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GEOTHERMAL POTENTIAL ESTIMATION USING ITS CLASSIFICATION SYSTEM, ACCORDING TO THE NATIONAL STANDARIZATION AGENCY OF IN

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GEOTHERMAL POTENTIAL ESTIMATION USING ITS CLASSIFICATION SYSTEM, ACCORDING TO THE NATIONAL STANDARIZATION AGENCY OF IN

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    1. 4/14/2012 1 GEOTHERMAL POTENTIAL ESTIMATION USING ITS CLASSIFICATION SYSTEM, ACCORDING TO THE NATIONAL STANDARIZATION AGENCY OF INDONESIA

    2. 4/14/2012 2 CLASSIFICATION SYSTEM

    3. 4/14/2012 3 POTENTIAL GEOTHERMAL STANDARIZATION Institutional Publisher : National Standarization of Indonesia (Badan Standarisasi Nasional Indonesia) Initiator : Concerned Communities, (Geothermal Community,) Established since 1994 Title : 1. Geothermal Energy Potential Classification of Indonesia (SNI 13-5012- 1998, ICS 73.020) 2. Estimation Method for Geothermal Energy Potential of Indonesia (SNI 13-6171-1999, ICS 73.020) Purpose : - common understanding - compare resources data effectively - definitive - broadly applicable Output - Classification System and Energy Potential Estimation

    4. 4/14/2012 4 INDONESIA ARCHIPELAGOS 95 - 141º East Longitudes, 6º North - 11º South latitudes. More than 17,000 islands, more than 5,000 Km span Mediterranean and Pacific Volcanic Belts – Ring of Fires Geothermal Distribution Map

    5. 4/14/2012 5 US-DOE GEOTHERMAL DEVELOPMENT PHASES US-Department of Energy (1995) describes a geothermal development phases into several activities as describe as follows: (1) Reconnaissance: do geological, geochemical, 20 sites (2) Discovery: drill 1 to 4 deep holes at best site (5 sites) to find hot fluid. Do initial flow tests. (3) Confirmation: drill more deep wells to prove field can support the application More flow tests. (4) Design: design and cost plant and field to allow cost are higher for the first plant at a new site. (5a) Production drilling: drill production and injection wells. (5b) Plant construction: build the plant. (6) Operation: operate and maintain system. Drill replacement wells as needed.

    6. 4/14/2012 6 PRACTICAL PROCEDURE INDONESIA DEVELOPMENT PHASES (1) Reconnaissance / preliminary exploration: desk study and do a geological mapping and geochemical preliminary investigation. Resulting reconnaissance geological map, distribution of geothermal manifestations, surface and subsurface temperatures and other parameters. (2) Advance reconnaissance / advance preliminary exploration; do geological, satellite imagery geochemical and geophysical surveys and. Resulting geological map, chemical and fluid anomaly and geophysical and hydrogeological maps. (3) Detail exploration; integrated geoscientific survey, geological map (1 : 5,000), geochemical surveys, and geophysical survey and thermal gradient wells. These gradient wells provide the first, strong and direct evidence of the location and intensity of thermal energy (4) Exploratory drilling (wildcat) ; drilled in a news geothermal prospect which has important repercussions, its allows collection of all type geologic, chemical, physical and reservoir related information. Its success or failure will strongly influence commitment funding for further works, the phases of this assessment refers to prefeasibility study stage, (5) Delineating drillings ; drilled in a triangular arrangement to access three dimensional data interpretation for the confirmation purposes including carefully tested to determine their suitability as production or injection wells. Its accumulated data could access the feasibility analysis, this feasibility study phase is the milestone for the construction funding, as the financial confirmation depending on this analysis. (6) Development drillings ; drilled a number of production wells to produce the quantity of energy needed to full fill power plant requirement. The economic limit consideration for production of individual well in Indonesia is 7 MW, however for several wells in geothermal fields, produces even more much bigger than 7 MW (Darajat-2/81.3 MW installed, 2001, have been 38 MW from single well, Wayang Windu 1/110 MW installed 2001, produces 40 MW from single well, Wayang Windu 2/110 MW under construction produces 40 MW from single well. (7) Utilization of geothermal resources: 30 years in operation, drill make up wells as needed

    7. 4/14/2012 7

    8. 4/14/2012 8 A speculative resource, undiscovered geothermal prospect area which identified from preliminary exploration, is estimated its resources potential using the following formula; Hel = A x Qel where: Hel = energy potential (MWe) A = prospect area (km²) Qel = power density (MWe/(Km²) While for a hypotetive resources, a probable, a possible and a proven reserve potentials using the following formula ; He = Ah [(1 – ?) ?r x Cr x T + ? (?L UL SL + ?V UV SV)] where: He = thermal energy (kJ) A = prospect area (m²) h = thickness of reservoir (m) T = temperature of reservoir (ºC) SL = saturation of liquid (fraction) SL = saturation of vapor (fraction) UL = energy of liquid (kJ/kg) Uv = energy of vapor (kJ/kg) ? = porosity of rock (fraction) Cr = capacity of rock thermal (kJ/kg²C) ?r = density of rock (kg/m³) ?L = density of liquid (kJ/m³) ?v = density of vapor (kJ/m³)

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    12. 4/14/2012 12 UNDER CONSTRUCTION PROJECT

    13. 4/14/2012 13 CONCLUSION Potential Estimation Is Dynamic Process

    14. 4/14/2012 14

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