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Basin Analysis With A Spreadsheet
ASSAM-ARAKAN BASIN ( UPPE UPPER A SSA M SHE HELF LF,, FO LD & THRU HRUS ST BELT BELT INC LUDI UDIN NG MIZORAM AREA) 1.
2.
BASIN A REA
ASSAM-ARAKAN BASIN
:
1,16,000 Sq Sq . Km Km .
UPPER UPPER AS A SSA M SHELF
:
56,000 Sq Sq . Km Km .
FOLD FOLD A ND THRUST BELT BELT
:
60,000 Sq Sq . Km Km .
1.1
:
Re fe r Se d ime nta nt a ry Ba sin Ma p of India India in Notice Notice Inviting o ffe rs (NIO (NIO )
BA SIN LO CA TION M A P
EXIS XI STING IN G DA DAT TA BASE 2.1
SEISMIC DATA UPPER A SSA M
2D 3D
48205 LKM 6223 62 23 sq . k km m . (co ve ring th e m a jor oil fields)
2.2 O THER SUR URV V EYS UPPE UPPER A SSA M G-M Surveys Ap p rox. 28 2840 403 3 sta tions tion s Aero-magnetic Ade qua tely c overed surveys Geological/ PhotoAdeq uately uately c overed overed geological surveys
FOLD FOLD A ND THRUS HRUST T BELT BELT 12094 Sq Km
123 Sq . Km .
FOLD FOLD A ND THRUS HRUST T BELT BELT Ap p rox. 11 1100 00 sta tions tion s
Pa rtia tia lly c overed. Ade qua tely tely c overed. overed.
2.3 WELL WELL DA TA
Explo xp lora rato to ry Wells We lls Oil / G a s Dis Disc ov e ries
UPPER A SSA M
FOLD FOLD A ND THRUS HRUST T BELT BELT
> 815
> 210
90 Oil a nd Ga s field s
17 o il a nd g a s field s.
3.
BLOCK ON OFFER :
1 Blo c k : AA-ONN-2005/ 1
4.
BASIN TYPE
:
5.
PROVEN / EXPECTED SEDIMENTARY SECTIO N :
STRUCTURAL UNITS
Polyhistory Ba sin
Ag e ra ng e
CRETATEOUS TO RECENT
UPPER ASSAM SHELF
Thic kne ss in m .
~ 7000
(But Ma inly Tertiary) FOLD A ND THRUST BELT
PALEOCENE TO RECENT
~ 10,000
5.1 STRATIG RAPHIC SUCCESSIO N OF UPPER ASSAM SHELF CHRONOSTRATIGRAPHY QUATERNARY
AGE* FORMATION (Ma)
2.0
PLIOCENE 5.1
E N E G O E N
ALLUVIUM DHEKIAJULI NAMSANG NAZIRA SST.
THICK. (m)
LITHOLOGY SOU RC E R ES SEA L OI L & GA S
6 00-1000 600-1000 600-1500 250-550 250-550
1. TOC : 0.9 - 6.1% VRo : 0.6 - 0.85% KEROGEN : TYPE - III & II
20-580
GIRUJAN CLAY 50-2300
UPPER E
11.3
N
MIDDLE
E
TIPAM 400-1500 SANDSTONE
2. TOC : 2.3 - 9.8% VRo : 0.50-0.65% KEROGEN : TYPE -III & II
14.4
C O I
LOWER
M
LEGEND 24.6 E N E UPPER C O
E N E G O E L A P
G I L LOWER O
UPPER
E N E C O E L A P
BARAIL SST. UNIT (MAIN SAND)
50-500 SAND / SAND STONE
1 KOPILI
100-450
SYLHET LIMESTONE
50-225
O O O O
LIMESTONE
COAL, LIGNITE
50.5
54.9
O
GRAVEL, CONGLO.
42.0
LOWER
MUDST. / SHALE
SILT / SLTST.
32.8
38.0
E N E CMIDDLE O E
2
BARAIL COAL-SHALE 50-500 UNIT
TURA SST. (BASAL SST)
V
20-200
UC
UPPER
+ + UC +
METAMORPHICS UNCONFORMITY
60.2
X
LOWER
CRETACEOUS ? PRECAMBRIAN BASEMENT
+V V+
VOLCANICS GRNITIC BASEMENT
X
IGNEOUS INTRUSIVE
65.0 UC
UC +
+ +
+ +
+ +
+
UNCONFORMITY
+
5.2 STRATIGRAPHIC C OLUMN O F NA GA SCHUPPEN BELT AND CACHAR – TRIPURA FOLD BELT
AGE
SW &S
SW &S
NE
~
RECENT
~
ALLUVIUM
E C O I L P
. L
DUPITILA
P
E N E C O G I L O
E T A L Y L R A E
. L. C O M. E E.
PALEO. CRET. ?
~ ~
~ - D G E E T N F A ~ P A ~ F I I T S U D N M O ~ ~ N E A R ~ ~ U R N G
BOKABIL
~
~
~
~
~
~
~
~
MIDDLE BHUBAN
~ ~
~ ~
~ ~
~
~
~
~
~
. P G UNDIFF. G N A S I BASE NOT D KNOWN
G A S
SOURCE ROCK CHARACTERSTICS
VRo : 0.69 – 1.94% KEROGEN : TYPE-III
500 6701000 630
~
2. TOC : 0.64 – 2.4%
~
~
~
~
1850
VRo : 0.57 – 0.62%
0850
KEROGEN : TYPE-III & II
700 - 2300
500 - 1000 400 - 750 400 - 1700
500 - 1000
LOWER BHUBAN
RENJI . P G L JEN AM I A R A B LAISONG
&
1. TOC : 0.5 – 7.6% 100-300
~
~
. F F I D N U
UP.BHUBAN
S E A L
O I L
~
~
~
~
R E S.
~ ~
~
. P GOBINDGIRU G JAN PUR M A P TIPAM SST Fm. I T
E U N . O R E M G A C M O R I . U M E S
NE
~
~
DIHING Fm .
PLEISTOCENE A L UPPER I T I DUPITILA E P U N D LOWER
Sa nd sto ne s in Paleoc ene to MioPliocene sequences Fractured granitic Basement. Sha les in Eoc ene – Oligocene sequences
•
•
PROVEN / EXPECTED SOURCE ROCKS
•
PROVEN / EXPECTED CAP ROCKS
7.
E H P A J A R
BB 1000
UB MB 2000
BR 3000
A M I D E K U M U H C
T A H G A R O H K
E H P I Y N E T
4000
SYL TU
T A H G M A I R U
NE G N A R K E M
A L L O H R O B
G N I T A W L A H
N A J I N I G A N
I N A I R A M
I L A R A H C
I R A B A J A R
A R I Z A N
A W K A L
POST - TIPAM
E N E C O I M E T A L E N E C O I M D I M
U C
U C
7 TIPAM (UNDIFF.)
8
T(U)
7
~
U C
6 BOKABIL
I T U N T S S + U C A I L + R A 5 B L I + I P T E + K O H L 4 Y
. . C O G O I E L . O P U O T
S
C O E . + 2+ E N C D E I C O + + E M O . E E O L + + T A O + + + + E P T +
+
+
+
+
+ +
+ +
+
E N P K T R C
+
~
+
+
+
+
20 km
M S M K G R R U K
G K B M
G A N A
U S T T H R
~
GIRUJAN ~
2000
~
7b
~
TS
7a
U C
3000
5a +
+
+
+
+
5 +
5a
W K L
5 4
BR KP
BARAIL COAL8 SHALE UNIT 7 T(U) BARAIL 7c NS SST. UNIT
POST-TIPAM
KOPILI Fm
GIRUJAN CLAY
3 SYL SYLHET Fm
N
2
TU
1 + +
TURA Fm BASEMENT
UC : UNCONFORMITY
7b
~~
7a TS 6 BB
TIPAM (UNDIFF.) NAZIRA SST.
TIPAM SST.
44 +
. R G M A P I T
BOKABIL
UB
UPPER BHUBAN
MB
MIDDLE BHUBAN
4000
+ +
LEGEND A H Z C N
~
~
~
~
KOPILI
R.
N N T R G L M N H
7c
~
+
SCALE +
~
~
~
T UN IT BARAIL SS
+
+
NS
~
~
BARAIL COAL-SHALE UNIT
+
10
~
~
~
+
0
+ +
+
~
+
+ + HILLS + + MIKIR
+
+
+
3
+
1000
UC
~
+
6000
N O A G I R A M O S A K
8 POST TIPAM
+
5000
•
0 m
E T N N E E C C E O I R L P O T
. L . C O O T . E M
KP
Sha les in Eoc en e to Ea rly Mioc ene sequences. Intra-formational sha les in Olig oc ene to Mioc ene sequences.
•
Intra-formational sha les in Eoc en e to Mio-Pliocene sequences.
•
Sa nd sto ne s in Oligo c ene to Miocene sequences.
•
REPRESENTATIVE GEOLOGIC AL CROSS SECTIO N THROUGH MAJOR OIL & GAS FIELDS OF UPPER ASSAM SHELF
SW
TS
FOLD AND THRUST BELT
SECTION THROUGH BRAHMAPUTRA VALLEY-DHANSIRI VALLEY
+
+
5000
I
N U H K A L
NW
T S U R H T
C
.
N E S MI L O H
H T N A G N O K
T S U R H T
.
N A SI D
H T G
U H KI D
T S U R H T
U P A T
NAGA SCHUPPE N ZO NE
E
T S U R H T
SE
BELT OF CENTRAL DISANG
E’
Km.
Km.
0
G
G
N
N 2
T + G B
T
K
4
+
B
+ 0
6
+
K
+
SY
+
B
B
+
T D
S B
K
+
R
T
T
S
N AG A T H .
0
G
T
R
B
+
5 Km.
T
K
K
+ +
+
SY
+
R
J
B
K
+SY + +
D
D
+
4
J K
SY
+
+
K
+
+
6
+
NAZIRA GELEKI T U S R H T E T T S A N G U S U MARIANI H R R D I S T T T S H S U T S P U U T U T A R R R N TITABAR T H H H E T S A I T M U G E’ N I H U L K N A I H O D K H A C L
LEGEND
N
NAMSANG FM.
L
LAISONG FM.
G
GIRUJAN CLAY
B
BARAIL (UNDIFFERENTIATED)
T
TIPAM SST.
K
KOPILI FM.
S
SURMA GROUP
SY
SYLHET LIMESTONE
R
RENJI FM.
D
DISANG GROUP
J
JENAM FM.
+ +
GRANITIC BASEMENT
SCHEMATIC GEOLOGICAL SECTION ACROSS NAGA SCHUPPEN ZONE (NSZ) AND THE ASSAM – ASSAM – ARAKAN FOLD BELT (AAFB) Section shows following structural features : I. Extension of Assam shelf beneath NSZ. This subthrust section is envisaged to contain several potential structural traps. II. Imbricate thrust system of NSZ. Thrust slices are expected to contain oil accumulations as in Digboi & Kharsang fields. III. Gentle folding in the belt of Central Disang. Intra-formational sandstone layers are envisaged to contain hydrocarbons in strati-structural traps.
8.
2
R
PROVEN & EXPECTED PLAY TYPES
UPPER ASSAM SHELF FOLD AND THRUST BELT • STRUCTURAL AND C OMBINA TION • LARGE ANTICLINAL TRAPS IN TRAPS IN PALEOCENE TO MIOOLIGOCENE TO MIOCENE PLIOCENE SEQUENCES SEQUENCES
• SUBTLE TRAPS IN BASENENT ROCKS
• STRUCTURAL, COMBINA TION & STRATIGRAPHIC TRAPS IN OLIGOCENE AND MIOCENE SEDIM ENTS IN THE BROAD SYNCLINAL VALLEYS
BLOCKS ON OFFER
LOCATIONS OF THE BLOCKS
BLOCK : AA -ONN- 2005/ 1 1.
BLOCK AREA
2.
EXISTING DATA BASE 2.1 SEISMIC DATA :
363 Sq . km. (A p p rox.) 2D : 600 LKM
SEISMIC COVERAGE MAP
2.2 OTHER SURVEYS
Ge olog ica l field ma p p ing Grav ity-Ma g net ic surve y
Entire a rea Entire b loc k a rea
Aerom a gne tic survey
Pa rtially c ove red .
2.3 WELL DA TA:
Num b er of Explora to ry wells
3.
1
STRATIG RAPHIC SEQUENCE ENCOUNTERED IN WELL TENYIPHE-1
AG E
E N E E T C A L O I M
FORM ATIO N DEPT H
LITHO LOGY
E N O M T A S P I D T N A S
DESCRIPTION IN BRIEF
REMARKS
M – GRAINED SANDSTONE
SHALE
2000 ~ ~
E N
~ ~
E
L
C
I
O I
B
M
A
E
K
~ ~
~ ~
~ ~
SANDSTONE AN D SILTSTONE SHALE SANDSTONE AN D SILTSTONE
~ ~
2500
~ ~
SHALE
L D D I
O
~ ~
SHALE
B ~ ~
M
~ ~
~ ~
SILTSTONE, SHALE
~ ~
OIL IN NEARBY KHORAGHAT AND NAMBAR FIELDS
3000 ~ ~
~ ~
OLIGO BARAIL CENE E
I
E
L
O
P
E
O
A L
ARCHEAN
~ ~
3500
FINE GRAINED SANDSTONE
SHALE WITH MINOR SANDSTONE ~ ~
~ ~
SHALE
SHALE WITH MINOR SANDSTONE
K 4000
E E L N SYLHET D E D C LIMESTONE I O M E PALEOCENE
~ ~
I
E
T
~ ~
~ ~
N C
~ ~
SHALE
LIMESTONE
4500
TURA SST.
SANDSTONE + + + + + + +
GRANITE
OIL SHOWS
5.
SOME OF THE INTERPRETED PLAY TYPES LINE : NL-20-03
NW SP
500
450
400
350
300
SE 250
200
150
100
50
TIPAM SANDSTONE T OP
1400
1600
1800 BO KA BIL F O RM A T IO N T O P
S2000 M N2200 I T W2400 T
B AR A I L F O RM AT I O N T OP K OP I LI F O RM AT I O N T O P
2600
F
2800
S YL H E T LS T .T OP
3000
B AS E M E N T T O P
3200
F
SECTION SHOWING A CONSPICUOUS STRUCTURAL HIGH. AMPLITUDE OF THE STRUCTURE INCREASES DOWNWARD UPTO BASEMENT TOP
LINE : NL-20-03
NW SP
900
800
700
600
500
SE 400
300
200
100
1200
1400 T IP AM SA ND ST O NE
1600
T OP
F
1800
S M
BO KA BIL F O R M A T IO N T O P
2000
N I T2200 W T 2400
K O P I LI F M. T OP
F
B A R A I L
F M. T OP
F
2600
2800 SY LHET LST .T OP
3000
BAS EMENT T OP
F
F
F
SECTION SHOWING FAULT BOUNDED STRUCTURAL FEATURES (PROBABLY FAULT CLOSURES), INVOLVING THE STRATIGRAPHIC SEQUENCE FROM BOKABIL FM. TOP TO BASEMENT.
