Reconcavo Ing
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Brasil Round 4
Recôncavo Basin
Paulo de Tarso AraripeBlock Definition Superintendency
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RECÔNCAVO BASINLocation
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RECÔNCAVO BASIN
• Area: 10,200 km2
• Origin:• Related to the extensional forces that acted on
Gondwanaland during the Mesozoic. Represented in thesouthern part of the western branch of a Rift Valley systemlocated along the current Brazilian coastal region, thatpreceded the separation of the South American and Africanplates.
• Limits:• Separated from Tucano Basin to the N and NW by the Aporá
High and to the S, from the Camamu Basin by the BarraFault. Bounded to the E by the Salvador Fault.
Generalities
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RECÔNCAVO BASIN
History
• First Productive Basin in Brazil
Ø Exploration started: 1937Ø First discovery: DNPM No 163
Ø First productive well:Ø 1-L-3-BA (Lobato) - 1939
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RECÔNCAVO BASIN
Exploration History
• Available seismic (to Dec/2001): 2D: 11,613 km 3D: 4,085 km2
• Wells (to Feb/2002): Total wells drilled: 5,626 Exploration wells: 1,000 onshore
47 offshore
• Average: 1/1.8 km2
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RECÔNCAVO BASIN
Exploration Results:
• Oil and gas fields: 86• Volume in place: (Dec/2001):
Ø Oil: 954.29 MM m3 (6.001 BB bbl)
Ø Gas: 129.470 BB m3 (4.572 tcf)
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RECÔNCAVO BASIN
Volumes of HC
• Cumulative production (Dec/2001):Ø Oil: 222.11 MM m3 (1.396 BB bbl)Ø Gas: 53.845 BB m3 (1.901 tcf)
• Proved reserves (Dec/2001):
Ø Oil: 33.22 MMm3 (208.9 MM bbl)Ø Gas: 19.967 MMm3 (705.1 bcf)
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RECÔNCAVO BASINEvolution of the Volume of Oil in Place
Modif. from Figueiredo et al.,1989
1st Phase: (surface geology + analogue seismic + some gravimetry)
• Principal Fields:
Candeias (1941)Dom João (1947)Água Grande (1951) + 6 fields
42% of total (1989)
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RECÔNCAVO BASINEvolution of the Oil in Place Volume
Modif. from Figueiredo et al.,1989
2nd Phase:(surfacegeol.+conventional seismic-analog+ digital andgravim.).
• Main fields:Taquipe (1958)Buracica (1959)Araçás (1965)Miranga (1965)+ 31 other fields
• 50 % of total -1989
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RECÔNCAVO BASINEvolution of the Oil in Place Volume
Modif. from Figueiredo et al.,1989
3/4th Phases:(highresolution seismic + 3D)
• Principal fields:Riacho da Barra (1982)Faz.Bálsamo (1983)Rio do Bu (1984)Faz. Alvorada (1984) + 22 other fields
• 8% of total (1989)
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RECÔNCAVO BASINMain Structural Features
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RECÔNCAVO BASINBouguer Map
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RECÔNCAVO BASINStratigraphic Chart
ClasticsPRE-RIFT
LACU
STRE
RIFT
Clastics
ClasticsPOS-RIFT
Clastics andEvaporites
SAG
Modif. from Caixeta et al., 1993
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RECÔNCAVO BASIN
Modif. from Penteado, 1999
Schematic Geological Section
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RECÔNCAVO BASIN
Petroleum System
• Generation: Gomo/Tauá Mbs - Candeias Fm
• Reservoirs: Fluvial-eolian sands of the
Sergi and Água Grande Fms and turbidites of theCandeias, Marfim and Maracangalha Fms
• Seals: Overlying/intercalated shales• Traps: Stratigraphic, structural or mixed• Migration: Along fault planes or by direct
reservoir-source rock contact (Gomo)
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RECÔNCAVO BASIN
• Isopach map
Candeias Fm
Gomo Mb
• Observation:
Total thickness includescalcilutites and turbidites
Figueiredo et al., 1989
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RECÔNCAVO BASIN
• Geochemical log
Rift Sequence: Candeias Fm – Gomo Mb:
• TOC ave: 1- 2% (up to 10%)
• Generation Potential:
16 kg (up to 60 kg)HC/ton
• Hydrogen Index:
Up to 700mgHC/gTOC
• Kerogen: Type I
• Generation Index:Early Barremian to late Aptian
Petroleum System
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RECÔNCAVO BASIN
• Reservoir Quality
• Pré-Rift Sequence - Sergi Fm: Ô = 10 - 25 % K = 20 - 1200 mD - Água Grande Fm: Ô = 21 - 27 % K = up to 2,000 mD• Rift Sequence - Candeias Fm: Ô = 15 - 18 % K = 30 - 200 mD - Ilhas Fm: Ô = 18 - 24 % K = 30 - 300 mD
Petroleum System
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RECÔNCAVO BASIN
Mello et al., 1994
Petroleum System
• Event Chart
• Principal System:
CANDEIAS-SERGI (!)
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RECÔNCAVO BASIN
Composite Log and relative position between sourcerocks and reservoirs
Petroleum System
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RECÔNCAVO BASIN
• Trap model
Modif. from Braga et al., 1987
Petroleum System
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RECÔNCAVO BASIN
Eg.: Água Grande, Buracica and D. João fields
Play Pre - Rift
Santos & Braga, 1989
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RECÔNCAVO BASIN
Eg.: Candeias and Riacho da Barra fields
Play Rift - Candeias
Santos & Braga, 1989
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RECÔNCAVO BASIN
Eg.:Taquipe, Miranga and Araçás fields
Play Rift - Ilhas
Santos & Braga, 1989
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RECÔNCAVO BASIN
Oil and Gas
Fields
Source: Petrobras
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RECÔNCAVO BASIN
Relative distribution of oil
• pré-Rift Sequence:
Sergi and Água Grande Fms : 57%
• Rift Sequence:
Ilhas Fm: 27%
Candeias Fm: 16%
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RECÔNCAVO BASIN
BT - REC - 7
BT - REC - 8
BT - REC - 9
BT - REC - 10
Blocks for Bidding
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RECÔNCAVO BASINAvailable 2D Seismic on the blocks
Total: 3.064 kmTotal: 3.064 km
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RECÔNCAVO BASINAvailable 3D Seismic on the blocks
Total: 10.619 kmTotal: 10.619 km
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RECÔNCAVO BASINBT - REC - 7 - Location
Maracang., Marfim and Pojuca Fm sands
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RECÔNCAVO BASINBT-REC-7 - Seismic
2D seismic: (inclusive2D seismic: (inclusiveof part of BT-REC-8):of part of BT-REC-8):1,871 km1,871 km
Area: 161.93 km2Area: 161.93 km2Area: 161.93 km2
CexisCexis
LamarãoLamarão
CandeiasCandeias
CamaçariCamaçari
MapeleMapele
AratuAratu
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RECÔNCAVO BASIN
•• Lamarão Lamarão FieldField
Play Example
Modif. From Petrobras, 1997
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RECÔNCAVO BASINBT-REC-7 Wells
ExplorationExplorationwells:14wells:14
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RECÔNCAVO BASINBT- REC - 8 - Location
Maracang.,Marfim and Pojuca Fm sands
(Valang/Barrem)
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RECÔNCAVO BASIN
BT-REC-8 - Seismic
2D seismic: 1,871km2D seismic: 1,871km(includes part of(includes part ofBT-REC-7)BT-REC-7)3D seismic: 1,340 km3D seismic: 1,340 km
Area: 231.42 kmArea: 231.42 km
TaquipeTaquipe
MataMataS. JoãoS. João
LamarãoLamarão
S. PedroS. PedroMassapêMassapê
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RECÔNCAVO BASINPlay Example
Modif. From Petrobras, 1997
• Faz. Sori
Field
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RECÔNCAVO BASIN
BT-REC-8 - Wells
ExplorationExplorationwells: 23wells: 23
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RECÔNCAVO BASINBT - REC - 9 - Location
Turbid. and deltaics sands(Berriasian-Barrem.) of theCand./Marac., & Pojuca Fms
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RECÔNCAVO BASINBT-REC-9 - Seismic
2D seismic: 1,193 km2D seismic: 1,193 km((inclincl. BT-REC-10). BT-REC-10)3D seismic: 2,346 km3D seismic: 2,346 km
Area: 212.82 kmArea: 212.82 km22
SussuaranaSussuaranaRioRio Pojuca Pojuca
RiachoRiacho S. Pedro S. Pedro
FazFaz.. Gameleira Gameleira
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RECÔNCAVO BASINPlay Example
Modif. From Petrobras, 1997
Riacho de S. Pedro Field
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RECÔNCAVO BASINBT-REC-9 - Wells
ExplorationExplorationwells: 20wells: 20
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RECÔNCAVO BASINBT - REC - 10 - Location
Sands of the Sergi, Água Grande, Candeias,Maracang. and Pojuca
Fms (pre-Rift/Rift)
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RECÔNCAVO BASIN BT-REC-10 - Seismic
2D seismic: 1,193 km2D seismic: 1,193 km(includes BT-REC-9)(includes BT-REC-9)
3D seismic: 6,933 km3D seismic: 6,933 km
Area: 312.95 kmArea: 312.95 km22
MirangaFaz.Belém
ÁguaÁguaGrandeGrande
BiribaBiriba
ApraiúsApraiús
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RECÔNCAVO BASINPlay Example
Modif. From Petrobras
Apraiús/Lagoa do Paulo Field
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RECÔNCAVO BASIN
Riacho da Barra Field Play Example
Modificado from Figueiredo et al.,1989
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RECÔNCAVO BASIN
BT-REC-10 - Wells
Exploration wells:Exploration wells: 54 54
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Statistical Data
• Major Brazilian petroleum producingbasin over four decades
• High index of recoverable oil:
21,100 m3 (132,500 bbl)/km2
RECÔNCAVO BASIN
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RECÔNCAVO BASIN
Semi-Mature Stage ofExploration!
(Andrade, 1989)
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BACIA DO RECÔNCAVO
Andrade’s opinions in 1988
“- The Recôncavo Basin is in a semi-mature stage of
exploration
- There are several possibilities for oil & gas in
specific areas of the basin
- New discoveries depends on increased quality of seismic in less drilled areas - Search for mixed, stratigraphic and nonconventional traps shall be considered
- Enhance the use of new tecnologies and new
exploratory concepts”
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BACIA DO RECÔNCAVO
• Wells drilled (1988-2001): 873
• Wells completed (oil and gas - 2000): 108
• Total oil production (1988-2000):37.621 MM m3
• Proved reserves (2000):33.350 MM m3
• Reserves “incorporated” between 1988-2000:
15.407 MM m3
The example of Recôncavo
EXPLORATION HISTORY
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BACIA DO RECÔNCAVO
“- Gulf Coast Region has’nt reached yet its full potential
- There are several untested possibilities for oil & gas
- Total of wells drilled, only in TX & LA, surpasses
820,000 (1/km2)
- New discoveries depend principally on increased
seismic activities, exploratory drilling and new
geologic concepts“
Halbouty’s opinions in 1988
The example of TEXAS
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RECÔNCAVO BASIN
• Wells drilled (1988-2001): 140,488• Wells completed (oil and gas - 2000): 114,265• Total oil production (1988-2000): 7.141 BB bbl• Proved reserves (2000): 5.273 BB bbl• Reserves “incorporated” (2000): 335 MM bbl
Source: Railroad Comission
The example of TEXAS
EXPLORATION HISTORY
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Minimum Exploration Program
100
2
2
1,0Value of Financial Guarantee (US$MM)
WORK AND INVESTMENT PROGRAM
First period (km of seismic 2D)
Second period (number of wells)
Third period (number of wells)
Exploration Period Duration (years)Obligatory
Relinquishment (%)
First period 3 50
Second period 2 25
Third period 2 25
RECÔNCAVO BASIN
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Thank you for your attention
RECÔNCAVO BASIN