Sedimentology application in petroleum industry
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Transcript of Sedimentology application in petroleum industry
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SEDIMENTOLOGYAPPLICATION IN PETROLEUM INDUSTRY
Sedimentologist (Geologist)
Practical Use and Reference
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CONTENT
1. INTRODUCTION TO SEDIMENTOLOGY
2. HYDRODYNAMICS: SEDIMENT TRANSPORT
3. SEDIMENTARY STRUCTURE
4. FLUVIAL DELTAIC SEDIMENTATION
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1. INTRODUCTION TO SEDIMENTOLOGY
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Sedimentology :
Sedimentary rocks :
Rocks that are resulted from weathering, erosion, transportation, deposition, and diagenesis/lithification processes
Weathering/erosion
Transportation
Deposition
Sedimentary Rocks
Lithification/diagenesis
one of the branches of geology that deals specifically withsedimentary rocks or studies sedimentary rocks / sedimentswith all its processes
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Depositional environments on the earth surface control how sediment is transported and deposited.
Continental
Environment
Shoreline
Environment
Marine
Environment
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SEDIMENTOLOGY APPLICATION IN OIL AND GAS EXPLORATIONDepositional Environment
Depositional environment sediment body geometry reservoir heterogeneity petrophysics exploration and production strategy
sand isopach map of different delta types (Coleman and Wright, 1975)
T I D E S
bars
channels
MIXEDTIDE WAVE
FLUVIAL
W A V E
FLUVIAL
W A V E
W A V ET I D E S
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Depositional environment tends to become a template, no respect on processes-response analyses mis-interpretation
failure in exploration and production strategy
Typical Log Characters of Major Depositional Environment
SEDIMENTOLOGY APPLICATION IN OIL AND GAS EXPLORATIONDepositional Environment
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weathering and erosion processes provenance climate & tectonic setting basin history structural styles petroleum system analyses
exploration and production strategy
Provenance analyses from QFL triangular diagram (Dickinson, 1985)
SEDIMENTOLOGY APPLICATION IN OIL AND GAS EXPLORATIONWeathering and Erosion Processes
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transportation processes hydrodynamics forward prediction of texture reservoir quality & distribution exploration and production strategy
II
IIII
IIIIII
IVIV
Rel. ConcentrationVelocity in cm/sec
SUSPENDED L
OAD
SUSPENDED L
OAD
NO TRANSPORTATION
NO TRANSPORTATION
BED LOAD TRANSPORTATION
BED LOAD TRANSPORTATION
TRANSPO
RTATIO
N
TRANSPO
RTATIO
N
Critical
erosio
n velocity
Cessatio
n of movem
ent
400
200
100
60
40
20
10
6
4
0.0
02
0.0
04
0.0
06
0.0
1
0.0
2
0.0
6
0.0
4
0.1
0.2
0.4 0.6 1.0
2.0
4.0
6.0
10.0
20.0
0.0010.010.10.50.9
Rel. Concentration Grain diameter in mm (and )o
(8.0) (7.0) (6.0) (5.0) (4.0) (3.0) (2.0) (1.0) (0.0) (-1.0) (-2.0) (-3.0) (-4.0)
II
IIII
IIIIII
IVIV
Rel. ConcentrationVelocity in cm/sec
SUSPENDED L
OAD
SUSPENDED L
OAD
NO TRANSPORTATION
NO TRANSPORTATION
BED LOAD TRANSPORTATION
BED LOAD TRANSPORTATION
TRANSPO
RTATIO
N
TRANSPO
RTATIO
N
Critical
erosio
n velocity
Cessatio
n of movem
ent
400
200
100
60
40
20
10
6
4
0.0
02
0.0
04
0.0
06
0.0
1
0.0
2
0.0
6
0.0
4
0.1
0.2
0.4 0.6 1.0
2.0
4.0
6.0
10.0
20.0
0.0010.010.10.50.9
Rel. Concentration Grain diameter in mm (and )o
(8.0) (7.0) (6.0) (5.0) (4.0) (3.0) (2.0) (1.0) (0.0) (-1.0) (-2.0) (-3.0) (-4.0)
The diagram is showing relationship between flow velocity, grain size, and state ofsediment movement for uniform material of density 2.56 (quartz and feldspar). (AfterSundborg, 1967; in Reineck & Singh, 1980).
SEDIMENTOLOGY APPLICATION IN OIL AND GAS EXPLORATIONTransportation Processes
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Diagenesis / lithification processes basin fluid-flow & burial history petroleum system analyses exploration and production strategy
Diagenetic and enviromentally significant fluid/rock interactions within the principal hyrologicregimes in an actively filling sedimentary basin (Harrison, 1989 in Galloway, 1984)
Sea Level
COMPACTIONALHYDROSTATIC
COMPACTIONALGEOPRESSURED
THERMOBARIC
METEORICREGIME
- Dehydration reactions- Smectite diagenesis- Ferroan carboates- Input of basement-
derived fluids- Transition to
metamorphism
- Burial diagenesis- Quartz cement- Albitization of feldspar
calcite, kaolinite- Reactions associated
with hydrocarbonmaturation, migration
- Early diagenesis- Unconformity
diagenesis- Dissolution of Mg-
calcite, aragonitefeldspar, chert
- Precipitation ofkaolinite, calcite,smectite
Disposal ofcontaminants,
mine waste, nuclearwaster, etc
Deep well injectionof brines
Deepest wells (7 km)produce; origin ofsome ore-forming
fluids
9
8
7
6
5
4
3
2
1
Dep
th (k
m)
SEDIMENTOLOGY APPLICATION IN OIL AND GAS EXPLORATIONDiagenesis / Lithification
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Practical Flaws (1):
Coarsening upward sequence = a bar or even a delta
Barren sequence = fluvial deposit
Channel-like feature = distributary channel
Deltaic sands = channel/bars in delta-plain and/or delta-front
Coal = delta
Mahakam Delta = model for all Indonesian deltas
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Practical Flaws (2):
Burrows/bioturbation = marine deposit
Type of delta inferred from 2-D data
Cross-bedding = channel
Depositional environment = template
No respect to process-response analyses
Vertical thinking
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2. HYDRODYNAMICS: Sediment transport
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Sediment transport type
Gravity Flow
Traction current
Turbidity current
Upper Flow Regime
Debris flow or mass flow
Lower Flow Regime
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Water surface
Stream bed
AWater surface
Stream bed
BWater surface
Stream bed
C
Schematic representation of laminar vs. turbulent fluid flow:
A. Laminar flow over a smooth stream bed.
B. Laminar flow over a spherical particle on a smooth bed.
C. Turbulent flow over a smooth bed. The arrows indicate flow
paths of the fluid
(Boggs, 1995)
TYPE OF FLOW: LAMINAR VS TURBULENT FLOW
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TRACTION CURRENT
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Traction Current
Character: the movement of water which cause the sediments to be carried at the bottom of the water.
Traction current clear water, only shear stress between H20 molecules so moving the sands below it.
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TRANSPORTATION
Traction CurrentHjulstrom Diagram
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Diagram of Median fall diameter-Stream Power T.V (Harms et al, 1982)
Chutes & pools
= sand waves
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Traction CurrentBedforms – Ripple / Dune Terminology
Flow direction
Internal character of ripples. Note dominance of forset over single bottom set
laminae and a stoss side laminae
15o
34o
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Bottom set
Fore set cose
t
Co
mp
osite
set
Traction CurrentCross Terminology
cose
t
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Ripple cross-lamination from Bayah Formation (Cihara Beach)
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Traction CurrentBedforms – Antidune Genetic
A
B
C
Water surface
Water surface
Water surface
Scheme showing three modes of deposition in antidunes.
A. Poorly defined low-angled laminae on the down-stream slope;
B. Lamine draping over the complete antidune;
C. low-angled inclined laminae, dipping upstream. Type C is most common & originates when antidunesmove upstream & break. (Kennedy, 1961)
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Traction CurrentBedforms – Parallel Structure
Bayah Formation, Cihara Beach
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GRAVITY FLOW
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Gravity Flow
Gravity flow is another type of sediment which due primarily to the difference in density between water with suspended sediments and clear water outside the suspension.
It can take place in otherwise still water.
The water contain suspended grains grains move with water and deposited
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Turbidity current: sediment which is carried in suspension by turbulent current is borne out onto a slope gain a gravitational component become suspension is heavier than the surrounding clear water turn into a density current (turbidity current)
Turbidity current consist of suspensions of sediment in water.
Gravity FlowTurbidity current
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Gravity FlowTurbidity current
Postulated structure of head & body of a turbidity current advancing into deep water. The tail is not shown. (After Allen, J.R.L., 1985)
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Gravity FlowSubmarine Canyons & Deep Sea Fans
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Gravity FlowWalker’s Model
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Grain
Size
Fines
up
Gravity FlowBouma Sequence: Graded Beds
Scour base
TR
AC
TIO
N
CU
RR
EN
T !
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3. SEDIMENTARY STRUCTURES
A key to the interpretation of the “Depositional Setting” of sedimentary rocks
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SEDIMENTARY STRUCTURESPrimary Bedforms (formed DURING deposition)
2A-Flute casts2B-Tool Marks
Groove castsProd marks, bounce marksChevron marks
2. Erosion Structures on the UNDER side of beds (sole markings)
3A-Rill marks3B-Wind erosion3C-Raindrop imprints
3. Erosion Structures on the UPPER side of beds (sole markings)
1A-Plane Beds1B-Ripples
1C-Dunes
1D
Planar laminationsRipples cross-lamination &Small-scale cross-laminationLarge-scale cross-stratifications (cross bedding)Graded Bedding
1. Internal Structures
After Bjorlykke (1984)
• Swaley & Hummocky
• Herringbone
• Flaser-wavy-lenticular
• Symmetric & Asymmetric Ripple
• convolute
Variant :
Bed form
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SEDIMENTARY STRUCTURESSecondary Bedforms (formed AFTER deposition)
4A Dish structures (immediately after deposition)
4B Sandstone dykes4C Sand volcanoes
4. Water Escape
6A-Dessication mudcraks6B-Shrinkage cracks, synaeresis6C-Frost cracks (polygons)
6. Cracks
7A-SlumpingGrowth faults
7. Deformation Structures (due to gravity)
5A-Load casts5B-Ball & pillow structures5C-Clay diapirs
5. Load Structures (inverse density gradient)
After Bjorlykke (1984)
+ Biogenic Structure
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1.a. Primary Bedform:Cross Stratification
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= Mega ripples
Cross lamination / ripple cross -lamination / small-scale cross-lamination
Cross lamination
Cross bedding / Large scale cross-stratification
Parallel lamination / Parallel bedding
Cross bedding
Cross StratificationBedform Hierarchy
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Cross StratificationVariant 1: Swale & Hummocky Cross Stratification
STORM SURGE
MEAN SEA LEVEL
HUMMOCKY DEPOSITION
TURBIDITE DEPOSITION
FAIRWEATHER WAVE BASE
STORM WAVE BASE
GRADED RHYTHMITE DEPOSITION(SIMPLE FALLOUT)
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Cross StratificationVariant 1: Swale & Hummocky Cross Stratification
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Cross StratificationVariant 2: Herringbone
‘Tide in’ and ‘Tide out’ are in opposite direction
Wave & beach profile are in upright position
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Location of Formation
• flaser bedding - commonly forms in relatively high energy environments (sand flats)
• wavy bedding - commonly forms in environments that alternate frequently from higher to
lower energies (mixed flats)
• lenticular bedding - commonly forms in relatively low energy environments (mud flats)
Cross StratificationVariant 3: Structure caused by tidal
(Flaser-Wavy-Lenticular)
subtidal
Low tide level
intertidal
High tide level
supratidal
T
I
D
A
L
R
A
N
G
E
TIDAL
CHANNEL
SAND
FLATS
MIXED
FLATS
MUD
FLATS
SALT
MARSH
Lenticular
beddingsubtidal
Wavy bedding
Roofed
muds
Fioser
bedding
Lateral
accretion
bedding
Low tide
level
High tide
level
intertidal
supratidal
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Cross StratificationVariant 4: Asymmetric Wave Ripple
2
L
L5 - 15 M
= 30m
Symmetric wave ripple
Asymmetric wave ripple
breaker
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1.b. Primary Bedform:Non-Cross Stratification
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Note High Energy Planar Beds
Photo: G. Voulgaris
Beach Face - South Carolina Foreshore
Traction CurrentBedforms – Parallel Structure
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Grain
Size
Fines
up
Gravity FlowBouma Sequence: Graded Beds
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2. Primary Bedform: Erosion Structures on the UNDER side of beds (sole markings)
Flute casts, Tool Marks, Groove casts, Crescent, Prod marks, bounce marks, Chevron marks
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Erosion Structure on UNDER SIDE of BEDSole Marking: Formation of Flute Cast
Erosion of bedDeposition Burial and
lithification
Subaerial
erosion
Tectonic
tilting
Tectonic
overturningSubaerial
erosion
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Erosion Structure on UNDER SIDE of BEDSole Marking: Flute Cast
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Straight ridges the result of objects being dragged on surface
Erosion Structure on UNDER SIDE of BEDSole Marking: Groove Cast
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Erosion Structure on UNDER SIDE of BEDSole Marking: Crescent
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3. Primary Bedform: Erosion Structures on the UPPER side of beds (sole markings)
Rill marks, Wind erosion, Raindrop imprints
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Erosion Structure on the UPPER SIDE of BEDSole Marking: Rain Drops
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4. Secondary Bedform: Water Escape
Dish structures, Sandstone dykes, Sand volcanoes
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Dish Structure - Ordovician - KTy
Secondary StructureWater Escape: Dish Structure
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5. Secondary Bedform: Load Structures
Load Casts, Flame Structures, Ball & Pillow Structures, Clay Diapirs
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Carbonate Load Cast – Ordovician -Kty
Secondary StructureLoad Structure: Load Cast
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Secondary StructureLoad Structure: Flame Structure
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Secondary StructureLoad Structure: Ball & Pillow
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6. Secondary Bedform: Cracks
Dessication mudcraks, Shrinkage cracks, synaeresisFrost cracks (polygons)
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Product of desiccation &
contraction of muddy sediments
Secondary StructureCracks: Mud Cracks
Mud cracks demonstrate drying-out of a thin layer of sediment fine enough to have significant cohesion. Definite proof of terrestrial setting or very shallow water marginal marine.
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7. Secondary Bedform: Deformation Structures
Slumping & Growth faults
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Secondary StructureDeformation Structures due to Gravity: Slumping
Bayah Formation, G. Walat
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Secondary StructureDeformation Structures due to Gravity: Growth Fault
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Biogenic Structure
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SOME CLUES … !
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Gra
in S
ize
Fin
es
up
Gravity FlowThe Bouma Sequence
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Comparing Bouma w/ Allen SequenceG
rain
Siz
e F
ine
s u
p
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Where does turbidite happen?
Turbidite =
High energy + suspension mixed (mud, mass flow), + SLOPE
alluvial fan, crevasse splay, submarine fan, thalweg (lag deposit), pro delta, continental shelf.
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Some CluesNormal & Abnormal Process
FLUVIAL TIDAL WAVE
Climbing Ripple a. Flaser-Wavy-Lenticular (ripple bed form)
a. Hummocky (HCS) –Swale
b. Wave Ripple –interference ripple
Through cross-bed b. Clay doublete / couplette Low angle cross stratification (foreshore sandstone)
c. Clay drapes (should be on fore set)
Rare burrow d. Lots burrow Fair burrow
FLUVIAL
FLOOD
TIDAL
TSUNAMI
WAVE
STORM
Graded bedding (turbidite) distal floodplain climbing
ripple on flood plain (covered by suspension ?)
? ? ?
Hummocky (HCS) – Swale (?)
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Some CluesTidal Process Clues: clay doublette / couplette
Fine-grained
Fine-grained
5 –
10 c
m
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Some CluesTidal Process Clues: Mud drapes
1 m
Mud drapes typical of tidal channel deposit
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normal
Flood
Climbing ripple
BA
Some CluesClimbing Ripple on Flood Plain
B
A
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The Genetic of Sand-Shale Striping Form
1. Clay drape cause of tide ripple & clay
2. Classical flysch graded bedding & clay
3. Big Lake algal blooming when lake level rise & down
4. Flood Plain deposit when flood
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Vertical & Lateral Succession
Three Types of Sediment Accumulations
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Vertical Change Succession
1. Progradation
Lateral outbuilding, or progradation, of strata in a sea-ward direction.
Progradation can occur as a result of a sea-level rise accompanied by a high
sediment flux (causing a regression).
Coarsening upward
Example where c/u happen:
Delta (in general), Delta front (mouth bar), Bar (open marine), alluvial fan, crevasse splay, submarine fan
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Vertical Change Succession
2. Aggradation
Vertical build up of a sedimentary sequence. Usually occurs when there is a relative rise
in sea level produced by subsidence and/or eustatic sea-level rise, and the rate of
sediment influx is sufficient to maintain the depositional surface at or near sea level.
Blocky
Massive, no structure: turbid / mass flow (sediment grain size are all the same) all to be sedimentation directly ≤ 1 m
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Vertical Change Succession
3. Retrogradation
The movement of coastline land-ward in response to a transgression.
This can occur during a sea-level rise with low sediment flux.
Fining upward
Example where f/u happen (winning current normal process):
Channel fill to be abandonment
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Lateral Accretion Surfaces
(lateral progradation)
.....
.......
...
.....
.......
.....
.....
..........
.....
........
1
1 2 3
. .... .
BA
Lateral Accretion
BA
BA
Lag Deposit
Lateral accretion indicate meandering (subaerial & / subaquaeous)
Lateral Change Succession
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Sedimentation Proces Lateral Accretion Surfaces
Lateral Accretion
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Cross StratificationVariant 5: Symmetric & Asymmetric Wave Ripple
2
Cruziana
Zoophycos
Skolithos
MUDDY SUBSTRATE SANDY SUBSTRATE
LOWER MIDDLE UPPER
WAVES BEGIN TO BUILD UP
SHOALING WAVES
SPILLING BREAKERS
SURF ZONE LOW
HIGH TIDE
Ichnofacies
LONGSHORE BARS
SHOREFACE
OFFSHORE
FORESHORE
STORM WAVE BASE
FAIRWEATHER WAVE BASE
L
5 –15 ML
Cruziana
Zoophycos
Skolithos
MUDDY SUBSTRATE SANDY SUBSTRATE
LOWER MIDDLE UPPER
SURF ZONE LOW
HIGH TIDE
Ichnofacies
LONGSHORE BARS
SHOREFACE
OFFSHORE
FORESHORE
STORM WAVE BASE
FAIRWEATHER WAVE BASE
VERTICAL SCALE GREATLY
EXAGGERATED
L
5 –15 ML
2
= 30m
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4. FLUVIAL DELTAIC SEDIMENTATION
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FLUVIAL
SYSTEM
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( 3%>) Low Bed load/Total load ratio High (>11%)Small Sediment size LargeSmall Sediment load LargeLow Flow velocity HighLow Gradient High
LO
W
HIG
H LO
WS
INU
OS
ITY
Bra
ided M
eandering S
traig
ht
SEDIMENT
Mud – rich Sand - rich
Channel Boundary
Flow
Bars
LO
W
RE
LA
TIV
ES
TA
BIL
ITY
HIG
H
( 3%>) Low Bed load/Total load ratio High (>11%)Small Sediment size LargeSmall Sediment load LargeLow Flow velocity HighLow Gradient High
( 3%>) Low Bed load/Total load ratio High (>11%)Small Sediment size LargeSmall Sediment load LargeLow Flow velocity HighLow Gradient High
LO
W
HIG
H LO
WS
INU
OS
ITY
Bra
ided M
eandering S
traig
ht
SEDIMENT
Mud – rich Sand - rich
Channel Boundary
Flow
Bars
LO
W
RE
LA
TIV
ES
TA
BIL
ITY
HIG
H
Channel patterns displayed by dingle-channel segments and the
spectrum of associated variables. (modified from Schumm, 1981)
Fluvial Characterization
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Fluvial Deltaic for Explorationist
AbandonedChannel
sequence
ActiveChannel
sequence
Sand deposite inactive braided channels Mudy deposition in
abandoned channels
2 M
AbandonedChannel
sequence
ActiveChannel
sequence
Sand deposite inactive braided channels Mudy deposition in
abandoned channels
2 M
Physiography and facies of a braided alluvial channel system
1. Braided channels system
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2. Meandering channels architecture
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DELTA
SYSTEM
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DeltaWhy Delta is unique ?
Delta contains all the petroleum system components from Source Rock to Trap.
Processes in Delta are composed of terrestrial processes & marine processes marine
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Prerequirement: 1. There is a fluvial/river.
2. Standing body of water.
3. Positive feature.
Sediment influx from
aerial (aerial processes) is
bigger then sea processes.
Fan shaped of deltas of the Mississippi river at Gulf of Mexico
Fan shaped of Mahakam Deltas
When Delta Formed ?:
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Fluvial /
river
Standing
Body of
Water
Create
Positif
featureRESULT
Estuarine
Alluvial Fan
Tombolo, Barrier
Bar, Spit bar
DELTA
Co
mp
on
en
t
Why Delta Formed ?
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Why Delta Formed ?
Alluvial Fan Estuarine
Spit
TomboloEstuarine
No Standing body of water No Positive feature
No River
No Positive feature
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It is form from Terrestrial to Sea …
DeltaWhere is Delta forming ?
Alluvial Fan enter to the lake Called Fan Delta
Fan Delta (delta on terrestrial)
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MORPHOLOGY AND ENVIRONTMENT OF DELTA
Morphology and environment of delta (Allen, GP 1998)
- Delta Plain
Dominated by Fluvial Processes & all terrestrial characters (Subaerial Delta)
- Delta Front
Indicated by Fluvial & Marine
Processes (Subaerial &
Subaquaeous Delta)
- Pro Delta
Dominated by Marine
Processes (Subaquaeous
Delta)
MEANDERING / TRIBUTARY/ FLUVIAL
DELTA PLAIN
ALLUVIAL PLAIN
DISTRIBUTARY
PRODELTA
DELTA FRONT
INTER DISTRIBUTARY
HEAD OF PASSES
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SEDIMENT INPUT
MISSISSIPPI
MAHAKAM
DANUBA
SAO FRANSISCO
COPPER
FLY
WAVE ENERGY FLUX TIDAL ENERGY FLUX
FLIVIALDOMINATED
WAVEDOMINATED
TIDEDOMINATED
Yukon?
Mahakam
Talu
Calorado
Mekang
Ganges - BrahmaputraKlang - Langor
Niger
Nile
Ebra
Rhane
Kelantan
Sao Fransisco
Brotos
Burdenia
Si Bernard(Miss)
Pa
Danube
Lefourch(Miss)
PraqueminesModern Miss
Fly
Cooper
Morphologic and stratigraphic classification of delta system based on relative intensity of fluvial and marine processes. (Modified from Galloway, 1975)
Delta Classification
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FLUVIAL-DOMINATED DELTA (FLUVIAL INFLUENCE)
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Mississippi Delta crevasse onto the sea (not onto flood plain) also called Crevasse Delta / Splay Delta (indicate by many marine organism)
River-Dominated DeltaInter-distributary Bay
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River-Dominated DeltaMississipi Delta
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RIVER – DOMINATED DELTA
Elongate shape
Larga-scale, gradational C.U.S.
Clean, moderately sorted sands
MIS
SIS
SIP
PI
DE
LT
AC
OM
PO
SIT
E S
TR
AT
IGR
AP
HIC
CO
LU
MN
0 10 20 30 40 50
Kilometers
Channel deposite
Sand ridge
Swamp
River-Dominated DeltaSedimentation Character
10 2 -
24
9
8
7
6
5
4
3
2
1
3 –
10 E
AC
HS
EQ
UE
NC
E3
-24
3 -
102
-6
12 –
21 (
>90
)10
-24
18 -
443
-15
18 -
120
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Schematic illustration of progradation in deltaic and non deltaic coasts. On deltaic coasts,
progradation is due to a local source of fluvial sediment, whereas on non deltaic coasts the
sediment is transported along the coast from a distant fluvial source. (Adapted from Allen, 1996).
Fluvial
Sedimentology Supply
Prograding
Delta
10’s – 100’s km
Coastal Marshor lagoon
Fluvial DistriburyChannel-Fill
Upward-CoarseningMouth Bar Sand
Offshore Marine MudstoneOffshore Marine Mudstone
Shorelance Sand
Beach
Coastal Marshor lagoon
River-Dominated DeltaProgradation
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WAVE-DOMINATED DELTA (TIDE INFLUENCE)
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Wave-Dominated DeltaNile Delta - Egypt
Source: Worldwind NASA
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WAVE – DOMINATED DELTA
Cuspate shape
Large-scale, often top-heavy C.U.S.
Clean, well sorted sands
ATLANTIC
OCEAN
0
|
5
|
10
|
Wave-Dominated DeltaSedimentation Characteristic
SAO FRANCISCO DELTACOMPOSITE STRATIGRAPHIC COLUMN
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Prodelta turbidite model @ Kutei Basin
Wave-Dominated DeltaProdelta Turbidit model in Kutai Basin
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TIDE-DOMINATED DELTA (TIDE INFLUENCE)
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Tide-Dominated DeltaBrahmaputra Delta - India
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0 5
TIDE-DOMINATED DELTA
Estuarine/linear shape
Large-scale, often disjointed C.U.S.
Clean, well sorted sands
< 3
miles
T. KARANG
JERAM
K. MORIB
P. SWET-TENHAM
3 - 5
5 - 10
10 - 20
20 - 60
KLANG DELTACOMPOSITE STRATIGRAPHIC COLUMN
Tide-Dominated DeltaSedimentation Character
9
8
7
6
5
4
3
2
1
3 –
183
-6
2 -
53
-8
5 -
246
-12
10 -
1810
-24
> 1
2
UN
ITT
HIC
KN
ES
S (m
)
LIT
HO
LO
GY
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RIVER & TIDE-DOMINATED DELTA (MAHAKAM DELTA)
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River & Tide-Dominated DeltaDelta Mahakam
Note: Delta Plain is shown, while Delta Front and Pro Delta is below the sea level.
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SOME CLUES … !
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Which one is … ?
9
8
7
6
5
4
3
2
1
3 –
183
-6
2 -
53
-8
5 -
246
-12
10 -
1810
-24
> 1
2
UN
ITT
HIC
KN
ES
S (m
)
LIT
HO
LO
GY
KLANG DELTACOMPOSITE STRATIGRAPHIC COLUMN
SAO FRANCISCO DELTACOMPOSITE STRATIGRAPHIC COLUMN
10 2 -
24
9
8
7
6
5
4
3
2
1
3 –
10 E
AC
HS
EQ
UE
NC
E3
-24
3 -
102
-6
12 –
21 (
>90
)10
-24
18 -
443
-15
18 -
120
MISSISSIPPI DELTACOMPOSITE STRATIGRAPHIC COLUMN
Can you show where is The River, Wave, & Tide-Dominated Delta?
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Core Identification …
The core character which likely indicate Wave, Fluvial & Tide-Dominated Delta are:
Wave-dominated Delta abundant wave processes:
wave ripple, swalley, HCS, beach deposit (low angle cross lamination), biogenic structure,
Tide-dominated Delta abundant tide processes:
Herringbone cross sratification, mud drapes / clay drape on foreset, flaser-wavy-lenticular, clay doublet, biogenic structure.
Fluvial-dominated Delta Fluvial character:
Climbing ripple, graded bedding, burrowing
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Reference
From many Sources