Some Projects Developed by
the Petroleum Geology Group
of UFRGS Geoscience
Institute
Prof. Luiz Fernando De RosIGEO-UFRGS
Petroleum Geology at IGEO - UFRGS
EXPLORATION& RESERVOIR
Stratigraphy
Diagenesis
Provenance
BiostratigraphyPaleoecology
Geotectonics
IsotopicGeology
OrganicGeochemistryPetrography
GEOSCIENCES INSTITUTE
87 lecturers; ~ 85% with PhDs
Geology Course: since 1957; cooperation with Stratigraphy and Paleontology areas of Petrobras; ~ 1200 geologists graduated
Graduate Course in Geosciences: since 1968; CAPES top evaluation (7); 4 Concentration Areas : Stratigraphy, Paleontology, Marine Geology, Geochemistry; 45 supervisers; 827 MSc and 364 PhD
Labs: Isotopes (mass spec, ICP-MS, etc.); SEM; XRD; Organic Geochem./Petrol.; XRD, Palynology; Microprobe
Projects in many Brazilian basins. + basins in Argentina, Uruguay, Peru, Colombia, Namibia, Mozambique, etc
Petroleum Geosciences Research Areas
BG GROUP
Integrated Stratigraphic-Sedimentologic-Petrologic Study of the Clastic Rift Sections of Santos and Campos Basins, Eastern Brazil
Objectives
• Integrated interpretation of the rift section of the CamposBasin, aiming at:
- Stratigraphic and tectonic evolution;
- Depositional controls, sedimentological processes;
- Depositional and diagenetic constituents;
- Diagenetic controls and history;
- Depositional integrated model and evolutionary history;
- Role of the depositional evolution on the petroleumsystem.
• Extension of the model to the Santos Basin
Wells in blue = no
cores
Primary composition
Predominantly intrabasinal: stevensite ooids, bivalve bioclasts,
RJS514 4165,75 RJS485/ 2822,60
Seismic Stratigraphy: re-sedimentedbioclastic carbonate deposits
Bioclastic rudstone, without mixing = porous(1RJS-0116-RJ 3834,10 m)
Bioclastic rudstone, with mixedstevensite/clastics = cemented by calcite(1RJS-0116-RJ 3702,4 m)
4
1
1
2
2
3
33 1
2
Seismic facies - Application to line 1230
Evolution Model
TIME 6:Continuing deposition in the half-graben during the LowTectonic Activity System Tract. Shallow-wateraccumulation of bivalve banks and stevensite ooids in the flexural margin. Erosion of older units in the flexuralmargin. Continuous erosion of the uplifted footwall alongthe border fault, and deposition of the border-faultdeposits. Re-sedimented deposits in the troughs.
Luiz Fernando De Ros
Marcus Vinicius Dorneles Remus
Maria Lidia Vignol-Lelarge
Universidade Federal do Rio Grande do Sul
Sandstone Provenance
BM-J-3 BLOCK
Jequitinhonha Basin
Stratigraphic sequences
SEQUENCE I (Aptian)
SEQUENCE II (Albian-Cenomanian)
SEQUENCE III (Coniacian-Campanian)
SEQUENCE IV (Maastrich.-Campanian)
SEQUENCE V (Paleocene)
SEQUENCE VI (Eocene)
SEQUENCE VII (Oligocene-Recent)
Major source terrains of
Jequitinhonha Basin
Quantitative modal petrography
(Gazzi-Dickinson Method)
Heavy mineral assemblages
Kyanite, andalusite, sillimanite, staurolite, chloritoid, garnets
Hornblende, actinolite, epidote, anisotropic garnets
Zircon, tourmaline, xenotime, monazite
Geochemical garnet composition
P = Mg garnetAlS = Fe+Mn garnetsGAU = Ca+Fe,Ti+Cr garnetsAl = Fe garnetS = Mn garnetPGAU = Mg+Ca+Fe,Ti+Cr garnets
high grade metamorphic rocksmiddle/lower grade metamorphic rocksmafic amphibolites and gnaissesmetacarbonatespegmatites, aplites and granites
SHRIMP zircon dating
basement and sandstone samples
Aptian sedimentary supply
56
Aptian
Albian-Cenomanian
Upper Cretaceous
Paleocene-Eocene
Oligocene-Recent
POLVO Project
INTEGRATED ANALYSIS OF THE UPPER CRETACEOUS
SANDSTONES OF THE POLVO FIELD AREA, CAMPOS BASIN
Characteristics of the Polvo Project
Main Goals of the PolvoProject:
Increase the knowledge of Maersk about the Upper Cretaceous sandstones of the Polvo and surrounding
areas (Peregrino)
Based on a Integrated Study:•Petrography•Sedimentology•Stratigraphy•Seismic•Biostratigraphy
Petrographic analysis
Main reservoirs in the Peregrino Field area:
Dominantly coarse to medium-grained, locally conglomeratic,
porous, friable sandstones, rich in feldspar grains and in plutonic
rock fragments
ENC1RJS 2340.28 ENC3RJS 2273.72
Petrographic analysis
Sandstones of the upper, unconfined interval:
Dominantly fine-grained, rich in mud intraclasts, and in glauconite
peloids
Bioturbation common
ENC2RJS 2288,15ENC1RJS 2315,325
Sedimentology – Facies Models
CH – Dominance of Gl and Gm, subordinated occurence of Sm, Smg and SlPL – Dominance of Sm and ShIL – Dominance of Sr, subordinatedoccurence of Sh and SmDL – expected Fm with subordinated Sr.
Stratigraphy
Seismic facies indicate different arrangement of depositional sub-systems, or architectural elements, along the depositional system.
Mud dominated depositsSand dominated depositsVolcanics? Intrusives?
Integrated Model
Upper Cretaceous turbidite complexes
of Campos Basin are extremely
immature, although deposited within
the Upper Cretaceous 2nd order
transgressive system (Fetter et al.
2009).
Serra do Mar uplift events were the
triggers of high-supply discharges
during a transgressive interval, creating
immature and retrograding turbidite
complexes.
Integrated Stratigraphic-Petrologic
Characterization of Sergi Formation Reservoirs
OBJECTIVES
• Integrated study of stratigraphic-sedimentologic-petrologic aspects of the fluvial-eolian reservoirs of Sergi Formation;
• Identify the influence of depositional architecture and facies on reservoir distribution, heterogeneity and diagenetic evolution;
• Enhance the recovery of hydrocarbons from mature oilfields.
StratigraphicFramework
Three depositional sequences limited by regional unconformities:
Constituted by different facies associations:
Sequence I – fluvial - eolian -lacustrine
Sequence II – fluvial braided
Sequence III – fluvial - eolian
Stratigraphic detail – Sequence I
Stratigraphic detail – Sequence I
Permeability analysis - Sequence I
Sequence I - potential flow barriers at channels boundaries
Calcite-cemented intraclastic basal lags
Amalgamated sand bodies of braided channel belts.
Stratigraphic detail – Sequence II
Infiltrated clays influence permeability distribution
Permeability analysis - Sequence II
Pore-lining and pore-filling mechanically-infiltrated clays
Infiltrated clays
Stratigraphic control on infiltrated clays distribution
Integrated Stratigraphic-Petrologic
Characterization and Modelling of
Mixed Siliciclastic-Carbonate Systems
from Fazenda Santa Luzia and Fazenda
São Rafael Oilfields, Espírito Santo Basin
CONTEXT
OBJECTIVES
Integrated sedimentologic – stratigraphic – petrologic
characterization of the mixed siliciclastic-carbonate
systems from Fazenda Santa Luzia and Fazenda São
Rafael oilfields, Espírito Santo Basin, for the construction
of geologically coherent models of reservoirs genesis,
evolution, geometry and heterogeneity.
Siliciclastic Rocks
Carbonate Rocks
Hybrid Rocks
1D Modelling
Integrated Logs
1) Depth, cores;
2) Cores photos;
3) GR and RHOB logs;
4) Facies;
5) Lithologies;
6) Bioturbation;
7) Facies associations;
8) Thin sections;
9) Intergranular Constituents ;
10) Photomicrographs;
11) Petrofacies.
2D Modelling – Isoliths Maps
3D Modelling – Lithologic classes distribution
Depositional Model
Gravitational re-deposition of aluvial clastic, shallow-marine carbonate and hybrid sediments, reworked in a shallow ramp.
Thanks!