1. PETROLEUM EXPLORATION IN PORTUGAL
Direcção Geral de Energia e Geologia
Divisão para a Pesquisa e Exploração de Petróleo
PETROLEUM EXPLORATION IN PORTUGAL

2. Summary
Global Overview
Exploration Activity
Petroleum Systems

3. Global Overview DGEG – DPEP The Portuguese Meso-Cenozoic basins
DPEP is the Division, within DGEG, responsible for all matters regarding petroleum exploration and production in Portugal.
The Portuguese
Meso-Cenozoic basins
From N to S:
Porto basin: ca km2
Galicia basin*: over km2
Lusitanian basin: ca km2
Peniche basin: over km2
Alentejo basin: over km2
Sagres basin: over km2
Algarve basin: ca km2
Cadiz basin*: over km2
* within Portuguese waters

4. Exploration Activity Currently Operating Companies
Operators of Previous Concessions:
Currently Operating Companies
CPP
Sceptre
Marinex
Shell
Salén
Sun
Pecten
Taurus
Esso
Neste
Mohave
Challenger
C. Dodge
Chevron
Union Texas
Texaco
Eurafrep
Petrogal
MOHAVE OIL & GAS
5 concessions in the Onshore and Shallow Offshore of the Lusitanian basin
PETROBRAS/GALP/PARTEX
4 concessions in the Deep Offshore of the Peniche basin
PETROBRAS/GALP *
3 concessions in the Deep Offshore of the Alentejo basin
REPSOL/RWE
2 adjudicated areas in the Deep Offshore of the Algarve basin
* Previously held by HARDMAN/GALP/PARTEX

5. The Portuguese basins are still underexplored
Exploration Activity
Wells Drilled
Seismic Acquisition
72,600 km of 2D seismic acquired from to 2008:
Onshore: 5,855 km
Shallow Offshore: 31,823 km
Deep Offshore: 34,922
3D seismic acquisition in :
Onshore: 247 km2
Shallow Offshore: 1000 km2
Deep Offshore: 3096 km2
67 exploration wells out of a total of 147 drilled wells:
Porto basin: 5 wells
Lusitanian basin: 58 wells
Algarve basin: 4 wells
The Portuguese basins are still underexplored

6. Wells with most significant Shows

7. PETROLEUM SYSTEMS

8. Source Rocks Mesozoic Source Rocks Paleozoic Source Rocks
Kimmeridgian: shales in the lower part of this formation represent source rock in some wells; richest in organic matter is the Cabrito Member
Oxfordian: limestones with fair to good petroleum potential (2 to 4 kg HC/ton rock), thicknesses ranging from 20 to 110 m and fair TOC content (up to 3%)
Mesozoic Source Rocks
Middle to Lower Jurassic: carbonate shales with TOC fair to rich (2.5 to 10%), initial petroleum potential fair to very rich (10 to 45 kg HC/ton rock), high thickness (140 to 190 m) and maturity ranging from 0.7% to 2% Ro eq
Sinemurian: shale beds with fair to good petroleum potential (1.1 to 60 kg HC/ton rock), small thickness (5 to 25 m), maturity from 0.7% to 2% Ro eq. and poor to good TOC (up to 3.6%)
Sinemurian: shale beds with fair to good petroleum potential (1.1 to 60 kg HC/ton rock), small thickness (5 to 25 m), maturity from 0.7% to 2% Ro eq. and poor to good TOC (up to 3,6%)
Hettangian: dark grey to black shales with fair to good TOC (up to 3.2%), locally fair to good S2 (19 kg HC/ton rock).
Net thicknesses variable from 0 to 120 m
Paleozoic Source Rocks
Marine Carboniferous shales with Ro eq. 3.5%
Visean age shales with Ro eq. 1.7%
Silurian black shales with Ro eq. between 1.75% and 3.5%

9. Reservoirs
Lower Cretaceous: loosely consolidated sandstones to unconsolidated sands represent one of the best potential reservoirs. Its continuous thickness and geographic distribution also enhances this unit as a good reservoir
Kimmeridgian: good sandstone reservoirs have been reported in the Torres Vedras, Arruda dos Vinhos & Barreiro areas
Upper Oxfordian: reefal, vugular and fractured reservoirs exist and oil filled fractures are common
Middle Jurassic: subaerial exposure and karstification may have enhanced significantly reservoir quality. Reefal and high-energy facies may have reservoir quality
Sinemurian: limestones and dolomitic limestones with porosities of less than 5%, but vacuolar and fractured sections exist within the formation
Triassic: porosity is variable, in general up to 20%. It may be considered good reservoir rock for the paleozoic potential source-rocks

10. Seals
Tertiary: marls and clays mainly developed in deep offshore basins
Cenomanian: argillaceous limestones
Jurassic: argillaceous limestones, marls and clays with variable thicknesses, interbedded within carbonates and terrestrial sediments
Hettangian: Evaporites (mainly salt) and marls

11. Traps Structural trap Stratigraphic Trap
Late Inversion Tertiary / Cret reservoirs
Late Inversion structure
Tertiary / Cret reservoirs
Stratigraphic Trap
Miocene channel fill (Mauritania analogue)
Miocene turbidites
Miocene turbidite basin floor fan

12. Basin Analogs Canada and Iberia Atlantic conjugated margins
Cadiz and Algarve basins
This proven Tortonian-Messinian sedimentary model has been extrapolated into the Algarve basin in Portuguese waters
Poseidón fields, offshore Spanish Gulf of Cádiz, produced biogenic gas from Messinian turbidite sands.
Tertiary channel analogs
Basin locations prior to main
Atlantic rifting phase
Mauritania and Iberia Atlantic margins
Similar Geologic settings until break-up in early Cretaceous
Portugal
Mauritania

13. PETROLEUM EXPLORATION IN PORTUGAL
Thank You 谢谢
Divisão para a Pesquisa e Exploração de Petróleo