reconcavo ing

Brasil Round 4

Recôncavo Basin

Paulo de Tarso AraripeBlock Definition Superintendency

RECÔNCAVO BASINLocation

RECÔNCAVO 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 Aporá

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

Generalities

RECÔNCAVO BASIN

History

• First Productive Basin in Brazil

Ø Exploration started: 1937Ø First discovery: DNPM No 163

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

RECÔNCAVO 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

RECÔNCAVO BASIN

Exploration Results:

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

Ø Oil: 954.29 MM m3 (6.001 BB bbl)

Ø Gas: 129.470 BB m3 (4.572 tcf)

RECÔNCAVO BASIN

Volumes of HC

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

• Proved reserves (Dec/2001):

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

RECÔNCAVO 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 João (1947)Água Grande (1951) + 6 fields

42% of total (1989)

RECÔNCAVO BASINEvolution of the Oil in Place Volume


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

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

• 50 % of total -1989

RECÔNCAVO BASINEvolution of the Oil in Place Volume


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

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

• 8% of total (1989)

RECÔNCAVO BASINMain Structural Features

RECÔNCAVO BASINBouguer Map

RECÔNCAVO BASINStratigraphic Chart

ClasticsPRE-RIFT

LACU

STRE

RIFT

Clastics

ClasticsPOS-RIFT

Clastics andEvaporites

SAG

Modif. from Caixeta et al., 1993

RECÔNCAVO BASIN

Modif. from Penteado, 1999

Schematic Geological Section

RECÔNCAVO BASIN

Petroleum System

• Generation: Gomo/Tauá Mbs - Candeias Fm

• Reservoirs: Fluvial-eolian sands of the

Sergi and Água 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)

RECÔNCAVO BASIN

• Isopach map

Candeias Fm

Gomo Mb

• Observation:

Total thickness includescalcilutites and turbidites

Figueiredo et al., 1989

RECÔNCAVO 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

RECÔNCAVO BASIN

• Reservoir Quality

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

Petroleum System

RECÔNCAVO BASIN

Mello et al., 1994

Petroleum System

• Event Chart

• Principal System:

CANDEIAS-SERGI (!)

RECÔNCAVO BASIN

Composite Log and relative position between sourcerocks and reservoirs

Petroleum System

RECÔNCAVO BASIN

• Trap model

Modif. from Braga et al., 1987

Petroleum System

RECÔNCAVO BASIN

Eg.: Água Grande, Buracica and D. João fields

Play Pre - Rift

Santos & Braga, 1989

RECÔNCAVO BASIN

Eg.: Candeias and Riacho da Barra fields

Play Rift - Candeias


RECÔNCAVO BASIN

Eg.:Taquipe, Miranga and Araçás fields

Play Rift - Ilhas


RECÔNCAVO BASIN

Oil and Gas

Fields

Source: Petrobras

RECÔNCAVO BASIN

Relative distribution of oil

• pré-Rift Sequence:

Sergi and Água Grande Fms : 57%

• Rift Sequence:

Ilhas Fm: 27%

Candeias Fm: 16%

RECÔNCAVO BASIN

BT - REC - 7

BT - REC - 8

BT - REC - 9

BT - REC - 10

Blocks for Bidding

RECÔNCAVO BASINAvailable 2D Seismic on the blocks

Total: 3.064 kmTotal: 3.064 km

RECÔNCAVO BASINAvailable 3D Seismic on the blocks

Total: 10.619 kmTotal: 10.619 km

RECÔNCAVO BASINBT - REC - 7 - Location

Maracang., Marfim and Pojuca Fm sands

RECÔNCAVO 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

LamarãoLamarão

CandeiasCandeias

CamaçariCamaçari

MapeleMapele

AratuAratu

RECÔNCAVO BASIN

•• Lamarão Lamarão FieldField

Play Example

Modif. From Petrobras, 1997

RECÔNCAVO BASINBT-REC-7 Wells

ExplorationExplorationwells:14wells:14

RECÔNCAVO BASINBT- REC - 8 - Location

Maracang.,Marfim and Pojuca Fm sands

(Valang/Barrem)

RECÔNCAVO 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. JoãoS. João

LamarãoLamarão

S. PedroS. PedroMassapêMassapê

RECÔNCAVO BASINPlay Example


• Faz. Sori

Field

RECÔNCAVO BASIN

BT-REC-8 - Wells

ExplorationExplorationwells: 23wells: 23


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

RECÔNCAVO 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

RECÔNCAVO BASINBT-REC-9 - Wells

ExplorationExplorationwells: 20wells: 20


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

Fms (pre-Rift/Rift)

RECÔNCAVO 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.Belém

ÁguaÁguaGrandeGrande

BiribaBiriba

ApraiúsApraiús


Modif. From Petrobras

Apraiús/Lagoa do Paulo Field

RECÔNCAVO BASIN

Riacho da Barra Field Play Example

Modificado from Figueiredo et al.,1989

RECÔNCAVO 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

RECÔNCAVO BASIN

RECÔNCAVO BASIN

Semi-Mature Stage ofExploration!

(Andrade, 1989)

BACIA DO RECÔNCAVO

Andrade’s opinions in 1988

“- The Recôncavo 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 RECÔNCAVO

• 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 Recôncavo

EXPLORATION HISTORY

BACIA DO RECÔNCAVO

“- Gulf Coast Region has’nt 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“

Halbouty’s opinions in 1988

The example of TEXAS

RECÔNCAVO 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

RECÔNCAVO BASIN

Thank you for your attention

RECÔNCAVO BASIN

reconcavo ing

Documents

productive basin

gas fields

volume of oil

tucano basin

camamu basin

md rift sequence candeias

recncavo basinpaulo

total wells