PELOTAS Basin

Brasil Round 4
Pelotas Basin
Orivaldo Bagni
Block Definition Superintendency
PELOTAS BASIN
• Presentation
Ø Location
Ø Generalities
Ø Tectono-stratigraphic evolution
Ø Petroleum System
Ø Blocks for Bidding
PELOTAS Basin
Location Map
Area of the basin: 210,000 km2
Wells: 20 (9 wildcats)
PELOTAS BASIN
• Generalities
Ø Area: 210,000 km²
Ø Boundaries: - Uruguai geographic boundary
- Florianópolis High (Santos Basin)
Ø Exploratory wells: 20 (9 wildcats)
PELOTAS BASIN
• Tectonic-stratigraphic evolution
Ø Pre-rift: Paleozoic of Parana Basin
(onshore well: 2-TO-1-RS)
Ø Rift: -Neocomian basalts (Imbituba Fm).
-Barremian Sequence (Cassino Fm).
(Continental seq in the well 1-RSS-3)
-Antithetic faults system.
Ø Post-rift: Starting in Aptian. Underdevelopment
adiastrophic tectonic.
PELOTAS BASIN
• Tectonic-stratigraphic evolution
Ø Post-rift: Principal Sequences.
– Aptian-Albian sequence (Ariri Fm).
Evaporites in the well 1-SCS-3.
– Late Albian to Maastrichtian sequence (Atlântida,
Tramandaí, Cidreira and Imbé Fms).
Beginning of thermal subsidence of the basin.
– Paleocen to Recent sequence (Cidreira and Imbé Fm).
Deposition of fine clastics, except in the Mostardas Low.
Significant Gravity Tectonics (shale diapirs) in the Rio
Grande Cone (Listric faults, folders and thrust faults).
PELOTAS BASIN
Stratigraphic Chart
PELOTAS BASIN
Schematic Geological Section
PELOTAS BASIN
• Petroleum System
Ø Source Rocks
Ø Reservoirs Rocks/Seals
Ø Principal Plays
Ø Generation/Maturation
Ø Migration/Trapping
PELOTAS BASIN
Petroleum System
• Source rocks
Ø Permian shales of the Irati Fm.
Ø Barremian lacustrine shales of the rift phase.
Ø Cenomanian/Turonian shales (2-BPS-6).
Ø Tertiary shales of the Imbé Fm (“Cone”).
PELOTAS BASIN
Petroleum System
• Potential reservoirs
Ø Imbé Fm turbidites (Eocene/Oligocene).
Ø Imbé Fm sandstones in the area of the
“Cone” (Miocene/Pliocene).
Ø Possible reservoirs of the Rift Phase
(Neocomian/Barremian).
• Cap rocks
Ø Cretaceous and Tertiary shales.
PELOTAS BASIN
Petroleum System
• Migration
Ø Rift – direct contact.
Ø Drift – unconformity surfaces, listric faults
(“Cone” area).
• Trapping
Ø Structural
Ø Stratigraphic
Ø Mixed (“Cone” area)
PELOTAS BASIN
Block for bidding
•
New Frontier Block
Ø BM-P-1
•
Regional Data:
Ø 2D seismic: 4,448 km
Ø Wells: 6
PELOTAS BASIN
Regional Seismic and Wells
PELOTAS BASIN
Structural Framework
PELOTAS BASIN
2D Seismic: BM-P-1
PELOTAS BASIN
Wells: BM-P-1
PELOTAS BASIN
New Frontier Block
• Block BM-P-1
Ø Total area: 11,042 km².
Ø Water depth: 50 to 1,900 m.
Ø Wells drilled: 1 (T.D: -2365 m (Imbé Fm),
reservoirs not present.
Ø Principal Plays: Miocene to Pliocene
sandstones (“Cone” area) and Eocene to
Oligocene turbiditic sandstones (Imbé Fm).
PELOTAS BASIN
New Frontier Block
BLOCK
BM-P-1
AREA
(Km 2)
WATER
DEPTH
(m)
11042
50 - 1900
SEISMIC (Km)
2D
3D
EXPL.
WELLS
5540
-
1
PELOTAS BASIN
Seismic Section – New Frontier
PELOTAS BASIN
Minimum Exploration Program
BLOCKS
EXPL.
PERIODS
(Years)
BM-P-1
3+3+3
1st PER.
2nd PER.
2D SEIS.
WELLS
(km)
5000
2
3rd PER.
WELLS
2
MINIM.
DEPTH
GUARANT.
1st PERIOD
(US$MM)
TECH. QUAL.
(Operators)
Imbé Fm
5.0
A