csb_stratigraphy.pdf

8/10/2019 CSB_Stratigraphy.pdf

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For CPI internal use only Susianto, July 2007

Central Sumatra Basin

StratigraphyCentral Sumatra Geology Course

Main Part 60 min session

Rumbai 30 July - 3 August 2007

Sumatera Stratigraphy Team


2/25


Stratigraphic Classif ication Development

ALLUVIUM

MINAS FM

ALLUVIUMALLUVIUM

MINAS

ALLUVIUM

TUFF

ALLUVIUM

PLEISTOCENE

PETANI( unchanged )

PETANI( unchanged )

PETANI

TELISA FM

TELISA

DURI

BEKASAP FM

FMSIHAPAS

GRO

UP

BANGKO FM

MENGGALA FM

PEMATANG FMAND OTHER Pre-

SIHAPAS TERTIARYUNITS

( unchanged )

Pre-SIHAPAS( unchanged )

SIHAPAS

GR

OUP

TELISA

BEKASAP

MENGGALA

Balai Mbr

KUBU

HIATUS

SINTONG Ss Mbr

KUBU Ss Mbr

SIHAPAS

MarineSands

Fresh WaterSands

U. Redbeds

PEMATANG

L. Redbeds

SEBANGA S. S. &Qtzt

TAPANULIS

IH

A

P

A

S

A

N

D

O

LD

E

R

PETANI

TELISA

W

ing

foo

t

Barren

Zone4

Zone5

Zone6

G

lo

b

in

g

e

rin

o

id

e

s

O

rbuling

Zone3

Zone 1& 2

Rupat

PETANI

TELISA

SIHAPAS

Wingfoot

Kubu

BrownShBarrenPEMATANG

SEBANGA

TapanuliP

A

L

E

O

G

E

N

E

O

LIG

O-

M

IO

CENE

L

O

W

E

R

B

E

K

A

S

A

P

U

P

P

E

R

B

E

K

A

S

A

P

D

U

M

A

I

LO

W

E

R

P

U

N

G

U

T

U

P

P

E

R

P

U

N

G

U

T

PETANI

Upper

Shale

Mbr

TELISA

PETANI

DUMAI

Midle

Shale

TELISA

Upper Sands

HOLOCENETERRACE DEEP MINAS

ALLUVIUM

MINAS

ALLUVIUM

MINAS

ALLUVIUM

MINAS MINAS

ALLUVIUMALLUVIUM ALLUVIUM

MINAS

ALLUVIUM

MINAS

ALLUVIUM

MINAS MINAS

ALLUVIUM

MINAS

ALLUVIUM

DUMAIDUMAIDUMAI

PETANI

PETANIPETANI

Lower Sands

Kubu

SEBANGAShale

SEBANGA Sands(Marine)

KEMPASContinental

DURI

SIHAPAS

Pre-SIHAPAS

TELISA

Lower TelisaSands

G

lo

b

ig

e

rin

o

id

d

e

s

F

a

c

ie

s

L

O

W

E

R

U

P

P

E

R

Pre-TELISA SIHAPAS

PEMATANGSHALE

Lower

Sand

Mbr

Kubu Ist

Transgressive

PhaseSIHAPAS

TELISA

Lower Sands

TELISA(Globirinoides)

TELISA(Marine)

SANDSTONESeries

(Continental to

Brackish)SIHAPAS

FluviatilePhaseOLD TERTIARY

FORMATIONS(Continental)

PALEOGENE(undifferentiated)

Pre-TERTIARY

EARLY

MIDLE

LATEWingfoot

PALEMBANGPALEMBANG

Kubu

(Marine to

Brackish)

I

V

VI

VII

VIII

TOS

M

IO

C

E

N

E

G

lo

b

ig

e

rin

o

id

d

e

s

PLIO

CENE

L

O

W

E

R

U

P

P

E

R

L

O

W

E

R

M

ID

.

(Continental)

BAILEY, 1937Mountain Front

AGEGURHAM, 1939Mountain Front

LEROY, 1941Mountain FrontNW C&T Area"A"

FOX, 1941Sebanga - Duri

DOPPERT &ROZEBOOM,

1956, Bekasap

PLIOCENE

U

-

M

M

I

O

C

E

N

E

U

M

IO

C

.P

L

IO

C

E

N

E

N

E

O

G

E

N

E

L

O

W

E

R

M

IO

C

E

N

E

(?

)

WESTRA &WALLER, 1959

GUPPY, WESTRA& WALLER, 1960

GUPPY & ALLEN1962

Pematang Trough&

Rokan Uplift

DOPPERT,1968

HAMILTON &ZWARTKRUIS

1969

ZAPPATERRA, 1971CPI Contract Area

R.K WHITE, 1975CPI, C&T CW

and C&T-PS Areas

STAGES

G

H

J

K

L

M

N

O

P

I

V

VI

VII

VIII

O

rbuling

L

-

M

M

I

O

C

E

N

E

L

O

W

E

R

M

I

O

C

E

N

E

EO

C

E

N

E

(?)-O

LIG

O

C

E

N

E

BASEMENT

Stages

Historical Development of Tertiary Stratigraphic Classification in Central Sumatra (1937-1985)


3/25


TECTONOSTRATIGRAPHIC CHART - CSB

Late

Middle

E

arly

R

ift

Phase

E

o-Oligocene

F1

F0

N 17

N 16

N 15

N 14

N 13

N 12

N 11N 10

N 8

N 7

N 6

NN 9

NN 8

NN 7

NN 6

NN 5N 9

N 5

N 4

2. 8

5. 2

6. 6

10.3

15.5

16.5

22.5

Epoch

25.5

FaunalZones

45

StructuralEpisode

65

Forami-nifera

NN 4

Nanno-plankton

NN 3

Pleistoceneand Recent

NN 2

Pliocene

NN 1

P r e -Tertiary

L i t h o l o g yU n i t s

SW

Brownish Gray, CalcareousShale and Siltstone,Occasional Limestone

Greywacke, Quartzite,Granite, Argillite

Lake Fill/Upper Red BedCoalzoneBrown ShaleDark Brown Shale,

Lower Red BedRed and Green C laystone andFine to Medium GrainedConglomeratic Sandstone

Bekasap Fm.

Fine to Coarse Grained

Sandstone, Conglomeratic

Gray, Calcareous Shale WithSandstone interbeds andMinor Limestone

Menggala Fm.

F3

F2

25.5

Telisa Fm.

"A" Marker

"B" Marker

13.8

Barisan

Compressional

Phase

S

ag

P

hase

Bangko Fm.

Medium to Coarse GrainedSandstone and Minor Shale

M.Y.BP

Duri

Figure III-2 An E-W Oriented Tectonostratigraphic Chart Showing Lithology and SummarizingChronostratigraphy

Gravel, Sand and Clay

NE

Greenish Gray Shale,Sandstone and Siltstone

P

etani

G

roup

S

ihapas

Group

Pematang

Group

Basement

Duri Event(Hiatus)

Minas Fm./Al luvium

Miocen

e

Lithostratigraphy

After White 1975

Pematang Group consists of

predominantly non marine

sediments

Sihapas Group consist of

predominantly marine

sediments

This Stratigraphic Column

incorporated structural

episode, not necessarily

tectonic

Please note that F1, F2 and

F3 are structural/faulting

Period, not tectonic periods


4/25


STRATIGRAPHIC OF THE CENTRAL SUMATRA B ASINSTRATIGRAPHIC OF THE CENTRAL SUMATRA BASIN

L

O

W

E

R

R

E

D

B

E

D

S

F

M

EPOCH

AG E

TIME

(M.Y.B.P.)

RELATIVE

SEA LEVEL

CHANGES

LITHOSTRATIGRAPHIC UNITS

WE

L

O

W

E

R

R

E

D

B

E

D

S

F

M

HIATUS

HIATUS

UPPER

REDBEDS

FM

BROWN

P E M A T A N G G R O U P

SHALE

FM

P E M A T A N G G R O U P

KIRI

COALZONE

FM

BASEMENT(PRE

-TERTIA

RY)

BASEMENT

(PRE

-TERT

IARY)

BANGKO FM

BEKASAP FM

DURI FM

PLEIS

TOCENE

PLIOCENE

LATEMIOCENE M

ESSINIAN

TORTONIAN

MID

MIOCENE

EARLYMIOCENE

AQUITANIAN

BURDIGALIAN

OLIGOCENE

EOCENE

YPRESIAN

LUTETIAN

NARTONIAN

LATTORFIAN

RUPELIAN

CHATIAN

2

1

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

3536

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

PETANI FM

MINAS FM

PLANKTON

NN 21

N N 1 9

NN 18

N N 1 1

N N 1 0

NN 9

NN 4

NN 3

NN 2

NN 1

N 2 3

N 2 2

N 2 1

N 1 9

N 1 8

N 1 7

N 1 6

N 1 5

N 9

N 8

N 6

N 5

N 4

N 7

?

NANNOPLANKTON

P R E S E N TS E A L E V E L

K A N A N M B R

U N D I F F

S I H A P A S

Y A N GA S L IM B R

SI B U N G M B R

U P P E R

P E M A T A N G

F M

L O W E R

P E M A T A N G

F M

?

OIL BEARING RESERVOIRS

GAS BEARING RESERVOIRS

BASEMENT(PRE-TE

RTIARY)

F L O R S C H U E T Z I A

T R I B O L A T A

P A L Y N O L O G I C

Z O N E

R E T I T R E P O R I T E S

V A R I A B I L I S

P A L Y N O L O G I C

Z O N E

W I N G F O O T M B R

SINTONG MBR

FM

U P P E R

R E D B E D S

BIOSTRATIGRAPHICZONE

HIATUS

ANTARAFANG

LOMERATE

S I H A P A S G R O U P

TELISA FM

ASSUMEDFANGLOMERATE

ASSUMEDFANGLOMERATE

NN 20

NN 17

NN 16

NN 15N 20

NN 14

NN 13

NN 12

NN 8NN 7

NN 6

NN 5

N 14

N 13N 12N 11N 10

MENGGALA FM

fileC:\data\s

tratcsb.

Lithostratigraphy

After White 1975

This stratigraphic column

generally showing the same

ideas with the previous one,

except this Stratigraphic

column does not incorporate

structural episode.

The lateral extend of

stratigraphy is better

described by this column and

more detail age scale and

eustatic curve

Please note that the eustatic

curve does not directly

correspond to Pematang

Group Lithostratigraphy


5/25


Tectonostratigraphy

Heidrick & Aulia 1996

Structural activities strongly

drive the sedimentation and

stratigraphic sequence in

Pematang Group RiftStratigraphy

In Miocene structural

activities drive the

configuration of sedimentsgeometry in Central Sumatra

Basin in for

Please note that from Early to

Late Miocene, the basinssetting gradually changed

from transitional to more

basinal setting


6/25


Chronostratigraphy

This viewgraph shows that the lateral extend of sand body is not layer cake

In time, deposition may change from sand prone to mud/shale prone system

**Please note that the sediment thickness here is not in meter but it is time interval


7/25


Sequence Stratigraphy

PALEO-PALEO - ENVIRONMENTS

INTERBEDDED WITHESTUARINE ANDINTERTIDAL SANDSTONES

STACKED FLUVIALCHANNELS AND

ALLUVIAL CONGLOMERATES

INTERTIDAL SHALES

BEKASAP

25.5 ma

SEQUENCES SYSTEMS

MIDD

LE

UPPER

MIDDLE

NONMARINE/

NONMARINE L S T

(I V F)

)(

INNORTHERNARE

A

NAMES

MENGGALAFORMATION

UNNAMED SHALE

BRAIDED FLUVIAL

TYPICAL LOG SOUTH CENTRAL SUMATRA

BANGKO SHALELOCALLY

SANDS

MENGGALAFORMATION

TELISAFORMATIO

N

HST

HST

HARDGROUND

HARDGROUND

HST

HST

INTERTIDAL SHALESINTERTIDAL

SANDSTONES

ESTUARINE SANDSTONES

AND SILTSTONES

NEAR SHORE SHALE

PELAGIC SHALE

SILTSTONES AND SANDSPELAGIC SHALE,

SILTSTONESPELAGIC SHALE,

PALAGIC SILTSTONES

INTER

NERITIC

ESTUARINE

NERITIC

INNER

NE

RITIC

INNERTO

NERITICTO

BATH

YAL

TIDALTO

IN

NER

BATHMETRY TRACTSFORMATION

SB 15.5 ma

SB 16.5 ma

SB 17.5 ma

SIHAPASGROUP

SB 21 ma

22 maSB

SB

(UPPER RED BEDS)PEMATANG GROUP

T S T

SUBAERIAL EROSION

SINTONG

SUBMARINE EROSION

SANDS

OR

TST.

THESESANDSTHICKEN

TOBECOMEDURIF

MTST

TST

TST

TST

LST

IVF

( NOT TO SCALE )

ESTUARINE /

Generalized sequence stratigraphy of South Central Sumatra. Please note thebathimatry and the pale environtment interpretation.


8/25


Sihapas Group


9/25


Sihapas Group Stratigraphy

EPOCH

A G E

TIME

(M.Y.B.P.)

RELATIVE

SEA LEVEL

CHANGES

LITHOSTRATIGRAPHIC UNITS

W E

HIATUS

BANGKO FM

BEKASAP FM

DURI FM

LEIST

OCENE

PLIOC

ENE

LATEMIOCENE

MESSINIAN

TORTONIAN

MID

MIOCENE

EARLY

MIOCENE

AQUITANIAN

BURDIGALIAN

2

1

3

4

5

6

7

8

9

10

111 2

13

14

15

16

17

18

19

20

21

22

PETANI FM

MINAS FM

PLANKTON

NN 21

NN 19

NN 18

NN 11

NN 10

NN 9

NN 4

NN 3

NN 2

NN 1

N 23

N 22

N 21

N 19

N 18

N 17

N 16

N 15

N 9

N 8

N 6

N 5

N 4

N 7

NANNOPLANKTON

P R E S E N TS E A L E V E L

K A N A N M B R

U N D I F F

S I H A P A S

Y A N GA S L IM B R

S I B U N G M B R

WIN G F O O T MB R

SINTONG MBR

BIOSTRATIGRAPHICZONE

HIATUS

S IH A P A S G R O U P

TELISA FM

NN 20

NN 17

NN 16

NN 15N 20

NN 14

NN 13

NN 12

NN 8NN 7

NN 6

NN 5

N 14

N 13N 12N 11N 10

MENGGALA FM

To refresh Sihapas lithostratigraphy. Do you see any difference

case/stratigraphic pattern in your area of work/field?


10/25


PALEO-PALEO - ENVIRONMENTS

INTERBEDDED WITHESTUARINE ANDINTERTIDAL SANDSTONES

METASEDIMENTS; QUARTZITE,

CARBONATE, METAGREYWACKES,GRANITE.

STACKED FLUVIALCHANNELS ANDAL LUVIAL CONGL OMERA TES

INTERTIDAL SHAL ES

BEKASAP

25.5 ma

SEQUENCES SYSTEMS

MIDDLE

UPP

ER

MIDDLE

NONMARINE/

NONMARINE

L S T(I V F)

)(

IN

NORTHERN

AREA

NAMES

MENGGALAFORMATION

SUBAERIAL UNCONFORMI

REGIONAL, ANGULAR

+++++

+

UNNAMED SHALE

BRAIDED FLUVIAL

TYPICAL LOG SOUTH CENTRAL SUMATRA

BANGKO SHALELOCALLY

SANDS

MENGGALAFORMATION

TELISA

FORM

ATION

HST

HST

HARDGROUND

HARDGROUND

HST

HST

(PALEOSOL)DEEP WEATHERED ZONE

INTERTIDAL SHALESINTERTIDAL

SANDSTONES

ESTUARINE SANDSTONES

AND SILTSTONES

NEAR SHORE SHALE

PELAGIC SHALE

SILTSTONES AND SANDSPELAGIC SHALE,

SILTSTONESPELAGIC SHALE,

PALAGIC SILTSTONES

INTER

NERITIC

ESTUARINE

NERITIC

INNER

NERITIC

INNER

TO

NERI

TIC

TO

BATHYAL

TIDALTOIN

NER

BATHMETRY TRACTSFORMATION

SB 15.5 ma

SB 16.5 ma

SB 17.5 ma

SIHAPAS

GROUP

SB 21 ma

22 maSB

SB

BASEMENT

(UPPER RED BEDS)PEMATANG GROUP

T S T

SUBAERIAL EROSION

SINTONG

SUBMARINE EROSION

SANDS

OR

TST.

THESE

SANDS

THICKEN

TO

BECOMED

URIFM

TST

TST

TST

TST

LST

IVF

( NOT TO SCALE )

ESTUARINE /

Sihapas Group Stratigraphy

Typical log response of

Sihapas Group in blue

box (southern CSB area)

How about the typical log

response in your area

Please note that there issubmarine erosion, how

could that happen?

Where did the sediment

came from? Northeast?East? North? or West?


11/25


Sequence boundary types

.

mfs

SB

Intraclasts

Glossifungites

Lowershorefacesandstone

mfs

SBGlossifungites

Channel

Shell lagConglomerate

mfs

SBGlossifungites

Lowershorefacesandstone

Nodular

mfs

SB paleosol

EstuarineChannel

Coal

Shallow Marine and Estuarine Lithofacies

TST

HST

TST

HST

TST

HST

HST

TST

Hardground

Hardground

Tidal

Sequence Boundary Types:

Central Sumatra

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T I M E

Relative Sealevel Curve

RelativeRise

MFS

MFS

SB

TL

HSTTSTLSTHST

Key:Imagine the process and

depositional setting from

the lithologic assemblage


12/25


Sequence boundary types and recognition

ESTUARINE DOMINATED SYSTEMS TRACTSLOW WAVE ENERGY, HIGH TIDAL ENERGY

TST

IVF

SEQ. BOUNDARY

(SUBMARINE EROSION SURFACE)

MAX. FLOOD. SURFACE

SEQ. BOUNDARY

(SUBAERIAL EROSION SURFACE)

HST

GR. or SP. Log

Cross bedded, mediumsandstone

Hardground

GlossifungitesCross bedded, fineglauconitic sandstone

Very fine glauconiticsandstone

Massive, mediumsandstone

Massive, coarsesandstone

sandstone

TST

Massive, conglomeratic

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Estuarine/Intertidal

Sub-/Intertidal

MFS

MFS

SB

TL

HSTTST

LSTHSTTST

T I M E


RelativeRise


13/25


Sequence boundary types and recognition

M

FS

MFS

T I M E

SB

TSTHST

TST HST

Relative

Rise


SEQUENCE BOUNDARY IDENTIFICATIONESTUARINE DOMINATED MODEL

PARASEQUENCE

SEQ.

COASTAL DOMINATED MODEL

SEQ.

SEQ. BOUNDARY CHARACTERIZED BY CALCAREOUS HARDGROUND

OFTEN COARSE GRAINED JUST ABOVE HARDGROUND

NO EVIDENCE OF SUBAERIAL EXPOSURE

MINOR EROSION AT SEQUENCE BOUNDARY IS SUB-MARINE

SEQ. BOUNDARY CHARACTERIZED BY SUBAERIAL EROSION

TST

HST

BOUNDARY

TST

BOUNDARYHST

TSTTST

HST HSTBOUNDARY

LST (IVF)


14/25


Typical Log Character of Pematang Group

Bekasap#2 Kotabatak#5 Petani #1 Bangko#1 Minas NW #1 Duri #1 Balam SE#7

Please use your pencils to mark log pattern in each wellthen


15/25


Exercise

Please make wild guess of the formation name/lithologic unit in each

well above (slide 20)

Do you see the difference of log pattern from one well to another at

the same formation

What factors may have controlled the stratigraphic differences

What role of geological structures were playing


16/25


Pematang Group


17/25


L

O

W

E

R

R

ED

B

E

D

S

F

M

L

O

W

E

R

R

ED

B

E

D

S

F

M

HIATUS

HIATUS

UPPER

REDBEDS

FM

BROWN

P E M A TA NG G RO UP

SHALE

FM

P E M A TA NG G RO UP

KIRI

COAL ZONE

FM

BASEMENT(P

RE

-TERTIARY)

BASEMENT

(PRE-T

ERTIARY)

BANGKO FM

BEKASAP FM

EARLYMIO

AQUITANIAN

OLIGOCENE

EOCENE

YPRESIAN

LUTETIAN

NARTONIAN

LATT

ORFIAN

RUPELIAN

CHATIAN

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

NN 3

NN 2

NN 1

N 6

N 5

N 4

?

K A N A N M B R

U N D I F F

S I H A P A S

Y A N GA S L IM B R

S I B U N G M B R

U P P E R

P E M A T A N GF M

L O W E R

P E M A T A N G

F M

?

OIL BEARING RESERVOIRS

GAS BEARING RESERVOIRS

BASEMENT(PRE

-TERTIARY)

FL O RS CHUE TZI A

TRI B O L A TA

P A L Y NO L O G I C

Z O N E

RETITREPORITES

VARIABILIS

P A L Y NO L O G I C

ZO NE

SINTONG MBR

FM

UP P E R

RE D B E DS

ANTARAFANGLOMERATE

ASSUMEDFANGLOMERAT

E

ASSUMEDFANGLOMERAT

E

MENGGALA FM

Pematang Group Stratigraphy

Please note the lithologic subdivision of Upper Red Bed, Brownshale and

Lower Red Bed to the age/across time boundary

Triangular wedge shape within

Trough in dip line seismic

section

Laterally dicontinuousstratigraphic packages

Red motted clay abundant in

upper part of stratigraphy

Typical lower GR and higher

resistivity log ressponse

Barren of marine fossils

Contain high organic content

in Brownshale

Pematang stratography is the

engine of petroleum system in

CSB


18/25


Pematang Troughs

Six main Pematang Troughs in Rokan :

Balam Trough

North Aman Trough

South Aman Trough Rangau Trough

Kiri Trough

Tapung Trough

Similarities: Half Graben architecture

Eo-Oligocene in age

Non Marine setting

Stratigraphic subdivision

Differences:

Lithologic assemblage

Stratigraphic thickness of syn-rift unitsDeep gas study report, 1999


19/25


Pematang Group Seismic Stratigraphy

Have you see any difference in the way Pematang stratigraphy been classified

FIGURE III-12 GEOLOGIC CROSS SECTIONS FROM CENTRAL PORTION

OF NORTH AMAN TROUGH

SINTONG SE-1

BORDER

FAULT

SIDINGIN-1 L-817-7058 KELOK-1 CANDI-1

2101 2061 2021 1981 1941 1901 1861 1821 1781 1741 1701 1661 1621 1581 1541 1501 1461 1421 1381 1341 1301 1261 1221 1181 1141 1101

0

5000

10000

15000

20000

URB

BSH

LRB

BASEMEN

T

FEXURAL

HINGE

BASALDETACHMENT -18,000

0

5000

10000

15000

20000

PAGER-8

BORDER

FAULT

L-817-7058 GAPURA-1 TINGGI-1

2101 2061 2021 1981 1941 1901 1861 1821 1781 1741 1701 1661 1621 1581 1541 1501 1461 1421 1381 1341 1301 1261 1221 1181 1141 1101

0

5000

10000

15000

20000

URB

BSH

LRB

BASEMEN

T

FEXURAL

HINGE

BASAL DETACHMENT -19,000

0

5000

10000

15000

20000

SW NE

SW NE

L-817-7076

L-817-7077

Pematang Group syn-rift

seismic stratigraphy:

Lower Red Bed (URB)

Brownshale (BSH)

Upper red Bed (LRB)

Seismic stratigraphic

subdivision of URB, BSH, and

LRB includes time/chrono

stratigraphy


20/25


21/25


RANTAUBAIS-2

FIGURE III-21 GENERALIZED ISOPACH MAP AND DEPOSITIONAL ENVIRONMENTSOF THE SEISMIC SEQUENCE - BLUE INTERVAL

576

1177

978

1956

290

228

1036

KELOK-1

PAGER-7

SIDINGIN

GULAMO

TILAN-1

SEDIMENT

SOURCE

4 KM

CANDI

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

RANTAUBAIS NO-1

ALLUVIAL FAN

FAN DELTA

SHALLOW LACUSTRINE

DISTRIBUTARY PLAIN

MEANDERING STREAMS

POTENTIAL RESERVOIR

> MODERATE RESERVOIR

POTENTIAL

> CLOSED-BASIN DRAINAGE

(NO OUTFLOWING STREAMS)

> GOOD POROSITY IN SANDS AT

THE BASE OF FINING-UPWARD

CYCLES IN KELOK AND TILAN

> NORTHEAST-TRENDING BORDER

FAULT SEGMENTS VERY ACTIVE

CONTOUR INTERVAL = 500

N

THIN

MEDIUM

THICK

RANTAUBAIS-2

FIGURE III-21 GENERALIZED ISOPACH MAP AND DEPOSITIONAL ENVIRONMENTSOF THE SEISMIC SEQUENCE - BLUE INTERVAL

576

1177

978

1956

290

228

1036

KELOK-1

PAGER-7

SIDINGIN

GULAMO

TILAN-1

SEDIMENT

SOURCE

4 KM

CANDI

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

SEDIMENT

SOURCE

RANTAUBAIS NO-1

ALLUVIAL FAN

FAN DELTA

SHALLOW LACUSTRINE

DISTRIBUTARY PLAIN

MEANDERING STREAMS

POTENTIAL RESERVOIR

> MODERATE RESERVOIR

POTENTIAL

> CLOSED-BASIN DRAINAGE

(NO OUTFLOWING STREAMS)

> GOOD POROSITY IN SANDS AT

THE BASE OF FINING-UPWARD

CYCLES IN KELOK AND TILAN

> NORTHEAST-TRENDING BORDER

FAULT SEGMENTS VERY ACTIVE

CONTOUR INTERVAL = 500

N

THIN

MEDIUM

THICK

Pematang Group Paleogeography

Do you agree with this interpretation?

Each sub basin / trough has a unique

geometry/architecture in respond to rifting

Trough architecture strongly control the

depositional setting dan sedimentation

Characters: Distribution of Pematang Group members confined

in a half graben/graben

Pematang Group members are unique in each

trough/graben

It will be tough to correlate across rift grabens

How about Pematang in your area?Lower Red Bed PaleogeographyNorth Aman


22/25


Pematang Sequence Stratigraphy

Deep Gas study report, 1999

Sequence Stratigraphic units:

Pematang Stage I

Pematang Stage II

Pematang Stage III (BSH) Pematang Stage IV

Pematang Stage V

Structural controlled basins architecture drive the sedimentation

Local architecture isolated CSB from global eustatic changes during Eo-Oligocene

(URB)

(LRB)


23/25


New Finding from Barumun Sub Basin

Tectonostratigraphic units:

Pre Rift (older basin deposi t)Syn-Rift

Pematang Stage I

Pematang Stage II (BSH)

Pematang Stage III

Post Rift (immediate)

Pematang Stage IV

Pematang Stage V

(URB)

Uplifting, Peneplanation

TectonostratigraphyLithostratigraphy

Barisan Uplift

Early Post Rift

Late Post rift

Rift Initiation to

Early Maximum Rift

Mid Maximum Rift

Basin Sagging

Regional Compression

and Uplifting

Basin Inversion

Wrench Tectonic

Pre-Rift

ChronostratigraphyWest East

Minas Aluvium

Basement

Pmt 4

Pmt 5Pmt 6

Pmt 7

Pmt 8

Menggala Fm.

Bangko Fm.Bekasap Fm.

Duri Fm.Telisa Fm.

Wingfoot Fm.

Petani Fm.

Pematang 2

Pematang 1

Pematang 3

Un-definite time lag

Sequence

Stratigraphy

Pematang 1-2-3

Pematang 4

Pematang 5

Pematang 6

Pematang 7

Pematang 8

DepositionalEnvironment

Late Maximum Rift

Syn-Rift

Post-Rift

Pre-Tertiary

Lowstand

Regional

Transgression

RegionalTransgression

BekasapFm

TelisaFm.

Duri

PetaniFm

Minas Fm

MenggalaFm

Bangko Fm

Upper Red Bed Fm

Brownshale Fm

Lower Red Bed Fm

PossibleGulamoFm / Sangkarewang Fm.

Equivalent

Pre-Tertiary Bohorok-Kluet Fm.

PEMATANGGROUP

SIHAPASGR

OUP

PetaniFormation

Time(M.Y.B.P)

Relative

Sea Level

Change

Epoch

Age

Non Marine

Fluvial

Lacustrine

Shallow Marine

Estuarine

DeltaDeeper Marine

Marine /

LacustrineDelta

Swamp

Marine

Non Mairnr

Delta

Deep Marine

Un-certain time lag

SB 25.5 Ma

SB 15.5 Ma

Mesozoic-Cenozoic Boundary

Uplifting, Peneplanation

TectonostratigraphyLithostratigraphy

Barisan Uplift

Early Post Rift

Late Post rift

Rift Initiation to

Early Maximum Rift

Mid Maximum Rift

Basin Sagging

Regional Compression

and Uplifting

Basin Inversion

Wrench Tectonic

Pre-Rift

ChronostratigraphyWest East

Minas Aluvium

Basement

Pmt 4

Pmt 5Pmt 6

Pmt 7

Pmt 8

Pmt 4

Pmt 5Pmt 6

Pmt 7

Pmt 8

Menggala Fm.

Bangko Fm.Bekasap Fm.

Duri Fm.Telisa Fm.

Wingfoot Fm.

Petani Fm.

Pematang 2

Pematang 1

Pematang 3

Pematang 2

Pematang 1

Pematang 3

Un-definite time lag

Sequence

Stratigraphy

Pematang 1-2-3

Pematang 4

Pematang 5

Pematang 6

Pematang 7

Pematang 8

DepositionalEnvironment

Late Maximum Rift

Syn-Rift

Post-Rift

Pre-Tertiary

Lowstand

Regional

Transgression

RegionalTransgression

BekasapFm

TelisaFm.

Duri

PetaniFm

Minas Fm

MenggalaFm

Bangko Fm

Upper Red Bed Fm

Brownshale Fm

Lower Red Bed Fm

PossibleGulamoFm / Sangkarewang Fm.

Equivalent

Pre-Tertiary Bohorok-Kluet Fm.

PEMATANGGROUP

SIHAPASGR

OUP

PetaniFormation

Time(M.Y.B.P)

Relative

Sea Level

Change

Epoch

Age

Non Marine

Fluvial

Lacustrine

Shallow Marine

Estuarine

DeltaDeeper Marine

Marine /

LacustrineDelta

Swamp

Marine

Non Mairnr

Delta

Deep Marine

Un-certain time lag

SB 25.5 Ma

SB 15.5 Ma

Mesozoic-Cenozoic Boundary

Did you anything like this in your area?

Susianto, 2007


24/25


Exercise

Please determine the Top Pematang from seismic and draw yourPematang internal sequence boundary


25/25


Sihapas Group deposited mainly in marine setting

There is an opportunity to develop a generalized model of Sihapas Group

Paleogeography

Sihapas Group provide the main reservoir for petroleum system in CSB

Pematang syn-rift stratigraphic unit is the main petroleum engine in CSB

Pematang Group syn-rift stratigraphy deposited in tectonic driven linked

depositional setting

New small sized petroleum opportunities may remain exist in our back yard

and has been waiting for us to discover them. It will depend on ourknowledge and comprehension of basin evolution of CSB

General Summary

csb_stratigraphy.pdf

Documents