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GEOTHERMAL TOUR TO

THE INDONESIAN ARCHIPELAGO

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Sumatra

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SIBAYAK(North Sumatra)

Total resource area 4.5 km2

Estimated total potential 40 MW

Present power production 2 MWWater-dominated

Reservoir temperature 200 280 oC

15 % vol H2S

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The geologic map of Sibayak geothermal field

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Sibayak MT resistivity map

Predicted prospect area

Proven prospect area (2.5 km2)

Outflow

Clusters of wells

Additional MT stations

Mountain / hillResistivity contour in Ohm-m

LEGEND

Mt. Pintau

Mt. Pratektekan

Mt. Singkut

Mt. Sibayak

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Subsurface model of Sibayak

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ULUBELU (Lampung)

Total prospect area 25 km2

Estimated total potential 100 MW

Two-phase system

Reservoir temperature 220 - 260o

CGas content 0.01 % wt

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Tectonogram of

South Sumatra

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Aerial photograh & model

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Ulubelu Subsurface profile

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UBL-01 UBL-03

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Speculated thermal evolution of Ulubelu

geothermal system

sme

ill

chl - epi

epi - amphi

woll

wai preh

MEASUREDTEM

PoC

STAGES

MINERALS

TEMPERATUREoC

OLD YOUNG = PRESENT

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Java

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Geothermal distribution

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AWIBENGKOK / SALAK(Bogor, West Java)

Total proven resource 1740 Ha

Present power production 330 MWWater-dominated (17 31% steam)

Reservoir temperature 221 312 oC

1% wt NCG

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KAMOJANG(Garut, West Java)

Total proven resource 14 km2

Estimated total potential 300 MW

Present power production 140 MWVapor dominated (25 % water)

Reservoir temperature 230 245 oC

< 1 % wt NCG

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The geologic map of Kamojang

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Distribution of hydrothermal minerals & downhole

temperature profile of Well KMJ-11

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Distribution of hydrothermal minerals & downhole

temperature profile of Well CHR-1

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Fluid inclusion studies a Kamojang

Well KMJ-12Well CHR-1

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Model Kamojang

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DIENG(Wonosobo & Banjar Negara, Central Java)

Three prospect areas: Sileri, Sikidang-Merdada, Pakuwaja

Estimated total potential 355 MW

Present power production 30 MWLiquid-dominated system

Reservoir temperature up to 320 oC

0.5

1.6 % wt NCG

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Structural map of Dieng

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Kawah sikidang thermal manifestation

Telaga Warna

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Well DNG-28

Power plant 30 MW

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Surveyed geothermal prospects:

1. Buyan Beratan (Bedugul)

2. Danau Batur

Estimated total potential = 350 MWNo scientific publication

Any further development must match

with local culture & must not disturb theritual practices

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Danau Beratan

Sacred Pura Ulun Danu, with

sacred mountain, lake & warm

springs

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Danau Batur

The sacred Mt. Batur

& Mt. Abang

with sacred Batur Lake

Fumaroles with sulfur

deposit at Mt. Batur

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Regional tectonic setting &

the location of geothermal prospects at Nusa Tenggara

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ULUMBU(Flores, East Nusa Tenggara)

Total proven resource area ~ 10 km2

Installed capacity 3 MWWater-dominated

Reservoir temperature 240 oC

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Distribution of clay minerals

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ULUMBU

Subsurface

temperature &

pressure log

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ULUMBU Subsurface fluid composition predicted

from mineralogy

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LAHENDONG(Minahasa, North Sulawesi)

Two productive blocks:

a) Lengkoan block

b) Lahendong - Linau

Estimated total potential 175 MWPresent power production 20 MW

(from Lengkoan block)

Water-dominated

Reservoir temperature 250 340 oC

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Field outline

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Geologic map of Lahendong

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Subsurface

resistivity model

Subsurface gravity

model

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CHANCES FOR GEOTHERMAL

RESEARCH IN INDONESIA

Promotion surveys, e.g :

* Ungaran Telomoyo Merapi (Central Java)

* Ijen, Arjuna - Welirang (East Java)

.etc

Field development, e.g :

* Subsurface permeability mapping

* Integrated subsurface modeling

Production enhancement, e.g : scaling & acid fluid

abatementMonitoring (environment & reservoir behavior) inproducing fields

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Ungaran Telomoyo

Merbabu Merapi

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Oengaran

Telomoyo

Merbaboe

Merapi

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Ijen geothermal prospect,

East Java

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Thank you, and have acup of nice coffee