pernambuco-paraíba basin

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PERNAMBUCO-PARAÍBA
BASIN
Paulo de Tarso Araripe
Block Definition Superintendency
PERNAMBUCO-PARAÍBA BASIN
Location
Regional Location
Regional Location
Northern Boundary
Alto de Touros
Bacia Potiguar
Southern Boundary
Maragogi High
Alagoas Basin
Matos, 1999
Generalities
• Area: 39,000 km2
Onshore: 7,600 km 2
Offshore: 31,400 km 2
Origin: Early Aptian Rift (or older) originating at a
relatively later phase compared to the
Eastern and Equatorial margins, when the
continental crust in this area was the last strip
connecting the continents of Africa and
South America
Pre-Drift Reconstruction
• Aptian Scenario
Western of Africa
and
Northern/Northeastern
of Brazil
Matos, 1998
• Magnetic Map
Block
BM-PEPB-1
Regional
Context
Gravimetric Anomalies
(fonte: Karner - Sandwell)
Ascenção Fracture Zone
in Hamsi Júnior, 1998
Geologic Sections - Onshore Basin
Source: Lima Filho, 98
Structuaral
Framework of
the Basement
Stratigraphic Chart
PE/PB - ALAGOAS
Onshore Basin
Changes in the column
Pernambuco Group:
Pleistocenic Marine Terraces
Barreiras Formation
Algodoais Formation
Volcanic Suite of Ipojuca
Sto Agostinho Granite - 105-102 Ma
Riolites - 119 Ma, Basalts - 87 Ma
Estiva Formation
Cabo Formation
Aptian - P- 260 - 2953-890m
P-270 / P-280 - 1890-66m
Lima Filho, 98
Obs.: The Cabo Fm does not lie totally on basement,
but also on rhyolites of the Ipojuca Volcanic Suite
(Lima Filho, 98).
Schematic Geologic Section - Offshore
Exploration History
• Gravimetric cover
• Magnetometric cover
• Detailed Surface Mapping
• Seismic (up to Feb/2002): 10,078 km
• Spec Seismic: 960 km
• Wells (onshore): 3 (the deepest to 3,000m,
others to 1,100m and 400m)
Available Regional Seismic
Total:1,407 km
Available 2D seismic Lines
Total:
1,200 km
Block BM-PB-1
Area: 3,554 km2
Batim: 25-2,000m
Objectives:
Cabo Fm Sandstones,
Turbidites Calumbi Fm
Favourable Basin Factors
• Evidence of an Aptian or older Rift according to
surface mapping
• Thick sedimentary section (Rift and Drift)
• Seismic evidence of structuring
• Adequate thermal evolution (pre, syn and postRift)
• Onshore geochemical anomalies
• Offshore geochemical anomalies (piston cores)
• Timing
Petroleum System
• Onshore and offshore geochemical anomalies
• Presence of black shales in onshore wells
• Evidence of reservoirs in onshore wells
• Possible turbidites in deepwater areas
• Possible seals in distal areas - offshore
• Evidence of inversion structures on seismic lines
- formation of traps
• Evidence of faults – possible routes for the
migration of HC
• Timing
Petroleum System
• Geochemistry study
• Onshore - surface survey
• Results: high concentrations anomalies of gaseous HC
•
Interpretation: generation processes and migration of HC,
preferentially coming from deeper portions
of the offshore basin
• Offshore - piston cores survey
•
•
Results: heavy gaseous HC anomalies (low oncentrations)
principally north and center of basin
Interpretation: active petroleum system processes
within subsurface - possible thermochemical origin
Geochemical data interpretation
4.5
4.6
4
3.
4.0
BM - PEPB-1
4.1
2.3
4.2
5
Onshore & Offshore
results
C2 + C3 + C4 +C5
contour values (ppm)
Line 250 - 374
Line 250 - 371
Line 250-368
250-368 (zoom - vert. exagg.)
Line 250-363
Line 250-364 - strike
WORK AND INVESTMENT PROGRAM
First period (km of seismic 2D)
3.000
Second period (number of wells)
2
Third period (number of wells)
2
Value of Financial Guarantee (US$MM)
3.0
Exploration Period
Duration (years)
Obligatory
Relinquishment (%)
First period
3
50
Second period
3
25
Third period
3
25
Thank you for your attention

pernambuco-paraíba basin

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Pernambuco-Paraíba Basin