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Abstrak :
[ABSTRAK
Sistem panas bumi vulkanik, bertemperatur tinggi dan liquid dominated Dieng memiliki potensi sebesar 355 MWe meliputi area Sileri, Sikidang-Merdada dan Pakuwaja. Hingga saat ini telah beroperasi pembangkit listrik berkapasitas 1x60 MW disuplai oleh uap dari sumur di area Sileri.

Re-evaluasi strategi pengembangan lapangan panas bumi Dieng secara terpadu dilakukan dengan mengkaji data geologi, data geokimia manifestasi dan sumur dan data geofisika. Kajian geokimia meliputi air, gas, isotop untuk mengetahui karakteristik kimia reservoir, didukung oleh model 2D Magnetotellurik (MT) yang menggambarkan distribusi resistivitas bawah permukaan, model 2D gravitasi yang menggambarkan struktur bawah permukaan, serta didukung oleh struktur geologi, vulkanostratigrafi dan alterasi hidrothermal.

Hasil penelitian menunjukkan bahwa terdapat dua zona upflow utama di Sileri dan Sikidang. Zona asam di Sikidang ditunjukkan oleh keberadaan fluida magmatik, isotop 18O yang enrich dan mendekati zona andesitic water di sekitar sumur DNG-2 dan DNG-8. Zona aman silica scaling di area Sileri berada di sekitar sumur HCE-31 dan DNG-10.

Pengembangan lapangan Dieng selanjutnya masih mungkin dilakukan di area bagian timur laut yang ditunjukkan oleh keberadaan claycap dan heat source pada zona upflow Sileri.

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ABSTRACT
Volcanic geothermal systems, high temperature and liquid dominated Dieng has a potential of 355 MWe covers an area Sileri, Sikidang-Merdada and Pakuwaja. Until currently operates power plants with a capacity of 1x60 MW supplied by steam from wells in Sileri area.

Re-evaluation of Dieng development strategy in integrated to seek the extension of field development by assessing the geochemical data of manifestations and wells, geophysical data and geological data. Geochemical studies include water, gas and isotope to describe reservoir chemical characteristic, supported by a 2D model of Magnetotelluric (MT) which describes the distribution of subsurface resistivity, 2D model of Gravity depicting subsurface structures, and supported by geological structure, vulkanostratigrafy and hydrothermal alteration.

There are two main upflow zone in Sileri and Sikidang. Acid zone shown at magmatic fluid existence, enrich of 18O and approximate the andesitic water zone in around DNG-2 and DNG-8. Safe Zone of Silica Scaling be in around of HCE-31 and DNG-10.

Furthermore, Dieng development is possible in north-east area which show in clay cap and heat source existence in Sileri Upflow Zone.;Volcanic geothermal systems, high temperature and liquid dominated Dieng has a potential of 355 MWe covers an area Sileri, Sikidang-Merdada and Pakuwaja. Until currently operates power plants with a capacity of 1x60 MW supplied by steam from wells in Sileri area. Re-evaluation of Dieng development strategy in integrated to seek the extension of field development by assessing the geochemical data of manifestations and wells, geophysical data and geological data. Geochemical studies include water, gas and isotope to describe reservoir chemical characteristic, supported by a 2D model of Magnetotelluric (MT) which describes the distribution of subsurface resistivity, 2D model of Gravity depicting subsurface structures, and supported by geological structure, vulkanostratigrafy and hydrothermal alteration. There are two main upflow zone in Sileri and Sikidang. Acid zone shown at magmatic fluid existence, enrich of 18O and approximate the andesitic water zone in around DNG-2 and DNG-8. Safe Zone of Silica Scaling be in around of HCE-31 and DNG-10. Furthermore, Dieng development is possible in north-east area which show in clay cap and heat source existence in Sileri Upflow Zone.;Volcanic geothermal systems, high temperature and liquid dominated Dieng has a potential of 355 MWe covers an area Sileri, Sikidang-Merdada and Pakuwaja. Until currently operates power plants with a capacity of 1x60 MW supplied by steam from wells in Sileri area. Re-evaluation of Dieng development strategy in integrated to seek the extension of field development by assessing the geochemical data of manifestations and wells, geophysical data and geological data. Geochemical studies include water, gas and isotope to describe reservoir chemical characteristic, supported by a 2D model of Magnetotelluric (MT) which describes the distribution of subsurface resistivity, 2D model of Gravity depicting subsurface structures, and supported by geological structure, vulkanostratigrafy and hydrothermal alteration. There are two main upflow zone in Sileri and Sikidang. Acid zone shown at magmatic fluid existence, enrich of 18O and approximate the andesitic water zone in around DNG-2 and DNG-8. Safe Zone of Silica Scaling be in around of HCE-31 and DNG-10. Furthermore, Dieng development is possible in north-east area which show in clay cap and heat source existence in Sileri Upflow Zone., Volcanic geothermal systems, high temperature and liquid dominated Dieng has a potential of 355 MWe covers an area Sileri, Sikidang-Merdada and Pakuwaja. Until currently operates power plants with a capacity of 1x60 MW supplied by steam from wells in Sileri area. Re-evaluation of Dieng development strategy in integrated to seek the extension of field development by assessing the geochemical data of manifestations and wells, geophysical data and geological data. Geochemical studies include water, gas and isotope to describe reservoir chemical characteristic, supported by a 2D model of Magnetotelluric (MT) which describes the distribution of subsurface resistivity, 2D model of Gravity depicting subsurface structures, and supported by geological structure, vulkanostratigrafy and hydrothermal alteration. There are two main upflow zone in Sileri and Sikidang. Acid zone shown at magmatic fluid existence, enrich of 18O and approximate the andesitic water zone in around DNG-2 and DNG-8. Safe Zone of Silica Scaling be in around of HCE-31 and DNG-10. Furthermore, Dieng development is possible in north-east area which show in clay cap and heat source existence in Sileri Upflow Zone.]

Abstrak :
Keberadaan struktur dalam lapangan geothermal mempunyai peranan penting untuk terbentuk zona reservoir terutama untuk lapangan geothermal non vulkanis. Hal ini dikarenakan struktur tersebut akan membentuk zona fracture sehingga formasi batuan yang ada disekitarnya menjadi permeable. Inversi 2D magnetotelurik dan forward 2D gravity merupakan salah satu metode yang mutakhir untuk menentukan pola struktur dan zona permeabel dalam sistem panas bumi, tentu saja dengan didukung data geologi dan geokimia. Dari hasil analisa dari kedua metode tersebut di atas, diketahui bahwa struktur sesar Palu Koro dan Sesar Bora sebagai sesar utama yang membentuk reservoar panas bumi. Hal ini diperkuat dengan analisa geokimia dimana suhu reservoar pada daerah tersebut berkisar 2000C dengan kedalam sekitar 1500-2000 meter dengan mata air panas Bora sebagai Up flow. Dari hasil perhitungan cadangan dengan metode volumetrik, didapatkan potensi yang dapat dikembangkan sekitar 52 MW dengan luas zona prospek 26 km2.

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Geological structure in geothermal field have important to develop reservoir zone especialy ini non volcanic system. It caused by the structure might created fracture zone to increase permeability. 2D Inversion of magnetotelluric and forward 2D modeling of gravity are currently method to define structure and permeable zone in geothermal system which is supported by geochemistry and geological data. From the analysis of both method, known if Palu Koro fault and Bora fault is main structure to made reservoir zone. The geochemist analysis shown if temperature in reservoir is 2000C where Bora hot spring as up flow with 1500-2000 of depth. There was about 52 MW can be developed in Bora area counted by volumetric method with 26 Km2 extensive.

Abstrak :
Tahapan eksplorasi masih menyimpan tantangan terbesar dan memiliki resiko yang tinggi bagi para pelaku industri bidang geothermal. Oleh karena itu, diperlukan pemahaman yang baik mengenai kondisi bawah-permukaan dengan mengintegrasikan data geosains yang memiliki kualitas yang bagus. Target utama dari eksplorasi yaitu penentuan lokasi pemboran dengan tingkat kepastian yang lebih tinggi. Pemboran diarahkan pada area yang memiliki temperatur dan permeabilitas yang tinggi. Distribusi temperatur bawah permukaan dapat didekati dari nilai resistivitas yang diperoleh dari data MT. Sementara zona dengan permeabilitas yang tinggi, berasosiasi dengan struktur geologi. Pemetaan geologi hanya dapat menggambarkan struktur geologi di permukaan, sementara kemenerusannya di bawah-permukaan menjadi kesulitan tersendiri untuk dideteksi. Penelitian ini difokuskan pada identifikasi struktur geologi bawah-permukaan menggunakan data Magnetotellurik (MT) dan Gravitasi. Analisis pola spliting kurva, arah elongasi polar diagram, serta pencitraan struktur di bawah-permukaan dengan melihat hasil inversi 3-dimensi, yang diperoleh dari data MT, serta didukung oleh hasil pemodelan data Gravitasi, merupakan metodologi yang digunakan dalam penelitian ini. Data geologi dan geokimia, dilibatkan sebagai data pendukung untuk membuat analisis keberadaan struktur geologi bawah-permukaan ini menjadi lebih komprehensif. Tahap akhir dari penelitian ini adalah memberikan rekomendasi dalam menentukan lokasi pemboran, dengan sebelumnya membuat model konseptual dan mendelineasi daerah prospek. Hasil analisis struktur, model konseptual, dan delineasi daerah prospek, menghasilkan rekomendasi tiga buah sumur eksplorasi. Dua sumur mengarah pada upflow di Gunung ?X?, dan satu sumur mengarah pada upflow di scoria cone.

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Exploration stage still holds the biggest challenges and have a high risk for the geothermal industry. Therefore, required a good understanding of subsurface conditions by integrating the geoscientific data that has a high quality. The main target of exploration is the determination of drilling trajectory. The subsurface drilling target is actually directed to high temperature and high permeability zone. Subsurface temperature distribution can be approximated from the resistivity values obtained from the data MT. While the zones with high permeability, associated with geological structures. Geological mapping could only figure out geological structures indicated at the surface. However, continuation of the geological structure into the subsurface is difficult to detect. This study focused on the identification of subsurface geological structure using Magnetotelluric (MT) and gravity data. Splitting pattern analysis from MT curve, the elongation of orientation of polar diagrams, as well as imaging of subsurface structures by looking at the results of 3-dimensional inversion, the data obtained from MT, and supported by the results of Gravity data modeling, a methodology used in this study. Geological and geochemical data, were included as supporting data to make the analysis of the presence of subsurface geological structure has become more comprehensive. And the final stage of this research is to provide recommendations in determining the location of drilling, by first making a conceptual model of the geothermal system and delineating the prospect area. The result of structure analysis, conceptual model, and prospect delineation, provide three exploration wells for recommendation. The first two will be directed to upflow at Mount ?X?, and the other one to upflow at scoria cone.