1. AAPG DENVER THE SENEGAL BASIN EXPLORATION PRODUCTION & OPPORTUNITIES
7-10 JUNE 2009
By Ndèye Rokhaya DIALLO
Basin GeologyDivision Manager

2. SENEGAL AREA : ~ 200 000 km2 POPULATION : ~12 000 000
DENSITY: 51 h / Km2
GNP : $ 1110
AAPG DENVER June 09

3. REGIONAL SETTING The Senegal basin occupies central
part of the NW African coastal basin called the MSGBC
(Mauritania – Sénégal – Gambia –Guinea Bissau – Conakry).
km²
( Km² offshore)
AAPG DENVER June 09

4. LITHOSTRATIGRAPHIC COLUMN OF SENEGAL BASIN
Mesozoic-Cenozoic
Passive margin Basin
overling a Paleozoic basin
Post-rift stage
Mid Jurassic-Actual
Syn-rift stage
Permo Triassic- lower Jurassic
Pre-rift stage
Upper Proterozoic-Paleozoic
AAPG DENVER June 09

5. RESERVOIRS AND SEALS Upper Tertiary shaly sequences;
Lower Tertiary clastics and carbonates;
Upper Cetaceous sand shale sequence;
Cenomanian-Turonian shales;
Jurassic - lower Cretaceous carbonate section;
AAPG DENVER June 09

6. SOURCE ROCK AND MATURATION
Best source rocks in
Cenomanian-Turonian and Albian
in CM-7
Cenomanian level at m with
TOC = 8.72 %
HI = 660 mg/g
in CM-10
Turonian level at 2554 m with
TOC = 5.25 %
HI = 638 mg/g .
AAPG DENVER June 09

7. EXPLORATION HISTORY 1952 - 2008 52 500 km of 2-D seismic76
puits
km of 2-D seismic
7 200 km² of 3-D seismic
135 exploration wells
(1 well per km²)
only ~ 30 wells can be considered as significant Exploration Wells
no wells in deep waters
AAPG DENVER June 09

8. HYDROCARBON OCCURENCIES AND PRODUCTION
Diamniadio Field
bbls Light oil 34° API,
bbls condensate
Nm3 (7.6 Bcf) natural gas.
Gadiaga Field 2008
- About Nm3 ( 2.54 Bcf ) natural gas
- 749,12 Barrels condensate
Dome Flore & Gea fields (1967)
- Heavy Oil in Oligocene limestones
( 10 – 13 ° API ~ 1Bbls)
- Light Oil Maestrichtian / Albian sands
( 33° API )
AAPG DENVER June 09

9. GAS PIPELINE NETWORK Gadiaga field Kabor storage and epuration station
Gas Turbine at Cap des Biches
34 km
- 10 km
- 9 km
AAPG DENVER June 09

10. EXPLORATION ACTIVITIES
- 8 licences
- 9 companies
MAUREL & PROM
FORTESA
TULLOW ( E A ) – DANA
EDISON - PETROBRAS
FAR - SHELL
ORANTO PETROLEUM
Onshore
4 open blocs
Offshore
7 open blocs
AAPG DENVER June 09

11. TAMNA PERMIT
October %
6 new producing wells drilled ( )
Certified Reserves : Bcf
– In 2002, one producing well Gd-2 ~ 1,050,000 cubic feet/day;
- In 2009, Production capacity increased to 10,500,000 cubic feet/day (new wells Sa-3, Sa-3a, Sa-4 et Sa-5 Sa-2, Sa-1B).
Current phase is development of Gadiaga –Sadiaratou field
Acquisition of 2000 km 2D Seismic lines to cover the onshore carbonate platform deep target. t
AAPG DENVER June 09

12. SEBIKHOTANE PERMIT Granted on April 2003 84.375% 15.625%
84.375% %
Oil and gas have been produced from1986 to 2000 in Diam Niadio-Kabor field
D reinterpretation defined 5 new prospects
Two Prospects to be drilled in 2009 Baobab & Konkorong
Target : Upper Cretaceous sands
Estimated reserves : 26 & 100 BCF
Main structural elements in the Area
AAPG DENVER June 09

13. SAINT LOUIS OFFSHORE PERMIT
Granted on 2003
60%
30%
10%
1233 km 2-D lines acquired in 2006
Several interesting leads & prospects identified
(Ibis, Flamingo, Fish Eagle, Vulture )
620 km² of 3-D seismic acquired over Ibis & Flamingo prospects in 2008;
1700 km of 2-D Infill lines west of the permit and G&G evaluation planned in 2009.
Play types:
Shelf plays, Slope channel plays, Base slope channel plays, Counter Regional Fault Plays
Shelf plays
Slope channel plays
AAPG DENVER June 09

14. CAYAR OFFSHORE PERMIT Granted on December 03rd 2008 90 % 10 %
90 % %
Work Program for the first period (3 years) is mimimum 500 sq km 3-D
Gainde prospect (130 km²).
Post Maastrichtian channel
TOP MAASTRICHTIAN DEPTH MAP
Upside case
Average WD : 200m
Width : km
Length : km
Surface area : km2
Vertical closure : 40 – 120 m
GAINDE PROSPECT
AAPG DENVER June 2009
AAPG DENVER June 09 14

15. RUFISQUE DEEP OFFSHORE PERMIT
Granted August 2004
55%
40% 5%
2088 Km of 2D seismic lines;
1500 km2 of 3D data acquired on 2007;
along with Gravity and Magnetic data ;
Play types :
Miocene slope channels play, Cretaceous turbidite wedges, and slope channels plays
Estimated Reserves Total Albian OOIP from 500 to 4000 mmstb
Current status ; looking for a 3rd partner before drilling a deep well
A 3D cube of the 2007 survey a
Oil shows at RF-3 ( 33°API )
in Senonian sands
Oil and Gas shows at RF-2 and DKM-2
in Aptian/Neocomian
AAPG DENVER June 09

16. RUFISQUE OFFSHORE & SANGOMAR OFFSHORE
granted November 2004
Farm out January 2009
(90%)
2050 km² of 3-D Seismic acquired in 2007
Play & Leads :
Lower Cretaceous Carbonate shelf Margin play, Slope fan play
Sea bed logging shut by EMGS in May 2009 and Financed by
Santonian upper slope
Stacked fans exhibiting
High amplitudes
10 km
Water depth meters
3D outline
South
channel
complex
Mid channel complex
North channel complex
Closure
At top
Aptian At
Top
Neocomain
Albian
Subcrop
closure
Lower Cretaceous
Carbonate shelf Margin
structural closures
AAPG DENVER June 09

17. 1 Dome flore (Sterling Energy plc, Markmore, AGC)
Managed by the AGC
Two permits:
1 Dome flore (Sterling Energy plc, Markmore, AGC)
- Heavy Oil in Oligocene limestones
( 10 – 13 ° API ~ 1Bbls )
- Light Oil Maastrichtian / Albian sands
2 AGC profond (Ophir Energy plc)
AAPG DENVER June 09

18. Saint Louis offshore Deep Cayar offshore Deep
OFFSHORE OPEN BLOCKS
Saint Louis offshore Deep
Cayar offshore Deep
1690 km 2D on March 2006
Aeromagnetic survey
- Upper Cretaceous play
(Two Prospects)
1 Guelem prospect (116 km²)
2 NE Guelem prospect (114 km²)
1500 Km 2D
high frequency airmag survey
Two prospects:
1 Saint Louis A
2 Saint Louis B
Intra Cretaceous Depth Map
C.I.: 10m
10 Km
Average WD : 1700m
Main target : Cretaceous
Width : 9.5 km
Length : 15 km
Surface area : 120 km2
Vertical closure : 150 m
Satellite seep study
economic evaluation
Guelem is a 4 way dip closure
10 km wide x 13 km long
AAPG DENVER June 09

19. SENEGAL OFFSHORE SOUTH & SENEGAL OFFSHORE SOUTH DEEP blocks
PLAY CONCEPT
(1) Salt Flank Play
(2) Shelf Edge Play
(3) Carbonate Shelf Margin
(4) Shelf Edge Onlap Wedge
1919
Neocomian
Aptian
Albian
Jurassique
Triassic - Early Jurassic
Early Senonian
Maastrichtian
Post-Paleocene
Basement 1 2 4 3 5 6 7 8 km
(1) Salt Flank Play
(2) Shelf Edge Play
(3) Carbonate Shelf Margin
(4) Shelf Edge Onlap Wedge
(1)
(2) W E
(4) 10
-Paleocene
Campanian
(3)
Cenomanian
Turonian
Depth
AAPG DENVER June 09

20. ONSHORE BLOCKS, THE PALEOZOIC BASIN
Underly the Meso Cenozoic passive margin Basin
Acreage : ~ km²
LOUGA
DIOURBEL
SALOUM
SENEGAL ONSHORE SUD
AAPG DENVER June 09

21. Two tectonic styles
compressional regime in the rest of the Senegal basin resulting from the
combined effect of Caledonian and
Hercynian orogenies
Extensional system in Eastern Casamance in which a pre-hercynian structural style of Horsts and Grabens and tilted fault blocks was preserved
AAPG DENVER June 09

22. RESERVOIRS AND SEALS Possible Permo-Carboniferous sediments
Upper Devonian shales
Lower Devonian sandstones,
(porosities %)
Silurian shales
Interbedded shales
Ordovician sandstones with secondary porosity and permeability due to fracturing
AAPG DENVER June 09

23. SOURCE ROCK AND MATURATION
Silurian shales :
best regional source rocks TOC ~ 1% - 3%
Ro ~
Oil windows should occur
between 1850/2400 m to 3400/4000 m
AAPG DENVER June 09

24. TRAPS AND PLAYS - 5630 km 2D in Louga, Diourbel, Saloum
km 2D in Senegal Onshore Sud ;
15 anomalies distributed at depth ranging from 2,600 to 5,700 m of Ordovician to Carboniferous age.
Trapping :
trusted anticlines, complex faulted anticlines,
four way closures, tilted fault blocks.
Seismic Line DL
AAPG DENVER June 09

25. SALOUM & SENEGAL ONSHORE SUD PERMITS
ONSHORE OPEN BLOCKS
1 - LOUGA
Acreage : km2
7 wells (1 well per 3857 km2 )
2 - DIOURBEL
Acreage : km2
3 wells (1 well per km2)
3- THIES and MBOUR
THIES: km2
MBOUR : 1380 km2
Paleozoic " A prospect "
SALOUM & SENEGAL ONSHORE SUD PERMITS
Granted on December 03th, 2008
Saloum Work Commitment:
Minimum 750 km of 2D Seismic line
Minimum 660 km² of 3D Seismic
2 exploration wells
Senegal Onshore Sud Work Commitment:
Minimum 450 km of 2D Seismic line
Minimum 400 km² of 3D Seismic
2 exploration wells
AAPG DENVER June 09

26. PETROLEUM LEGISLATION
LEGAL AND FISCAL TERMS
AAPG DENVER June 09

27. LAW N° 98-05 of January 08, 1998 (PETROLEUM CODE)
PRODUCTION SHARING CONTRACT (PSC)
EXPLORATION
Initial Period: 3-4 years
Renewal Periods: 2-3 years
EXPLOITATION PERIOD
Initial Period: 25 years
Extension Periods: years
AAPG DENVER June 09

28. EXPLORATION WORK PROGRAM & EXPENDITURE OBLIGATIONS
to be negotiated
RETENTION PERIOD
If a discovery is certified non commercial, Contractor may be granted a Retention Period of maximum:
3 years for crude oil
8 years for natural gas
AAPG DENVER June 09

29. PETROSEN’S PARTICIPATION
Exploration phases: Carried Interest of up to 10 %
After Commercial discovery: Working Interest up to 20 %
FISCAL REGIME
Twenty five per cent (25%) Income Tax
( applied on net profit )
AAPG DENVER June 09

30. MAIN CONCLUSIONS
Senegal Basin has generated oil and gas: Diamniadio, Gadiaga and Casamance
Dôme Flore fields;
Presence of world class source rocks in Turonian-Cenomanian, secondary good
sources in Albo-Aptian and Jurassic;
Petroleum system in Deep water with various structural trends and traps;
km2 of underexplored Paleozoic basin with good reservoirs in Ordovician
and Devonian, and good source in Silurian, traps and plays identified.
Law with flexible terms
AAPG DENVER June 09

31. THANK YOU
AAPG DENVER June 09