SENEGAL BASINS POTENTIAL & ACREAGE By Mrs Nd. Rokhaya. Diallo Manager Basin Geology Petrosen AAPG 2010 NEW ORLEANS LA 1
LOCATION AREA : 196 192 Km 2 POPULATION : ~12 000 hbts DENSITY: 51 h / Km 2 GNP : 1110 $ Dakar AAPG 2010 NEW ORLEANS LA 2
REGIONAL SETTING NW African coastal basin the MSGBC Mesozoic-Cenozoic passive margin basin overlying a Paleozoic basin no wells in deep water AAPG 2010 NEW ORLEANS LA 3
RESERVOIRS & SEALS • Upper Devonian shales • Devonian sandstones : fine to coarse grained, often oolithic with porosities ~ 15% - 20%. • Upper Tertiary shaly sequences • Ordovician sandstones : no primary porosity, but • Lower Tertiary clastics and carbonates intensely fractured, good secondary porosity having excellent deliverabilty • Upper Cretaceous sands and shale sequences • Jurassic - lower Cretaceous carbonate section AAPG 2010 NEW ORLEANS LA 4
SOURCE ROCKS & MATURATIONc Best source rocks Cenomanian-Turonian and Albian • in CM-7 Cenomanian level at 2608 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 2010 NEW ORLEANS LA 5
SOURCE ROCKS & MATURATION Silurian shales : best regional source rocks TOC ~ 1% - 3% Ro ~ 0. 95 - 1. 3 AAPG 2010 NEW ORLEANS LA 6
HYDROCARBON OCCURRENCES & PRODUCTIONc TERTIARY MIOCENE T 020 T 030 OLIGOCENE EOCENE P F G VG Ref. Well TESTED RESERVOIR FIELD (or Reference Well) Dakar Canyon PLIO-RECENT SOURCE 3 D SEISMIC PICKING T 040 T 060 T 080 Upper Miocene unc. Lower Miocene unc. SLOPE DEPOSITS AND CONFINED TURBIDITES CHINGUETTI, THIOF, BANDA Oligocene unc. DOME FLORE, DOME GEA OPEN MARINE CARBONATES T 090 CRETACEOUS PALEOCENE MAASTRICHT. K 090 CAMPANIAN K 100 SANTONIAN K 110 TURONIAN K 110 a K 120 CENOMANIAN K 130 APTIAN JURA NEOCOMIAN MALM Top Neocomian Lmst DIAM NADIO GADIAGA DELTAIC AND SHALLOW MARINE CLASTICS Senonian unc. Turonian transgression RF 3 - (CVM 1) CM 10 PROGR. CARB. PLATFORM MIXED SYSTEMS DELTAIC VS CARBONATE PLATFORM Aptian transgression ALBIAN PELICAN SLOPE DEPOSITS AND CONFINED TURBIDITES K 070 FAUCON ? - (CVM 1) FAUC. JAMMAH 1 - (CVM 1, FAUCON) DSDP 367 DKM 2, RF 2 SHALLOW TO OPEN MARINE CARBONATES DKM 2 ? ? ? Gas Condensate Oil DOGGER AAPG 2010 NEW ORLEANS LA 7
HYDROCARBON OCCURRENCES & PRODUCTION • Diam Niadio field • Gadiaga field • Dome Flore & Gea fields AAPG 2010 NEW ORLEANS LA 8
HYDROCARBON OCCURRENCES & PRODUCTION Gadiaga field • ~ 95 000 Nm 3 ( 3. 325 BCF ) producing since Oct 2002 Diamniadio field • 217 393 033 Nm 3 (7. 6 Bcf) from 1987 to 2000 • 62 642 bbs light oil 34° API • 35 692 bbls condensate ANNEE Octobre 2002 2003 2004 2005 2006 2007 2008 2009 PRODUCTION DE GAZ (Nm 3) 3 379 431 12 637 561 15 101 900 15 936 769 12 225 816 10 865 236 6 796 073 17 114 983 CUMUL (Nm 3) 3 379 431 16 016 992 31 118 892 47 055 661 59 281 477 70 146 713 76 942 786 94 057 769 2009 : 17 114 983 Nm 3 (~600 mmscft) 759 bbls condensate AAPG 2010 NEW ORLEANS LA 9
DOME FLORE & GEA Heavy Oil in Oligocene limestones ( 10 – 13 ° API ~ 1 Bbls ) Light Oil Maestrichtian ( 33° API ) Oil shows in Miocene & Albian sands Flore & Gea fields AAPG 2010 NEW ORLEANS LA 10
GAS TRANSPORT NETWORK Gadiaga field - 34 km - - 10 km - - 9 km Kabor storage and epuration station Cement plant Gas Turbine at Cap des Biches AAPG 2010 NEW ORLEANS LA 11 11
CONTRACT AREAS Licenses q 3 PSC offshore q 3 PSC onshore q 5 Companies q 5 blocks under negotiation q 5 open blocks offshore q 3 open blocks onshore AAPG 2010 NEW ORLEANS LA 12
REVIEW OF RECENT EXPLORATION ACTIVITIES AAPG 2010 NEW ORLEANS LA 13
SEBIKHOTANE Avril 2003 DN-15 B in 2006 commitment : 2 exploration wells Konkorong-1 Baobab-1 AAPG 2010 NEW ORLEANS LA 14
TAMNA 6 wells drilled the last two years Gas in Lower Senonian sands connected to transport system ~64 000 Nm 3 to SOCOCIM cement plant presently ~ 300 000 Nm 3 / day possible delivery to SENELEC power plant October 2006 AAPG 2010 NEW ORLEANS LA 15
SAINT LOUIS offshore 60 % 30 % 10 % • Structural/Stratigraphic traps west of the Cayar fault zone; granted 2003 • Structural traps within the Cayar fault zone; 1200 km 2 D Juillet 2004 • Turbidites/mas flow deposits west the Cayar fault zone AAPG 2010 NEW ORLEANS LA 16
Acquisition 620 km 2 of 3 D in March-April 2008 Ibis & Flamengo leads AAPG 2010 NEW ORLEANS LA 17
SAINT LOUIS offshore profond • 1500 Km 2 D • high frequency airmag survey 4225 Km 2 5695 line Kms • Satellite seep study • economic evaluation (1. 5 TCF) AAPG 2010 NEW ORLEANS LA 18
CAYARS offshore blocks ~ 1690 km 2 D on March 2006 Airmag survey March 2007 AAPG 2010 NEW ORLEANS LA 19
CAYARS offshore blocks December 2008 AAPG 2010 NEW ORLEANS LA 20
RUFISQUE offshore profond 2088 Km 2 D Nov/Dec 2004 1500 km 2 3 D Jan/ Feb 2007 Relinquished by Edison/Petrobras AAPG 2010 NEW ORLEANS LA 21
SANGOMAR - RUFISQUE 90 % 10 % 2050 km 2 3 D ( Feb - Mar 2007 ) November 2004 AAPG 2010 NEW ORLEANS LA 22
plays & leads L Cretaceous Carbonate shelf Margin play Top Aptian 3 D line 1541 Senonian Unconformity Depth Albian Buried hills 3 D Lin e 907 6 Santonian fans N Slope fan play N 3 d Line 9076 Depth High amplitude Upper slope Fan complexes S S Albian Prospective dip closed Interval Top A ptian Neocomia n Senonian Unconformity Turonian 3 d Line 1541 Depth AAPG 2010 NEW ORLEANS LA 23
SENEGAL OFFSHORE SUD q About 10 000 km of 2 D from 1973 et 2001 q 8 wells AAPG 2010 NEW ORLEANS LA 24
PALEOZOIC Bassins intracratoniques BASIN q Prospective Area : East Meridian 16° q Surface : environ 60 000 km² q Two sub-basins East Meridian 15° AAPG 2010 NEW ORLEANS LA 25
PALEOZOIC BASIN AAPG 2010 NEW ORLEANS LA 26
SENEGAL EAST AREA 2 bassins L 1 et L 2 identified 190 km Basin L 3 H 1 Di. F-1 H 2 Kr. F-1 Basin L 1 Ni. F-1 Basin Landsat 7 ETM+ ERS SAR L 4 H 3 Ta-2 Basin L 2 H 5 L 5 H 4 Db-1 AAPG 2010 L 6 NEW ORLEANS LA 27
PETROLEUM LEGISLATION LEGAL AND FISCAL TERMS AAPG 2010 NEW ORLEANS LA 28
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: 10+10 years AAPG 2010 NEW ORLEANS LA 29
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 2010 NEW ORLEANS LA 30
PETROSEN’S PARTICIPATION § Exploration phases: Carried Interest of 10 % § After Commercial discovery: Working Interest up to 20 % FISCAL REGIME Twenty five per cent (25%) Income Tax ( applied on net profit ) AAPG 2010 NEW ORLEANS LA 31
THANK YOU • Senegal Basin has generated oil and gas Diamniadio, Gadiaga and Casamance Dôme Flore • 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 • 60 000 km 2 underexplored Paleozoic basin with good reservoirs in Ordovician and Devonian and good source in Silurian, and traps and plays identified Law with flexible terms AAPG 2010 NEW ORLEANS LA 32
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