some projects developed by the petroleum geology group of

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!