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ANALISIS CITRA SATELIT LANDSAT 8 DAN DEMNAS UNTUK IDENTIFIKASI PROSPEK PANAS BUMI DI KABUPATEN ACEH TENGAH, PROVINSI ACEH: LANDSAT 8 AND DEMNAS IMAGES ANALYSES TO IDENTIFY GEOTHERMAL PROSPECT IN CENTRAL ACEH REGENCY, ACEH PROVINCE Husin Setia Nugraha; Lano Adhitya Permana; Sukaesih
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.322

Combined analyses of Landsat satellite image and Digital Elevation Model Nasional (DEMNAS) are used to identify geothermal prospect areas. The analyses are applied in Aceh Tengah Regency because the information of springs exists in the regional geological map of Takengon. Two methods are applied to DEMNAS, namely the FFD method and circular features visual interpretation. Land Surface Temperature (LST) and Direct Principal Component Analysis (DPCA) methods are employed on Landsat 8 image. The appearance of circular features, anomalies of LST, and the existence of high-temperature mineral indicators are used to predict heat source indication. In addition, the FFD method is employed to indicate high permeability zones. The research shows that heat source indication is predicted at Mt. Telege Volcanic Complex within the District of Atu Lintang. The heat source is indicated by circular features appearance and LST anomalies within the area. Furthermore, the FFD method reveals an outflow zone near the hot spring of the northern part of Mt. Telege. In addition, the implementation of the DPCA method could not clearly separate between advanced argillic dan propylitic zones from their mineral indication values. It is due to mixing values among several mineral indicator values within the same pixel. In general, the application of the remote sensing method in Aceh Tengah Regency could help to indicate an early possibility of geothermal system exist within the area.

A NEW FRAMEWORK FOR CLASSIFICATION AND QUANTIFICATION OF GEOTHERMAL DIRECT USE RESOURCES AND RESERVES IN INDONESIA: KERANGKA KERJA BARU UNTUK KLASIFIKASI DAN KUANTIFIKASI SUMBER DAYA DAN CADANGAN PEMANFAATAN LANGSUNG PANAS BUMI DI INDONESIA Husin Setia Nugraha; Husin; Rina Wahyuningsih; Dudi Hermawan; Dikdik Risdianto
Buletin Sumber Daya Geologi Vol 20 No 2 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i2.447

Geothermal direct use (GDU) in Indonesia holds significant potential for supporting energy security and local economic development, yet its growth has been hindered by the absence of technical standards for potential assessment. In contrast to the well-established indirect use for electricity generation, officially recorded GDU potential remains minimal. This study aims to establish and apply a standardized framework for the classification and quantification of GDU potential and utilization in Indonesia. The developed methodology introduces a potential classification system based on two primary criteria: the quality of fluid data/information and the results of a reserve feasibility study. The potential is categorized into two main classes: Resources (Indicated, Measured) and Reserves (Probable, Proven). Quantification formulas for potential (in MWt) and utilization (installed capacity, capacity factor, annual utilization, and capacity-to-reserve ratio) are also formulated. The initial implementation of this methodology reveals that Indonesia possesses a GDU potential of at least 230 MWt from 201 inventoried prospects, which constitutes approximately 56% of all identified prospects. Of this amount, approximately 8.1 MWt has been successfully classified as Proven Reserves. This standardized framework is expected to serve as a credible national reference for resource inventory, development planning, and attracting investment in the geothermal direct use sector.

PENGARUH NILAI CADANGAN PANAS BUMI TERHADAP KELAYAKAN PROYEK PENGEBORAN SUMUR EKSPLORASI OLEH PEMERINTAH BERDASARKAN PERBANDINGAN BIAYA DAN PENDAPATAN NEGARA: STUDI KASUS PROYEK NAGE, KABUPATEN NGADA, PROVINSI NUSA TENGGARA TIMUR: GEOTHERMAL RESOURCES EFFECTS ON PROJECT FEASIBILITY OF EXPLORATION WELL DRILLING BY THE GOVERNMENT BASED ON STATE COST AND REVENUE COMPARISON: A STUDY CASE OF NAGE PROJECT, NGADA REGENCY, EAST NUSA TENGGARA PROVINCE Evi Octavia; Sinulingga, Iman K; Husin Setia Nugraha; Fitri Purnamasari Liveta
Buletin Sumber Daya Geologi Vol 18 No 2 (2023): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v18i2.361

The three main problems in Indonesia's geothermal development include selling price issues, working area tenders, and high upstream risks. These three will lead to one condition: geothermal projects cannot reach their economic level. The Government of Indonesia (GoI) has initiated the Government Drilling Program to reduce high upstream risks. In addition to the main objective of reducing geothermal upstream risk, this program can indirectly generate state revenue. It is necessary to evaluate the program not only from a technical perspective but also from a financial point of view. Stakeholders could consider the evaluation results when making decisions about the continuity of this program. This financial evaluation will assess whether the costs incurred as an investment generate the desired rate of return. In this case, it compares the costs incurred by the GoI from the state budget (APBN) and the revenues obtained by the GoI from tax and non-tax. The Indonesiaost ratio (BCR) value is a parameter indicator of its assessment. The study results show that the BCR value of the government's cash flow from the Nage Project is 2.1. This value indicates that every rupiah of costs incurred by the government in the project will generate more than twice as much state revenue. Using the rate of return parameter, namely the Internal rate of Return (IRR), this project produces a value almost double the rate of return determined if the project uses the state budget. In addition, the Nage Project's valuation based on the Net Present Value (NPV) shows a positive value (NPV> 0). Based on those three indicators, the Government Drilling Program, especially the Nage Project, is feasible to continue. However, when viewed from the developer's cash flow perspective, the Nage Project of 30 MWe is still not attractive to private developers in Indonesia because the value of the project feasibility indicator is negative or –the rate of return is still below the desired value (IRR < MARR - Minimum Attractive Rate of Return ). The project is still feasible to be continued by developers from state-owned enterprises (SOE), which usually have lower MARR values. In addition, SOE has privileges in loan and depreciation parameters compared to private developers.

REKOMENDASI AREA LOKASI TAPAK SUMUR EKSPLORASI PANAS BUMI MENGGUNAKAN PEMODELAN SISTEM INFORMASI GEOGRAFIS DI DAERAH PROSPEK CISOLOK-CISUKARAME, SUKABUMI, JAWA BARAT: RECCOMENDATION FOR GEOTHERMAL EXPLORATION WELLPAD AREA USING GEOGRAPHIC INFORMATION SYSTEM MODELING IN CISOLOK-CISUKARAME PROSPECT, SUKABUMI, WEST JAVA Husin Setia Nugraha; Dadan Wildan; Rina Wahyuningsih; Reynold Tampubolon
Buletin Sumber Daya Geologi Vol 18 No 3 (2023): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v18i3.420

The use of Geographic Information System (GIS) modelling in developing geothermal resources has been widely carried out, from the initial survey and exploration to exploitation or production stages. This GIS modelling aims to delineate specific locations that are considered to have geothermal resources or are suitable for geothermal field production facilities. This study aims to obtain a map of the recommended wellpad area for the optimal geothermal exploration well drilling location by considering technical and non-technical parameters. This research was conducted in the Cisolok-Cisukarame geothermal prospect area in Sukabumi Regency, West Java Province. The map is produced by integrating eight parameters that will affect the amount of drilling costs: prospect area, slope, reservoir crest depth area, geological structure, water source, access road, settlement area, surface manifestation area, and cultural heritage area. In the early stages, buffer areas and classifications were made for these parameters with a specific range of values based on several considerations. Furthermore, spatial data integration is carried out using vector overlaying boolean operations. The result is a map of the wellpad recommendation area for geothermal exploration wells in the Cisolok-Cisukarame area, with an area of approximately 6.31 km2 (19.62% of the P90 prospect area). Using a 120-meter fishnet produces eight large cluster areas and five small cluster areas, which are suitable for wellpad of standard hole. Meanwhile, the 50-meter fishnet produces the same number of clusters and five other smaller clusters. The results of this study can be used as recommendations for areas to be used as well as footprint locations and planning for further field survey activities such as geotechnical and infrastructure surveys.

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