EXPLORATION STRATEGY AND RESULT - Institut …geothermal.itb.ac.id/workshop2017/sites/default/files/Plenary1_Eben... · Geothermal Tantangan/Ppt EXPLORATION STRATEGY AND RESULT GEOTHERMAL

c/HP/YS/CDM-Peluang-

Tantangan/PptGeothermal

EXPLORATION STRATEGY

AND RESULT

GEOTHERMAL ENERGY

DIREKTORAT HULU

Bandung, 22nd March 2017

Eben Ezer Siahaan

Exploration & Exploitation Department



• Exploration Scope

• Prospect Technical Evaluation

• Scope and Survey Target in Prospect Evaluation

• Success ratio of Exploration Drilling

• Some Examples of The GGG Data Evaluation

• Working Area and Operation in PT. PGE

• Conclusion

Outline



A. PRODUCTION AREA 1. KAMOJANG (1,2,3,4,5): 230MW (West

Java)

2. LAHENDONG TOMPASO (1,2,3,4,5,6):

120 MW (North Sulawesi)

3. SIBAYAK 10MW (North Sumatra)

4. ULUBELU (1,2,3,4): 220MW (Lampung)

C. EXPLORATION AREA 1. BUKIT DAUN (Bengkulu)

2. MARGABAYUR (South Sumatra)

3. SEULAWAH (Aceh)

4. MASIGIT GUNTUR (West Java)

5. SEMURUP (Jambi)

6. LAWU (Central Java)

D. NEW WORKING AREA

Cooperation with Unit Business Up Stream Pertamina

Working Area and Operation in PT. PGE

B. PROJECT1. LAHENDONG UNIT: 7 & 8 etc…

2. LUMUT BALAI: 55MW (South Sumatra)

3. KERINCI: 55MW (Jambi)

4. HULULAIS:2X55MW (Bengkulu)

5. ULUBELU: Unit-4: 55MW (Lampung)

6. KARAHA BODAS: 30MW (West Java)

GEOTHERMAL ENERGY

115115

145

145

145

110

110

115115

170

285

285

285

200 235

235

235

235

235

255255

275

275

315

315

2267

430

2025

55

165

80

340

50

220

12

170

2024

1882

140

55

11040

340

50

2022

1377

110

255

50

220

12

220

12

170

2023

1632

5555

110

255

50

220

12

170

170

2021

1112

55

140

30

220

12

170

2020

1037

5560

140

30

220

12

150

2019

922

55

11030

220

12

150

2018

792

5530

220

12130

2017

677

3055

220

12125

2016

597

3055

165

12100

2015

437

11012

80

2014

402

11012

80

KMJ 5 (35 MW)

UBL 3 (55MW)LHD 5 (20 MW)KRH 1 (30 MW)LMB 1 (55 MW)

UBL 4 (55MW)

LHD 6 (20 MW)

LHD sc (5 MW)

HLS 1 (55MW)

LMB 2 (55 MW)

LHD sc (5 MW)

SPN 1 (55 MW)HLS 2 (55 MW)LHD 7 (20 MW)

KMJ ext A1 (20 MW)LMB sc (5 MW)

HLS ext A1 (30 MW)SPN sc (5 MW)SLA 1 (55 MW)

KMJ ext B1 (20 MW)LMB 3 (55 MW)KRH 2 (20 MW)HLS 3 (55 MW)

HLS ext A2 (30 MW)HLS ext B1 (10 MW)

Binary/DF HLS (20 MW)SLA 2 (55 MW)

Projection of Installed Capacity of PGE 2015-2025

1 MW

19.015

BOEPD

47,30BOEPD

20.670

BOEPD

28.238

BOEPD

43.611

BOEPD32.02

2BOEP

D

37.462

BOEPD

89.019

BOEPD

77.194

BOEPD

65.132

BOEPD

52.598

BOEPD

107.229BOEPD

49.050BOEP

D

LMB 4 (55 MW)LMB ext A1 (30

MW)LMB ext A2 (30

MW)SPN ext A1 (30 MW)

GDP 1 (55 MW)New WKP (55 MW)

KMJ ext A2 (20MW)KMJ ext B2 (20MW)

HLS 4 (55 MW)HLS ext A3 (30

MW)KTB1&2 (40 MW)

New WKP (85 MW)

KTB 3&4 (40 MW)SLA 3 (55 MW)

New WKP (290 MW)

LHD 8 (20 MW)SPN 2 (55 MW)

New WKP

Gede Pangrango

Seulawah

Kotamobagu

Kerinci (Sungaipenuh)

Hululais & Tambang Sawah

Karaha

Lumutbalai & Marga Bayur

Ulubelu & Way Panas

Sibayak & Sinabung

Lahendong & Tompaso

Kamojang & Ciharus

GEOTHERMAL ENERGY5

The Competitive Advantage of PGE

Exploration Team

- Most of the surveys run by PGE’s GGG Team

in order to get good data acquisition

- Modelling sometimes we ask other experts as

a second opinion

- Water and gas analysis is in house analysis

with cross check data in other labs.

- All Interpretations, exploration strategy and

development wells prepared by the GGG team

of PGE



Exploration Scope

Geology

Geochemistry

Geophysics

Surveys Drilling

Exploration wells: 3-5 clusters??

- Strategy and design

- Wells to drill depend on the area

- Water supply

Challenge

- Prospect location: high/rugged terrain, accessibility

- Land status

- Surface thermal signature ex. Ubl

- High Risk drilling: HD1945 m, deep drilling 3200m depth..

- Social problem: approach to society and local government

- Economic of scale : how big to develop resources & price

- Electricity demand



Security of Steam Supply

Infrastructure

Road, WPS, Wellpad

Time from Green Field to Drilling Exploration (Bukit Daun model d fastest)

Exploration

Survey Geology,

Geochemistry,

Geophysics

1 thn

Exploration

DrillingExploration wells: 2 wells

Target probable zone-proven steam

(50% success ratio)

Development

Drilling Reservoir Model

Target 60%-80% drilling success

9 + 5 development/injection wells

For 55MW

GPP

construction

1-2 thn

2-3 thn

2 thn

Accessibility

30 thn

Equity: 100%

Debt : 0%

Equity: 30%

Debt : 70%

6 t

hn

Time +/- Stage Activity FinanceH

igh

Lo

w

Equity: 100%

Debt : 0%

Equity: 100%

Debt : 0%

Equity: 100%

Debt : 0%

1 thn

Legal:Ukl-Upl,SIPA,IPPKH etc

RIS

K

Modified jbic



Prospect Technical Evaluation

Geology, Geophysic &

Geochemistry Study

- Lidar & aerial photo

- Geology & alteration

mapping

- (volcanostratigraphy,

- structural geology,

- age dating)

- Geochemistry surface

manifestation

(water/gas/isotope/soil) survey

- Gravity, Magnetic,

Geoelectrical,Magnetotelluric

, Micro Earthquake survey

Geothermal Geological Setting

- Volcanic,intrusion

- Caldera, Graben

- Fault system

Geothermal System

- High/medium / low

Enthalpy

- Liquid/2 phase/vapour

dominated

Regional Data

Management

Regional information

Country / Domestic &

industry environment

• Social and political situation

• Country / Domestic risk

• Geothermal legislation

• Electricity Demand

• Competitors activity

• Energy Substitution Challenges

• Land Use / Permit

Project economics

• Infrastructure

• Economic indicators

• Commercial types

• Taxes

• Pricing System

• Fiscal terms

Regional Geology

• Literature/report

• Reconnaissance survey

• Tectonic Setting &

• Volcanism

Geothermal Model

- Heat source

- Reservoir geometry & fluid

- Cap Rock

- Recharge

- Permeability (detail

structural map)

- Hydrology (upflow &

outflow)

- System risk

▪ Resource assessment

▪ Risk analysis

▪ Technical/funnel review

Geothermal Setting

Resource

Preliminary Study

Project

Prospectous

Exploration

Drilling

Geothermal Model

Tentative

Model

GGGR

Evaluation



TENTATIVE MODEL

PROPOSED

EXPL.DRILLING

SURVEY TARGET

Geological Model

- Structure permeability

target/fracture density

- Volcanic Rx.thickness

- Age

- Heat source

- Volcanic facies

Hydrology Model

- Reservoir Temp.

- Up flow/out flow

Geophysical Model

- Top reservoir

- Low resistivity zone

- Boundary,Thickness

GEOSCIENTIFIC SURVEY

Modelling GGG Prospect

-Geology:

-Geological map

-Alteration system

-Lidar structure map

-Volcanostratigraphy

-Geochemistry:

-Water, steam, isotope

-Mixing/dilution model

-Fluid type etc

-Geophysics:

-MT-TDEM,

-Micro earth quake,

-Gravity, magnetic

SCOPE AND SURVEY TARGET in PROSPECT EVALUATION

DG

“Exploration study proved by the drilling shows the capability of the GGG team”

-Hg CO2

-Gradient holes

-Petrex finger print

-Schlumberger

-SP etc..

Classified the methodology of the GGG survey which is

appropriate to the volcanic geothermal system or

geological circumstances of the prospect.?

DG



Drilling is the critical work to prove all the GGG concepts and the key to

the company growth.

Some requirements to the drilling team to make a success drilling:

- Well trajectory (vertical or directional well, kop, HD, high angle

in directional well, deep drilling) stuck pipe

- Well design (casing design) deep target, hazard

- Mud parameters/air drilling formation damage

- Cementing job avoid down flow from shallow reservoir

EXPLORATION DRILLING

WELL INTEGRITY

For long term operation

Prepare Plan A and Plan B exploratorion wells

Geothermal

KAMOJANG

- Volcanic Rock (Lava+Pyro)

-Caldera Control

- Block Faulting

- Horizontal Permeability ?!

LAHENDONG+

TOMPASO

-Volcanic Rock

(Lava+pyro)

- Caldera Control

-Faulting

SIBAYAK

-Volcanic Rock

(lava+pyro)

- Caldera Control

-Faulting

EXPLORATION WELL

Vertical Well : 0% - 28%

Deviated Well : 63% - 83%

ULUBELU

-Volcanic Rock

(lava+pyro)

- Caldera Control

- Block Faulting

KERINCI

-Volcanic Rock

(Lava+pyro)

- Caldera Control

-Faulting

LUMUTBALAI

-Volcanic Rock

(Lava+pyro)

- Caldera Control

- Block Faulting

KARAHA

-Strato volcano

-Volcanic Rock

(Lava+pyro)

-Faulting

HULULAIS

-Volcanic Rock

(Lava+pyro)

- Caldera Control

- fault

BUKIT DAUN

- Strato volcano

-Volcanic Rock

(Lava+pyro)

- Graben/fault

“Big hole completion and Diverted well”

Exploration/Development

Development

KOTAMOBAGU

-Strato volcano

-Volcanic Rock

Faulting

SUCCESS RATIO

IN VERTICAL AND DEVIATED WELLS(Data Source: 246 wells from 10 Geothermal Fields)

91

37+13

509 10

27 11 5 12

DEVELOPMENT WELL

Vertical Well : 11% - 47%

Deviated Well : 67% - 93%

Success Ratio in in each field is much success in Deviated

well in big hole completion



SOME EXAMPLES OF THE GGG DATA EVALUATION



Lineament/fractures in exploration YYY

R

R

PT

D

D

T: Tension fracture

R&R’: Riedel fracture

S: Cleavage

P: Skempton fractures



T: Tension fracture

R&R’: Riedel fracture

S: Cleavage

P: Skempton fractures

Fracture Implication at the Shear Zone



SURFACE THERMAL MANIFESTATIONS



69500010125000

10126000

10127000

10128000

10129000

10130000

10131000

10132000

10133000

10134000

10135000

No

rth

(m

)

696000 697000 698000 699000 700000 701000 702000 703000 704000 705000 706000 707000

East (m)

G.Riendengan

Bukit Kasih

(Kwh.Masam)

Tompaso

Tolok

Talikuran

Kinali

Kawangkoan

Tonsewer

Tumaratas

Taratak

Tember

Tempang

Wowok

Toraget

Sumarayar

Langowan

Paso

Pulutan

Cl water

HCO3 waterHCO3 water

SO4 water SO4-Cl water

Lake

Tondano

WATER TYPE OF THERMAL MANIFESTATIONS



Deep Non

Artesian Reservoir

T.res.:260-2800C

Cl:300-400 ppm Deep Artesian

Reservoir

T.res.:300-3400C

Cl:100-400 ppm



Penampang Magneto Telluric 2D terhadap Arah Sumur LHD-23

Good-Excellent data acquisition



Alteration Model of Lahendong Area

Showing North-South Section



Conventional : Single event determination (SED)Advanced : Joint hypocenter determination (JHD)

Aditya wgc 2015

Drilling target



Well

A B

GEOTHERMAL ENERGY22

No one exploration method can be used to define the well

locations but those scientific approaches should be matched to

the geological concept.

GGG team is the competitive advantage of the company to take the

responsibility in the drilling risk and company growth.

Conclusion



Thank You

BANGKITKAN ENERGI NEGERI



Documents

EXPLORATION STRATEGY AND RESULT - Institut …geothermal.itb.ac.id/workshop2017/sites/default/files/Plenary1_Eben... · Geothermal Tantangan/Ppt EXPLORATION STRATEGY AND RESULT GEOTHERMAL