Aspects of Petroleum Geology of Block-34, Al-Jazzir

Aspects of Petroleum Geology of Block-34, Al-Jazzir,SE Oman
1
Mohammed Al-Balushi & Omar Al-Ja’aidi
Ministry of Oil & Gas
Oman Stratigraphic Column
dS
Re
ea
( Q&DQD
3' 2
$5 $%,$1 6( $
Arabian Sea
( Q&DQD
3HW
URJDV
0 DHUVN
2 LO
2 P DQ
. ,1 * ' 2 0 2 ) 6$8 ' ,$5 $%,$
0 DHUVN LO
2 P DQ
2; <
0 XNKDL] QD
&LUFO
H2 LO
2 3( 1
0 DKDZW
Section from the wells
Onset of E/W Gondwana
Continent-Continent Collision
Accretion of Island Arcs
& Microcontinents
Evaporite
Carbonate
Clastic
Seal
1700
1650
1700
1750
1900
1950
Lekhwair
45100
55100
SR 4
Seismic Base Map
Fig.1
7KLVP DSLVQRW
DQDXW
KRULW
\ RQLQW
HUQDW
LRQDO
ERXQGDULHV
042
2
002
405
Krw-1
400
60
34
C
SR
21
217900
2300
2350
SS2
SS2
3
094
Ss2
20
Fiqa (Arada memb.)
Natih
Nahr Umr
Kharaib
900
TD=914.4m
Top Abu Mahara
1500
MFS
1600
1650
2400
1700
2450
1750
Pc10 Vendian?
212900
006
5
2600
1800
Hath-1
Kln-1
Dhr-1
Krw-1
1850
TD=1847.4m
2650
2700
4
91
09 7
207900
2
205400
2800
2850
2
093
SS
Limit of the
log data
SS2
095
1
202900
TD=2897m
3
05
092
6
S S 20 9
4
09 2
3
9
875
200400
V
57
7
00
S9
90
8
5
89
20
20
Hath-1 CAS
SS
1V
75
00 47
S9 207
S
CA
SR
5
08
966
SS2
Southern Area
SS2
1100
SS2
5
9
89
20
07
4
SS
40
SS
8
0
0 97
SR
07
40
SR
Exploration in Block-34 was started in 1968 by PDO, with the first 2D seismic survey.
PDO conducted several 2D seismic surveys between 1975-1982. In 1976, PDO drilled its
first hole, Dhahir-1 well.
The cores tested from this well exhibited crude oil stains and gas shows. Later, Kulan-1 and
Karawan-1 wells were spudded in early 1983. The company between 1992-1993 shot a
number of regional seismic lines. In 1993, the well Hathnar-1 was spudded. In 2002
TOTALFINAELF obtained the acreage for 3 years. Recently, the acreage is subdivided into
new blocks as shown in the Fig 1 after merging with 2004 relinquished areas of Block-6.
88
20
850
2750
Middle Area
SS2
1050
2350
2500
210400
Exploration History
825
1450
TD=2429.9m
215400
Kln-1
0 ,1 ,675 <2 ) 2 ,/ $1 ' * $6
800
1000
1550
2550
S R4
Dhr-1
$ SSUR[ 775
1400
2250
7
S R4
0029
NP
750
MFS
S93
5km
36
2.5
400
0
0
20
7
SR
003
Pre-2006 Block-34
Concession Status
-X] RUDO
+ DO
O
DQL\ \ DW
C9
V
Northern Area
Pc 20
L.Vendian ?
1350
2250
2300
220400
&LUFOHRLO
6LQRSHF
2 3( 1
52600
2 3( 1
6DO
DO
DK
50100
47600
725
1300
2200
Ghadir Manqil
42600
SR
2
40100
SR4
2 3( 1
37600
Lekhwair
700
1250
Mafraq
2150
34
35100
675
1200
2100
2000
2200
32600
750
950
2050
2150
222900
650
Shuaiba
Aruma
2100
2 3( 1
700
1150
2000
Seismic & Well data
625
900
Nahr Umr
1950
1850
Reservoir
Shale
650
1900
1800
575
600
850
Natih
1850
1750
550
800
1800
2050
2 3( 1
Dammam
1650
Shuaiba
525
600
U.E.R
1600
1600
Source Rock
500
Kharaib
550
1450
1550
0 DVLUDK
+ XQW
2 LO
450
500
1400
2
1
475
Shuaiba
Buah
1300
1350
1500
General tectono-stratigraphy of the Oman subsurface rock units modified after
Oterdoom et al. 1999. The units present in the study area represented by the
pale-purple columns. Play elements are modified after Stuart (1999)
0 DHUVN2 LO
2 P DQ
400
Shuram
Rifting
450
U.E.R
Shuram
Glaciation
Fig.2
1300
1550
Khufai
425
350
Khufai
ABU
MAHARA
375
400
1450
Buah
Shuram
300
1250
1400
“Angudan” Tectonic Event
Carbonate-Evaporite System Rifting(Najid)
Al-Noor
Birba
1050
1500
Karim
NAFUN
250
1250
1350
Amin
E
1000
1200
Mahwis
Miqrat
NIMIR
ARA
350
Rus
3
300
200
U.E.R. Equvl.
Continental-Shallow Marine
Clastics “Sag”
Barik
Fm.
Fm/Grp.
950
1150
1200
Al-Bashair
850
EXTENSIONAL
Barakat
M
VENDIAN
Ghudun
BASEMENT
Uae
Rifting
Rift Unconformity
Saih Nihayda
Mabrouk
Sagging
100 200 300
275
325
Fiqa
(Arada memb.)
L
Qatar
Yemen
5 ( 3 8 %/ ,&
2)
<( 0 ( 1
Hasirah
2 3( 1
ul
f
Oman
6LQRSHF
1st Order Flooding, Anoxic
Event
Glaciation
Sahmah
Rock Unit
U.U.E.R
MISFAR
GR
Rock Unit
0 40 80 120 160
1100
Depth
(m)
250
GR
Abu Mahara
Saudi
Arabia
650
Minor Transgression
or Lacustrine Deposition ?
Hathnar-1
INTRACRATONIC SETTING
HARBUR
COMPRESSIONAL
Thermal Doming & Rifting
Glacial Erosion
225
Taqa
Al-Khlata
175
150
900
Glaciation, Intracratonic Sag
Depth
(m)
Abu Mahara
+ XQW
2 LO
Kuwait
Drifting of Neo-tethys
Rifting in Batain Basin
Continental Clastics
MAHATTA
HUMAID
Dhahir-1
800
Gharif
HAUSHI
Base Tertiart Unconformity
200
750
Fm.
Taqa
Taqa
850
Khuff
70
3.15 Km
2.61 Km
700
4
Sudair
SAFIQ
90
Rock Unit
Fm./Grp.
650
Jilh
AKHDAR
60
600
M.U.E.R
$QDGDUNR
30
Natih
Iran
* RW
2 LO
2 FFLGHQW
DO
1 RYXV2 P DQ
Plate Reorginization
19.93 Km
Rock unit
GR
Depth
(m)
Masirah Bay
' DO
HHO
Iraq
Onlap onto Eastern High
GR
(API)
30
50
10
5
Probably Fars !
Mafraq
EXTENSIONAL
JURASSIC
Dhruma
Break Away of India
STURTIAN
600
Arabian Pennisula & Surroundings
2 FFLGHQW
DO
2 SHQ
PRECAMBRIAN
-X] RUDG' D\ P DQL\ \ DW
0 XVFDW
Tuwaiq
SAHTAN
550
377( 3
Lekhwair
CARBONATE PLATEFORM
KAHMAH
Depth (m)
Kulan-1
ACTIVE PLATE MARGIN
5 HO
LDQFH,QGXVW
ULHV
1 RYXV2 P DQ
Kharib
Habshan
COMPRESSIONAL TO TRANSTENSIONAL
500
Onset of Subduction in Neo-tethys
Regional Unconformity
Collapse of Northern High
Shuaiba
HAIMA
SUPERGROUP
6XOW
DQDW
HRI2 P DQ0 $' + $
COMPRESSIONAL
CRETACEOUS
Nahr Umr
PERMIAN TRIASSI.
450
2 3( 1
Forebulge Unconformity
1st Order Flooding Anoxic Event
Natih
WASIA
Hanifa
300
0 8 6$1 ' $0
6XOW
DQDW
HRI2 P DQ
8 1 ,7( ' $5 $%( 0 ,5 $7( 6
2nd Thrusting, Emplacement
of Nappes, Foredeep Development
Simsima
Fiqa
Karawan-1
6
INTRACRATONIC SEETING
TERTIARY
CENOZOIC
250
400
* 8 / ) 2 ) 2 0 $1
Umm Er Radhuma
200
$5 $%,$1 *8 / )
Rus
HUQF
SUPERGROUP
1 2 98 6
3( 75 2 / ( 8 0
Andhur
HADHRAMAUT
Rayda
350
,6/ $0 ,&5 ( 38 %/ ,&2 ) ,5 $1
Dammam
Arabia Eurasia &
Miroconrinents
Carbonate-Evaporite Plateform
Salil
CAMBRIAN ORDOVICIAN SILURIA. DEVONIAN
+ XQW
150
REMARKS
SEAL
ROCK
Arid Continental &
Marginal Marine Sediments
ARUMA
100
RESERV.
ROCK
SOURCE
ROCK
Taqa
Shamar
PALEOZOIC
50
Well-to-Well Correlation
PLAY COMPONENTS
LITHOLOGY/ FORMATION
FARS
CARBONIFEROUS
Sultanate of Oman Concession Map
CHRONOSTRAT.
GROUPS
MESOZOIC
Al-Jazir is an exploration acreage, located in the SE coast of the Sultanate of Oman.
Previous exploration attempts have resulted in a total of 13417.7 km of 2D seismic and
the drilling of four wildcat wells. Structures observed in the northern part of the block are
mainly extensional and evolved via different geological periods. The faults observed in
the Precambrian units were probably formed due to Precambrian extension and were
possibly related to the Najad Rift event. The influence of the Indian Plate separation from
the Afro-Arabian Plate is probably marked by the faults associated with the base
Cretaceous horizon. The Tertiary-aged faults were probably formed after the Late
Cretaceous obductional event. On the other hand, the structures in the southern part of
the block are mainly contractional, and possibly evolved due to the left-lateral, strike-slip
faulting induced by the rifting event in the Gulf of Aden. Preliminary studies on the
source rocks have proven the presence of effective source rock facies in Khufai
Formation and Masirah Bay Formation along with potential source rock facies in
Shuram, Buah, Natih Formations and Aruma Group. However, major risks are associated
with hydrocarbon generation and migration timing with respect to structural
formation.Reservoir facies are present in Shuaiba and Natih Formations, especially in the
northern area of the block. In addition to potential reservoirs in the Infracambrian
siliciclastics and carbonates.
Ar
ab
ian
G
Ministry of Oil & Gas
1-Ministry of Oil&Gas, 2-JVRCCS/Sultan Qaboos University
Abstract
Jordan
2
197900
Figure.3 Seismic base map with the wells location. The bold red line is the
well correlation panel while the bold dark-blue ones represent seismic sections
shown in page 2. The middle area lines are not used in the interpretation.
Figure 4. Well-to-well electrical log (GR) correlation in the study area. The correlation line is shown in the index seismic base map (Fig3).The reference line is taken
from the top of the Abu Mahara Group which is shown in yellow lines. The seismic data base used is highlighted by the northern & southern area in the index map. The
maximum flooding surfaces are marked with the green and blue as clear from GR signature (after Sharland et al., 2000).The dashedlines are unconformity surfaces and
the colored correlation lines are representative of the lithologies in Fig.2 . The smaller figure shows the Tertiary sequences thinning towards the north.
1

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