a review of the geology and petroleum systems in the eastern gulf of guinea, west africa
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A Review of the Geology and Petroleum Systems in the Eastern Gulf of Guinea, West Africa. Richard Bray Exploration Consultants Limited. Exploration Consultants Limited, Highlands Farm, Greys Road, Henley-on-Thames, Oxfordshire, England. Location Map. Slide 1. Discovery History. Slide 2. - PowerPoint PPT PresentationTRANSCRIPT
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A Review of the Geology
and Petroleum Systems
in the Eastern Gulf of Guinea,
West Africa
Richard Bray
Exploration Consultants Limited
Exploration Consultants Limited, Highlands Farm, Greys Road,Henley-on-Thames, Oxfordshire, England
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Location Map
Slide 1
Dakar
Banju l
Bissau
Conakry
Freetown
Monrovia
Abi djan Accra
Portnovo
PortHarcourt
Y aounde
Kribi
Malabo
Librevi lle
Port Gentil
Sette Cama
Brazzaville
Luanda
Windhoek
Lüderitz
GHANA
M AUR IT
SENEGAL
CÔTED’IVOIRE
BENIN NIGERIA
CAMEROON
EQUATORIALGUINEA
GABON CONGO
D. R. CONG O
ANGOLA
NAMIBIA
Espoir30 mmbbls
Zafiro>500 mmbbls
N’Kossa>200 mmbbls
Benguela Complex>2 billion bbls
Erha1 billion bbls
Bonga750 million bbls
Agbami1 billion bbls
Ceiba>200 mmbbls
Girassol/DaliaComplex> 2 billion bbls
Kizombo Complex>1.5 billion bbls
Kuito>2 billion bbls
Deep Water Discovery
Deep Water Production
Boabab
Akpo1 billion bbls
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Slide 2
Discovery History
YEAR
0
1000
MMbo
recoverable
2000
3000
4000
1990 1980 1970 1960 1950 1940
Deep waterplays
Conventionalplays
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Slide 3
EasternGulf of GuineaHydrocarbonOccurrences
Ilha de Príncipe
llha de São Tomé
GABON
CAMERO ONNI GERIA
SAOTOME
oil seeps
oil seeps
SanagaSud
Ceiba
AlbaZafiro
Kribi
Okume
kilometres0 200
5°E
0°
10°E
5°N
Isla deAnnobón
llha de São Tomé
SAO TOME
kilometres0 200
5°E
0°
5°S
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Salado
Orange
Puntadel Este
Lüderitz
Pelotas
Walvis
Santos
Namibe
Campos
Kwanza
EspiritoSanto Lower
Congo
Almada
BahiaNorte
Reconcavo
PortugarDouala
Sergipe-Alagoas
Gabon
WestAfrica
South America
Walvis Ridge
Recife
Rio MuniPlate edge
Present-daycoastline
Basins
30°S
60°W
Slide 4
Early Cretaceous Reconstruction
AFRICASOUTH
AMERICA
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Slide 5
South Atlantic Mesozoic Basins
BenueTrough
IvoryCoastBasin
NigerDelta
GabonBasin
DoualaBasin
CongoBasin
AngolaBasin
PelotasBasin
SantosBasin
Campos Basin
Jequitinhonha,Espiroto Santo
Basins
Bahia Sul Basin
Sergipe-AlagoasBasin
MaranhaoBasin
R-T-JGrabens
ParanaBasin
Portugar Basin
0°30°W
40°S
20°S
0°
20°N
J.B. Meyers et al, 1996
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Slide 6
Regional Tectono-stratigraphy
?
CHRONOSTRATIGRAPHY
SAN.CON.
PLI-HOL
PRECAMBRIAN
TECTONOSTRATIGRAPHY
GABONBASIN
RIO MUNIBASIN
DOUALABASIN
? ? ?
BENUETROUGH /
NIGER BASINTECTONIC EVENTS
DRIFT II
TRANSITIONAL
RIFT III
RIFT II
RIFT I
DRIFT III
MIDTERTIARYUPLIFT
LATETERTIARYUPLIFT
sliding
NIGER DELTA
BUILD-OUT
Santonian tectonicevent - uplift,sliding
early sliding
SALT
MOVEMENT
RIFTING
DRIFT I
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Slide 7
Cross-section of Margin Evolution - 1
LATE APTIAN
EARLY SEPARATION
LATE SEPARATION
ALBIAN-CENOMANIAN
Oceaniccrust
Sheared-margincrust
Break-upunconformity
Salt basin
Magmaticunderplating?
LATE ALBIAN UPLIFT
Upper-levelsliding
ContinentalCrust
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Slide 8
Cross-section of Margin Evolution - 2
LATE SEPARATION
SANTONIAN
UNCONSTRAINEDOPENING
MIOCENE -QUATERNARY
Senonianunconformity
Growthsequence
Onlappingsequence
Lower-levelsliding
MioceneunconformityLate sliding
MID & LATE TERTIARY, & QUATERNARY UPLIFT
LATE CRETACEOUS UPLIFT
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Slide 9
EasternGulf of GuineaGeologicalSetting
Isla deAnnobón
Ilha dePríncipe
llha deSão Tomé
GABON
CAMEROONNI GE RI A
SAOTOME
5°E
0°
10°E
5°N
0 200kilometres
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Slide 10
Petroleum
Systems
Gabon Basin Rio Muni Basin
SAN.CON.
PLI-HOL
PRECAMBRIAN
SAN .CON.
PLI -HOL
PRECAMBRIAN
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Slide 11
Petroleum
Systems
Douala/Kribi-Campo Basin
Niger Delta
?
SAN.CON.
PLI-HOL
PRECAMBRIAN
? ? ?
SAN.CON.
PLI -HOL
PRECAMBRIAN
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Slide 12
EasternGulf of GuineaPetroleumSystems
CAMERO ONNI GERIA
GAB ON
SAOTOME
NGOLO
IKIJA-1
DORO
NNWAUKOT
ZAFIRO
ISONGOALBA
CEIBA
AGBAMI
AKPO-1
Port Harcourt
Bata
Libreville
Malabo
Ilha de Príncipe
llha de São Tomé
oil seeps
oil seeps
Ceiba
AlbaZafiro
Okume
Agbami
Akpo SanagaSud
Kribikilometres0 200
5°E
0°
10°E
5°N
Late TertiarySource Kitchen
Area Sourced fromLate Tertiary Kitchen
Mid CretaceousSource Kitchen
Area Sourced fromMid Cretaceous Kitchen
Early CretaceousSource Kitchen
3
2
1
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Slide 13
Rio Muni-Cameroon Cross-section
West East
Early Cretaceoussource rocks.
Mid-Cretaceoussource rocks
NEOGENE
Ceiba
TOE THRUSTFAIRWAY
Miocenesource rocks
TERRACE UPLIFT
COMPLEX
DEEP WATER FAN/CHANNEL DEVELOPMENTSGRAVITY SLIDING ALONG SLOPE
BASIN SLOPE PLATFORM
Kribi-Sanaga SudFields
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Slide S1
Northern Rio Muni, Seismic Section
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Slide S2
Rio Muni, Seismic Section
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Slide 14
Northern Equatorial Guinea - Northern CameroonCross-section
Shale diapir-associatedstructures
Benin
Moudi
Tsavorita
UPPER QUA IBOE
LOWERQUA IBOE
Zafiro
Amatista
AKATA
ISONGO
Alba
BONITO
AKATA
LATE CRETACEOUS
OCEANIC CRUST
SOUELLABA
LOGBABA
OCEANIC CRUST
Toe-thruststructures
Oil migrating fromCretaceoussource rocks
Deep water sands
Oil seeps associated withCretaceous exotics
Cameroon Volcanic Line
Isongo
Post-rift Marine(Albian-Turonian)
N i g e r D e l t a - R i o d e l R e y B a s i n Douala Basin
North-west South-east
MATANDA
LOGBADJECK
WOURI
Channel/fan sands
CONTINENTAL CRUST
S anaga Delta
MUNDECK
Apt-AlbianSource RocksPost-rift SRs
Albian-Cen
N I G E R I A E Q U AT O R I A L G U I N E A C A M E R O O N
M’Via
Matanda
Souellaba
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Slide S5
Offshore Bioko, Seismic Section
North-west South-east
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Slide S6
Regional Seismic Section
ALBAFM.
QUAIBOE FM.
PLIOCENE
ISONGO FM.
(MIOCENE)
Base Tertiary?
WOURI
FM.
SOUELLABA
FM.
LOGBABA-
LOGBADJECK
FM.
MUNDECK
FM.
Base Pliocene
Base Miocene
Senonian Unc.
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Slide 15
• Abundant, rich, oil-prone source rocks
• Thick, clean turbidite sands
• Structural & stratigraphic traps
• Late/ongoing hydrocarbon generation
KEYS TO THE WEST AFRICA
DEEP WATER PLAY
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Slide 16
Eastern Gulf of GuineaOpen Deep WaterAcreage, 2001
7°E 8°E 9°E 10°E
4°N
3°N
2°N
1°N
NIGERIACAMEROON
Ilha de Principe
Riomuni
GABON
Corisco
SAOTOME
Equatorial GuineaOpen Deep WaterAcreage
Newly allocatedblocks in 1999Deep WaterLicence Round
Deep Water Cameroonblocks awarded 2001
Currently licensed blocks
Currently open acreage
0 200kilometres
Isla deAnnobón
llha de São Tomé
0 200kilometres