 Marine
Environments
and
SP
Logs
 M.H.
Rider,
1986,
The
Geological
Interpreta%on
of
Well
Logs,
Blackie‐Halsted
Press
 Sequences
 sepmstrata.org /.../VenezGuarLogInterp.html
 Sequences
 1.  Normal
regression
from
a
high
 sea
level
stand
 2.  Fall
in
sea
level
causes
valley
 incision
and
seaward
jump
in
 the
shoreline
with
increase
in
 sediments.
(Forced
regression)
 3.  During
early
transgression,
 delta‐plain
sediments
 accumulate
landward.
 4.  During
later
transgression,
the
 stream
valley
is
backfilled
as
a
 marine
estuary
and
parts
of
the
 older
unconformity
are
overlain
 by
a
thin
veneer
of
reworked
 transgressive
sediments
 5.  Final
panel
shows
a
hypothe%cal
 well‐log
cross
sec%on
through
 this
sequence

 hYp://www.ags.gov.ab.ca/graphics/atlas/fg25_04.jpg
 Sequences
and
SP
Logs
 M.H.
Rider,
1986,
The
Geological
Interpreta%on
of
Well
Logs,
Blackie‐Halsted
Press
 Near
Shore
Marine
Environments
 Loca%on
of:
 •
Beaches
 •
Off‐Shore
Bars
 •
Barrier
Islands
 




















Beaches
 Influenced
by:
 •
Abundance
of
Sand
 •
Long‐shore
Currents
 •
Tidal
Range
 •
Storm
Frequency
 Hydrocarbon
Reservoirs:
 •
Sand
incased
by
marine
 


shale
 hYp://0.tqn.com/d/geology/1/0/c/9/1/saf06s%nson.jpg
 S%nson
Beach,
CA
 Beaches
 sepmstrata.org /.../VenezGuarLogInterp.html

 Off‐Shore
Bars
&
Tidal
Inlets
 Transgressive

 Off‐Shore
Bars
 Transgressive
 Off‐Shore
Bars
 with
Tidal
Inlet
 Brookfield,
Michael
E.,
2004,
Principles
of
Stra%graphy,
Blackwell
Publishing,
p.
87
 Barrier
Island
–
Tidal
Inlet
‐
Shore
 hYp://www.ags.gov.ab.ca/graphics/atlas/fg16_10.
 Barrier
Islands
 hYp://www.adventurouskate.com/wp‐content/uploads/2010/07/tni‐sp‐fraser‐island.jpg
 Barrier
Islands
 hYp://www.nvcc.edu/home/cbentley/shenandoah/transgression.jpg
 Barrier
Islands
 hYp://www.geo.hunter.cuny.edu/bight/images/barrier.jpg
 Barrier
Islands
 Deep
Water
Marine
Environment
 Loca%on
of:
 •
Submarine
Canyons
 •
Submarine
Fans
 Deep
Water
Fans
 hYp://sepmstrata.org/deepwater/Co‐Clare‐Images/Clare‐Basin‐Figs‐Maps/FullSizeMaps/Ross‐Sand‐rich‐fan.gif
 Deep
Water
Submarine
Fans
 hYp://sepmstrata.org/images/Posmen%erKolla‐elementsFan.gif
 Deep
Water
Sands
and
SP
Logs
 M.H.
Rider,
1986,
The
Geological
Interpreta%on
of
Well
Logs,
Blackie‐Halsted
Press
 Log
Characters
for
Deep
Water
Fans
 hYp://sepmstrata.org/images/Posmen%erKolla‐elementsFan.gif
 Submarine
Fans
and
Canyons
 Edwards
1986:
A
reappraisal
of
deposi%onal
environment
(barrier
bar
or
submarine
fan)

 for
Lower
Wilcox
sandstones
of
Valen%ne
Field,
Lavaca
County,
Texas
Gulf
Coast.
South

 Texas
Geol.
Soc.;
Contribu%ons
to
the
Geology
of
South
Texas.
252‐259.
 hYp://www.marcedwards.com/images/publica%ons_gulf09_img.gif
 Monday
 •  Carbonate
Deposi%onal
Systems
–
I
 –  Diagene%c
Porosity
 –  Primary
and
Secondary
porosity
 –  Early
Erosion
 –  Fracture
Porosity
 ...
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This note was uploaded on 10/11/2011 for the course GEOG 3413 taught by Professor Hileman during the Fall '10 term at Oklahoma State.

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