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Brasil Round 4

Recncavo Basin

Paulo de Tarso AraripeBlock Definition Superintendency

RECNCAVO BASINLocation

RECNCAVO BASIN

Area: 10,200 km2

Origin: Related to the extensional forces that acted on

Gondwanaland during the Mesozoic. Represented in thesouthern part of the western branch of a Rift Valley systemlocated along the current Brazilian coastal region, thatpreceded the separation of the South American and Africanplates.

Limits: Separated from Tucano Basin to the N and NW by the Apor

High and to the S, from the Camamu Basin by the BarraFault. Bounded to the E by the Salvador Fault.

Generalities

RECNCAVO BASIN

History

First Productive Basin in Brazil

Exploration started: 1937 First discovery: DNPM No 163

First productive well: 1-L-3-BA (Lobato) - 1939

RECNCAVO BASIN

Exploration History

Available seismic (to Dec/2001): 2D: 11,613 km 3D: 4,085 km2

Wells (to Feb/2002): Total wells drilled: 5,626 Exploration wells: 1,000 onshore

47 offshore

Average: 1/1.8 km2

RECNCAVO BASIN

Exploration Results:

Oil and gas fields: 86 Volume in place: (Dec/2001):

Oil: 954.29 MM m3 (6.001 BB bbl)

Gas: 129.470 BB m3 (4.572 tcf)

RECNCAVO BASIN

Volumes of HC

Cumulative production (Dec/2001): Oil: 222.11 MM m3 (1.396 BB bbl) Gas: 53.845 BB m3 (1.901 tcf)

Proved reserves (Dec/2001):

Oil: 33.22 MMm3 (208.9 MM bbl) Gas: 19.967 MMm3 (705.1 bcf)

RECNCAVO BASINEvolution of the Volume of Oil in Place

Modif. from Figueiredo et al.,1989

1st Phase: (surface geology + analogue seismic + some gravimetry)

Principal Fields:

Candeias (1941)Dom Joo (1947)gua Grande (1951) + 6 fields

42% of total (1989)

RECNCAVO BASINEvolution of the Oil in Place Volume


2nd Phase:(surfacegeol.+conventional seismic-analog+ digital andgravim.).

Main fields:Taquipe (1958)Buracica (1959)Aras (1965)Miranga (1965)+ 31 other fields

50 % of total -1989

RECNCAVO BASINEvolution of the Oil in Place Volume


3/4th Phases:(highresolution seismic + 3D)

Principal fields:Riacho da Barra (1982)Faz.Blsamo (1983)Rio do Bu (1984)Faz. Alvorada (1984) + 22 other fields

8% of total (1989)

RECNCAVO BASINMain Structural Features

RECNCAVO BASINBouguer Map

RECNCAVO BASINStratigraphic Chart

ClasticsPRE-RIFT

LACU

STRE

RIFT

Clastics

ClasticsPOS-RIFT

Clastics andEvaporites

SAG

Modif. from Caixeta et al., 1993

RECNCAVO BASIN

Modif. from Penteado, 1999

Schematic Geological Section

RECNCAVO BASIN

Petroleum System

Generation: Gomo/Tau Mbs - Candeias Fm

Reservoirs: Fluvial-eolian sands of the

Sergi and gua Grande Fms and turbidites of theCandeias, Marfim and Maracangalha Fms

Seals: Overlying/intercalated shales Traps: Stratigraphic, structural or mixed Migration: Along fault planes or by direct

reservoir-source rock contact (Gomo)

RECNCAVO BASIN

Isopach map

Candeias Fm

Gomo Mb

Observation:

Total thickness includescalcilutites and turbidites

Figueiredo et al., 1989

RECNCAVO BASIN

Geochemical log

Rift Sequence: Candeias Fm Gomo Mb: TOC ave: 1- 2% (up to 10%)

Generation Potential:

16 kg (up to 60 kg)HC/ton

Hydrogen Index:

Up to 700mgHC/gTOC

Kerogen: Type I

Generation Index:Early Barremian to late Aptian

Petroleum System

RECNCAVO BASIN

Reservoir Quality

Pr-Rift Sequence - Sergi Fm: = 10 - 25 % K = 20 - 1200 mD - gua Grande Fm: = 21 - 27 % K = up to 2,000 mD Rift Sequence - Candeias Fm: = 15 - 18 % K = 30 - 200 mD - Ilhas Fm: = 18 - 24 % K = 30 - 300 mD

Petroleum System

RECNCAVO BASIN

Mello et al., 1994

Petroleum System

Event Chart

Principal System:

CANDEIAS-SERGI (!)

RECNCAVO BASIN

Composite Log and relative position between sourcerocks and reservoirs

Petroleum System

RECNCAVO BASIN

Trap model

Modif. from Braga et al., 1987

Petroleum System

RECNCAVO BASIN

Eg.: gua Grande, Buracica and D. Joo fields

Play Pre - Rift

Santos & Braga, 1989

RECNCAVO BASIN

Eg.: Candeias and Riacho da Barra fields

Play Rift - Candeias


RECNCAVO BASIN

Eg.:Taquipe, Miranga and Aras fields

Play Rift - Ilhas


RECNCAVO BASIN

Oil and Gas

Fields

Source: Petrobras

RECNCAVO BASIN

Relative distribution of oil

pr-Rift Sequence:

Sergi and gua Grande Fms : 57%

Rift Sequence:

Ilhas Fm: 27%

Candeias Fm: 16%

RECNCAVO BASIN

BT - REC - 7

BT - REC - 8

BT - REC - 9

BT - REC - 10

Blocks for Bidding

RECNCAVO BASINAvailable 2D Seismic on the blocks

Total: 3.064 kmTotal: 3.064 km

RECNCAVO BASINAvailable 3D Seismic on the blocks

Total: 10.619 kmTotal: 10.619 km

RECNCAVO BASINBT - REC - 7 - Location

Maracang., Marfim and Pojuca Fm sands

RECNCAVO BASINBT-REC-7 - Seismic

2D seismic: (inclusive2D seismic: (inclusiveof part of BT-REC-8):of part of BT-REC-8):1,871 km1,871 km

Area: 161.93 km2Area: 161.93 km2Area: 161.93 km2

CexisCexis

LamaroLamaro

CandeiasCandeias

CamaariCamaari

MapeleMapele

AratuAratu

RECNCAVO BASIN

Lamaro Lamaro FieldField

Play Example

Modif. From Petrobras, 1997

RECNCAVO BASINBT-REC-7 Wells

ExplorationExplorationwells:14wells:14

RECNCAVO BASINBT- REC - 8 - Location

Maracang.,Marfim and Pojuca Fm sands

(Valang/Barrem)

RECNCAVO BASIN

BT-REC-8 - Seismic

2D seismic: 1,871km2D seismic: 1,871km(includes part of(includes part ofBT-REC-7)BT-REC-7)3D seismic: 1,340 km3D seismic: 1,340 km

Area: 231.42 kmArea: 231.42 km

TaquipeTaquipe

MataMataS. JooS. Joo

LamaroLamaro

S. PedroS. PedroMassapMassap

RECNCAVO BASINPlay Example


Faz. Sori

Field

RECNCAVO BASIN

BT-REC-8 - Wells

ExplorationExplorationwells: 23wells: 23


Turbid. and deltaics sands(Berriasian-Barrem.) of theCand./Marac., & Pojuca Fms

RECNCAVO BASINBT-REC-9 - Seismic

2D seismic: 1,193 km2D seismic: 1,193 km((inclincl. BT-REC-10). BT-REC-10)3D seismic: 2,346 km3D seismic: 2,346 km

Area: 212.82 kmArea: 212.82 km22

SussuaranaSussuaranaRioRio Pojuca Pojuca

RiachoRiacho S. Pedro S. Pedro

FazFaz.. Gameleira Gameleira



Riacho de S. Pedro Field

RECNCAVO BASINBT-REC-9 - Wells

ExplorationExplorationwells: 20wells: 20


Sands of the Sergi, gua Grande, Candeias,Maracang. and Pojuca

Fms (pre-Rift/Rift)

RECNCAVO BASIN BT-REC-10 - Seismic

2D seismic: 1,193 km2D seismic: 1,193 km(includes BT-REC-9)(includes BT-REC-9)

3D seismic: 6,933 km3D seismic: 6,933 km

Area: 312.95 kmArea: 312.95 km22

MirangaFaz.Belm

guaguaGrandeGrande

BiribaBiriba

ApraisAprais


Modif. From Petrobras

Aprais/Lagoa do Paulo Field

RECNCAVO BASIN

Riacho da Barra Field Play Example

Modificado from Figueiredo et al.,1989

RECNCAVO BASIN

BT-REC-10 - Wells

Exploration wells:Exploration wells: 54 54

Statistical Data

Major Brazilian petroleum producingbasin over four decades

High index of recoverable oil:

21,100 m3 (132,500 bbl)/km2

RECNCAVO BASIN

RECNCAVO BASIN

Semi-Mature Stage ofExploration!

(Andrade, 1989)

BACIA DO RECNCAVO

Andrades opinions in 1988

- The Recncavo Basin is in a semi-mature stage of

exploration

- There are several possibilities for oil & gas in

specific areas of the basin

- New discoveries depends on increased quality of seismic in less drilled areas - Search for mixed, stratigraphic and nonconventional traps shall be considered

- Enhance the use of new tecnologies and new

exploratory concepts

BACIA DO RECNCAVO

Wells drilled (1988-2001): 873

Wells completed (oil and gas - 2000): 108

Total oil production (1988-2000):37.621 MM m3

Proved reserves (2000):33.350 MM m3

Reserves incorporated between 1988-2000:

15.407 MM m3

The example of Recncavo

EXPLORATION HISTORY

BACIA DO RECNCAVO

- Gulf Coast Region hasnt reached yet its full potential

- There are several untested possibilities for oil & gas

- Total of wells drilled, only in TX & LA, surpasses

820,000 (1/km2)

- New discoveries depend principally on increased

seismic activities, exploratory drilling and new

geologic concepts

Halboutys opinions in 1988

The example of TEXAS

RECNCAVO BASIN

Wells drilled (1988-2001): 140,488 Wells completed (oil and gas - 2000): 114,265 Total oil production (1988-2000): 7.141 BB bbl Proved reserves (2000): 5.273 BB bbl Reserves incorporated (2000): 335 MM bbl

Source: Railroad Comission

The example of TEXAS

EXPLORATION HISTORY

Minimum Exploration Program

100

2

2

1,0Value of Financial Guarantee (US$MM)

WORK AND INVESTMENT PROGRAM

First period (km of seismic 2D)

Second period (number of wells)

Third period (number of wells)

Exploration Period Duration (years)Obligatory

Relinquishment (%)

First period 3 50

Second period 2 25

Third period 2 25

RECNCAVO BASIN

Thank you for your attention

RECNCAVO BASIN

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