saurashtra offshore basin - infraline
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SAURASHTRA OFFSHORE BASIN
SAURASHTRA OFFSHORE BASIN 1. BASIN AREA : 240,000 Sq. Km. 1.1 BASIN LOCATION MAP : Refer Sedimentary Basin
Map of India in Notice Inviting Offers (NIO)
2. EXISTING DATA BASE
2.1 OFFSHORE SEISMIC DATA 2D : 43672 LKM 3D : 5626 Sq. Km.
Vintage Type Data acquired by Quantum
2002-2003 2D DGH 615 LKM
1981-2003 2D ONGC 27,177 GLK
2001-2003 3D ONGC 3023 Sq. Km.
2001-2003 2D RIL 2634 LKM
1997-2002 2D Essar 2154 LKM
1991 2D OIL (Western Geophysical) 8730 LKM
2002 3D OIL (M/s Veritas DGC) 330 Sq. Km.
2.2 OTHER SURVEYS - Gravity data – 33,306 LKM - Magnetic data – 31,519 LKM - Geochemical Sniffer surveys-4900 LKM - Satellite Gravity Survey
2.3 WELL DATA Number of exploratory wells : 18
Hydrocarbon shows : Gas and oil shows in Middle Eocene to Miocene in 6 wells.
3. BLOCK ON OFFER : 1 Block in Shallow waters
GS-OSN-2003/1
4. BASIN TYPE : Pericratonic Rift Basin. 5. PROVEN SEDIMENTARY SECTION
Age range Thickness (m)
Cretaceous to Recent ~7,000
SAURASHTRA OFFSHORE BASIN
5.1 GENERALISED STRATIGRAPHIC SEQUENCE
5.2 REPRESENTATIVE GEOLOGICAL SECTION
STRATIGRAPHIC UNITMAX.
THICK.(M)
LITHOLOGY SOURCE RES. SEAL OIL & GAS SHOW
POSTMIDDLE
MIOCENE
MIOCENE
T E
R T
I A R
Y
PALEOCENE
CRETACEOUS
700
900
450
270
OLIGOCENE
EOCENE 1500
MIDDLE
EARLY
LATE
EARLY
LATE
MIDDLE
EARLY
1. TOC - 1-4.8%VRO - 0.3-0.7%TYPE -II & III
V V V V V V
SILTSTONE
SHALE
LIMESTONE
VOLCANICS
LEGEND
DOLOMI TE
V VVVV
MESO-ZOIC
SHOWS
1
SAURASHTRA OFFSHORE BASIN
6. PETROLEUM GEOLOGY
EXPECTED RESERVOIRS :
(i) Cretaceous sandstone (ii) Eocene-Miocene shelfel carbonates / reefal build up (iii) Tertiary deep water sands (Indus Fan)
EXPECTED SOURCE ROCKS :
(i) Paleocene to Oligocene shales EXPECTED CAP ROCKS : (i) Eocene to Early Miocene shales.
7. EXPECTED PLAY TYPES :
(i) Carbonate buildups (ii) Transpressional rollovers (iii) Pinchouts and wedgeouts
8. INFORMATION DOCKET - CONTENTS
PART A
INTRODUCTION PHYSIOGRAPHY, CLIMATE AND COMMUNICATION STATUS OF EXPLORATION Geological Surveys Geophysical Surveys Exploratory Drilling TECTONIC FRAMEWORK STRATIGRAPHY GEOLOGICAL HISTORY HABITAT OF OIL AND GAS Source rocks
Reservoir development
Entrapment Conditions Hydrocarbon Potential
REFERENCES
SAURASHTRA OFFSHORE BASIN
LIST OF FIGURES
Fig. No.
Description
1. Index map of Saurashtra basin 2. Physiographic map of Indian offshore 3. Geological map of Saurashtra 4. Bouguer anomaly map of West coast offshore and Arabian sea 5. Structures identified in Saurashtra basin 6. Key wells drilled in Saurashtra offshore and adjacent areas 7. Litholog of well Ss-1 8. Lithologs of wells SSN-1 and S-2-1 9. Lithologs of wells B-107-1 and B-1-1 10. Stratigraphic relationship between wells west of Diu Arch 10A. Litholog of well OS-II-A-1
11. Litholog of well OS-II-D-1 12. Litholog of well OS - II - G – 1 13. Stratigraphic relationship between wells OS-II-A-1, OS-II-D-1 and
OS-II-G-1 14. Stratigraphic relationship among wells SOE-1, SOE-2 and SOE-3 15. Location map of DSDP sites 16. Litholog of DSDP site 219 17. Litholog of DSDP site 220 18. Litholog of DSDP site 221 19. Main tectonic elements of West-coast deep offshore basins 19A. Main tectonic elements of West-coast DEEP offshore basins &
satellite altimeter derived free-air marine gravity field 20. Geological section across Saurashtra basin 21. Seismo-geological section - Saurashtra basin 22. Litho-stratigraphy of Saurashtra basin 23. Influence of Indus fan in Laxmi depression 24. Oil and gas fields in west coast offshore basins 25. Cross plot of hydrogen index Vs tmax in well S - 2 - 1 26. Turbidite in Laxmi depression 27. Stratigraphic wedgeout 28. Carbonate buildup
SAURASHTRA OFFSHORE BASIN
LIST OF TABLES Table No.
Description
1. Seismic data acquisition and processing parameters, ONGC survey : 1975-94, D lines 1976, 1981 & 1985, BO lines 1986 – 87 and D-94 lines
2. Seismic data acquisition and processing parameters- Western Geophysical survey (1981-82)
3. Seismic data acquisition and processing parameters-oil survey 1991 (Western Geophysical)
4. Acquisition and processing parameters, ONGC survey BO lines (1988), S lines (1976, 80, 82 & 86 – 88), S1 lines (1983), D lines (1994) & DK lines (1995)
5. and processing sequence for 2D seismic survey by DGH in 2002-2003
6. General information of key wells – Saurashtra offshore and adjacent areas
7. General information of DSDP wells 8. Exploratory inputs in Saurashtra Offshore Basin 9. Average Organic Carbon distribution patterns in
Saurashtra offshore wells
SAURASHTRA OFFSHORE BASIN
PART – B
BLOCK ON OFFER
LOCATION OF THE BLOCK
GS-OSN-2003/1
200
00’
210
00’
220
00’
700 00’ 700 00’
700 00’ 700 00’
200
00’
210
00’
220
00’
0 45 Km.
Scale
D
C
E F
G
AB
GS-OSN-2003/1
S A U R A S H T R A
Drilled Well
EP-1
SAURASHTRA OFFSHORE BASIN
BLOCK : GS-OSN-2003/1 1. BLOCK AREA : 5,970 Sq. Km (Approx.) 2. WATER DEPTH RANGE : From few meters to 70m 3. EXISTING DATA BASE
3.1 SEISMIC SURVEYS : 2D - 3708 LKM
SEISMIC COVERAGE MAP
3.2 OTHER SURVEYS : Satellite Gravity Surveys
GM Surveys
3.3 WELL DATA Number of Exploratory Well - One ( EP-1 )
GS-OSN-2003/1
SAURASHTRA OFFSHORE BASIN
4. STRATIGRAPHIC SEQUENCE ENCOUNTERED IN WELL EP-1
5. TWT MAP ON TOP OF EARLY EOCENE
200
30’
200
45’
210
00’
200
30’
200
45’
210
00’
700 15’ 700 30’ 700 45’ 710 00’
700 15’ 700 30’ 700 45’ 710 00’
0 10 Km.
ScaleContour interval 50 Millisec.
S A U R A S H T R A 95010001050110011501200125013001350140014501500155016001650170017501800185019001950200020502100215022002250230023502400245025002550260026502700275028002850290029503000305031003150320032503300335034003450350035503600
95010001050110011501200125013001350140014501500155016001650170017501800185019001950200020502100215022002250230023502400245025002550260026502700275028002850290029503000305031003150320032503300335034003450350035503600
Colour Range
Drilled Well
EP-1
L I M I T
D E P O S I T I O N A L
L I M I T
D E P O S I T I O N A L
TWT
P-1
2300
P-2
S-68
GS-OSN-2003/1
U P
P E
R
M I
O C
E N
E
T O
R
E C
E N
T
AGE Depth (m) LITHOLOGY Brief description
E A
R L
Y
T O
M
I D
. M
I O
C E
N E
OLIGOCENE
EOC
ENE
2600
1200
1400
1600
1800
2000
2200
2400
1000
800
600
400
200
( AGE BOUNDARIES ARE TENTATIVE )
TD 2610 m
Sand : f – c grained.
Sand : f - m grained, loose.
Grey to dark grey shale with minor sandstone
Sandstone with streaks of limestone & shale.
Sandstone & shale with streaks of limestone.Shale : grey to dark greyLimestone with minor shale
Limestone with minor shale & marl
Coal : black
Shale with fragments of volcanic rocks
Clay / claystone : grey, fossiliferous.
Limestone with thin layers of shales
Oil & Gas Shows
Hyd
roca
rbon
s S
how
s in
man
y w
ells
in
adj
acen
t are
as
SAURASHTRA OFFSHORE BASIN
6. SOME OF THE INTERPRETED PLAY TYPES
A.) Structural Highs
B.) Porosity Pods in Tertiary Carbonates
100 200 300 400 500 600 700 800 900Line S-84
1.5
2.0
2.5
3.0
3.5
TWT
IN
SE
CS.
MID. MIOCENE
EARLY EOCENE TOP
WITHIN MIDDLE EOCENE
SPNW SE
Prospect P-1
S-84S-84
STRUCTURAL HIGH OVER HORST BLOCK ALONG LINE S-84
1.5
TWT
IN
SE
CS.
2.0
2.5
3.0
3.5
Line S-147
MID. MIOCENE
EARLY EOCENE TOP
WITHIN MIDDLE EOCENE
SNW NSESP
Prospect P-1
200 400 600 800 1000 1200
S-147S-147
STRUCTURAL HIGH OVER HORST BLOCK ALONG LINE S-147
GS-OSN-2003/1
SAURASHTRA OFFSHORE BASIN
BLOCK ON OFFER – CONTENTS
BLOCK : GS-OSN-2003/1
Definition of the Block
Geo-scientific Surveys
- Geophysical Survey
- Exploratory Drilling
Hydrocarbon Prospects
Expected Play Types
Data Package
LIST OF FIGURES
Description
Fig. 1 Index Map of Block GS-OSN-2003/1
Fig. 2 Bathymetry Map
Fig. 3 Bouguer Gravity Anomaly Map
Fig. 4 Magnetic Anomaly Map
Fig. 5 Seismic Coverage Map
Fig. 6 Seismic Section Along Dip Line S-82-1
Fig. 7 Seismic Section Along Strike Line ES-97-01
Fig. 8 Seismic Section Along Dip Line through Well EP-1
Fig. 9 Seismic Section Along Strike Line through Well EP-1 Fig. 10 TWT Map on Top of Basement
Fig. 11 TWT Map on Top of Early Eocene
Fig. 12 Prospects P-1 & P-2 at the level of Top of Early
Eocene
GS-OSN-2003/1
SAURASHTRA OFFSHORE BASIN
Fig. 13 TWT Map on a Horizon in Middle Eocene
Fig. 14 Prospect P-1 at a level in Middle Eocene
Fig. 15 TWT Map on a horizon in Middle Miocene
Fig. 16 Lithocolumn of Well EP-1
Fig. 17 Structural High over Horst Block Along Line S-84
Fig. 18 Structural High over Horst Block Along Line S-147
LIST OF TABLES
ANNEXURE
Annexure No. Description
I Contents of data package for the block GS-OSN-2003/1
Table 1 List of Seismic lines available for the block
Table 2 Acquisition & Processing Parameters for ONGC survey
S lines (1976, 80, 82 & 86 – 88)
GS-OSN-2003/1
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