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"Aktivitas geotermal pada daerah X telah ditemukan melalui keberadaan manifestasi panas bumi yang sangat impresif di beberapa titik. Beberapa penelitian yang dilakukan di daerah ini bertujuan untuk menemukan lokasi dan karakteristik reservoir utama sistem geotermal yang ada di area prospek. Namun, beberapa hasil interpretasi yang ditemukan ambigu dikarenakan penggunaan metode survei yang tidak tepat. Dalam penelitian ini, model konseptual yang terintegrasi dari metode magnetotellurik, geokimia, dan geologi digunakan untuk mendelineasi zona reservoir, karakteristik fluida reservoir, dan temperatur reservoir. Berdasarkan hasil konstruksi model konseptual, reservoir sistem geotermal di daerah penelitian ini ditemukan menggunakan metode magnetotellurik berada tepat di bawah tubuh gunung A. Keberadaan manifestasi fumarol di puncak gunung A, tepatnya di kawah gunung A yang mengalami perluasan ke arah timur laut dan sebagian ke arah barat laut, memvalidasi hasil ini. Temperatur pada reservoir mencapai 310°C, dengan sumber panas yang berasal dari gunung A muda. Area prospek diperkirakan sekitar 24 km dengan top of reservoir pada elevasi 1000 meter. Berdasarkan hasil ini, pengeboran eksplorasi dengan tipe sumur standard hole direkomendasikan untuk memvalidasi hasil eksplorasi 3G (geofisika, geokimia, geologi), yang akan ditajak pada kedalaman 2000 meter.

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Geothermal activity in area X has been identified through the presence of impressive manifestations of geothermal activity at several points. Several studies conducted in this area aimed to locate and characterize the main reservoir of the geothermal system present in the prospect area. However, some of the interpreted results were ambiguous due to the improper use of survey methods. In this study, a conceptual model integrated from magnetotelluric, geochemical, and geological methods was used to delineate the reservoir zone, fluid reservoir characteristics, and reservoir temperature. Based on the constructed conceptual model, the geothermal reservoir system in this study area was found to be located precisely beneath the base of Mount A using the magnetotelluric method. The presence of fumaroles at the summit of Mount A, specifically in the Kawah Mount A, which is expanding towards the east-northeast and west-northwest, validates these results. The reservoir temperature reaches 310°C, with the heat source originating from the young Mount A. The prospect area is estimated to be approximately 24 km with a top of reservoir at an elevation of 1000 meters. Based on these results, drilling exporation with a standard hole type is recommended to validate the 3G exploration results (geophysics, geochemistry, geology), which will be drilled to a depth of 2000 meters."

"Pusuk Buhit adalah salah satu lapangan di Indonesia dengan potensi geotermal, dibuktikan oleh keberadaan fumarole, hot spring, dan cold spring. Penelitian bertujuan membangun model konseptual yang menggambarkan komponen-komponen sistem geotermal fokus wilayah penelitian yang belum ada sebelumnya, menggunakan data primer geofisika dan data sekunder geologi dan geokimia. Inversi 3-dimensi magnetotellurik mampu menggambarkan komponen sistem geotermal dari variasi resistivitas. Claycap memiliki resistivitas 0-16 Ωm, reservoir 16-80 Ωm, dan basement 80-300 Ωm, dengan pola updoming di antara basement diduga sebagai sumber panas. Model gravitasi 2-dimensi digunakan untuk mengkonfirmasi jalur fluida ke zona reservoir dan nilai densitas dari komponen sistem geotermal, dengan lapisan piroklastik densitas 1.92 gr/cc, batuan gamping 2.3-2.4 gr/cc, dan batuan dasar metamorf 2.7 gr/cc, yang menunjukkan korelasi dengan model magnetotellurik. Kedua metode didukung data geologi yang menunjukkan korelasi antara struktur dengan manifestasi permukaan, serta data geokimia yang menunjukkan fluida reservoir bertipe bikarbonat, suhu di reservoir 240-270°C, dan pergerakan fluida lateral ke arah manifestasi air, serta upflow menuju fumarole. Integrasi data menunjukkan area prospek geotermal berada di bawah lapisan batuan teralterasi konduktif di antara struktur graben wilayah penelitian.

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Pusuk Buhit is one of the fields in Indonesia with geothermal potential, evidenced by the presence of fumaroles, hot springs, and cold springs. The research aims to build a conceptual model depicting the components of the geothermal system in the focus area, which has not been previously studied, using primary geophysical data and secondary geological and geochemical data. The 3-dimensional magnetotelluric inversion can illustrate the geothermal system components based on resistivity variations. The clay cap has a resistivity of 0-16 Ωm, the reservoir 16-80 Ωm, and the basement 80-300 Ωm, with an updoming pattern within the basement suspected to be the heat source. A 2- dimensional gravity model is used to confirm fluid pathways to the reservoir zone and the density values of the geothermal system components, with pyroclastic layers having a density of 1.92 gr/cc, limestone 2.3-2.4 gr/cc, and metamorphic basement rocks 2.7 gr/cc, which show correlation with the magnetotelluric model. Both methods are supported by geological data showing a correlation between structures and surface manifestations, as well as geochemical data indicating bicarbonate-type reservoir fluids, reservoir temperatures of 240-270°C, lateral fluid movement towards water manifestations, and upflow towards fumaroles. Data integration indicates that the geothermal prospect area is located beneath the conductive altered rock layer within the graben structures of the study area."

"Pulau Sumatera memiliki potensi panas bumi yang signifikan, namun informasi detail mengenai sebaran reservoir serta karakteristik fluida di beberapa area prospek masih terbatas sehingga memerlukan kajian lebih mendalam. Penelitian ini bertujuan untuk mendelineasi potensi panas bumi dan mengkarakterisasi sistem reservoir di lapangan panas bumi “YRS” melalui integrasi metode inversi magnetotellurik (MT) tiga dimensi dan analisis geokimia fluida. Daerah penelitian terletak pada zona pull-apart basin yang terbentuk akibat aktivitas Sesar Sumatera dan sesar turunannya, yang berperan sebagai jalur migrasi fluida hidrotermal. Akuisisi data MT dilakukan pada 3 lintasan pengukuran dan diolah melalui tahapan seleksi time-series, transformasi Fourier, robust processing, seleksi cross power, koreksi static shift, hingga inversi 3 dimensi. Analisis geokimia dilakukan terhadap parameter ion balance, komposisi kimia air, dan isotop stabil dari beberapa manifestasi panas bumi di permukaan. Hasil pemodelan resistivitas menunjukkan adanya zona konduktif dengan nilai resistivitas <15 Ωm yang diinterpretasikan sebagai graben infill, menutupi zona resistivitas sedang 16–63 Ωm yang diasosiasikan sebagai reservoir geotermal dengan top reservoir teridentifikasi pada kedalaman sekitar -500 mdpl. Zona resistivitas tinggi >158 Ωm diduga merupakan batuan basement, sedangkan heat source berada pada elevasi lebih dari -1500 mdpl. Analisis geokimia menunjukkan fluida bertipe immature water dengan dominasi ion bikarbonat serta indikasi pencampuran dengan air meteorit, yang mencerminkan sistem outflow yang belum setimbang dengan batuan reservoir. Integrasi data geofisika, geokimia, dan geologi menghasilkan model konseptual sistem panas bumi bertipe fault-controlled pada zona pull-apart basin, yang dikontrol oleh aktivitas Sesar Sumatera. Temuan ini diharapkan dapat menjadi dasar bagi kegiatan eksplorasi lanjutan dan mendukung pengembangan potensi panas bumi di wilayah penelitian.

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Sumatra Island has significant geothermal potential; however, detailed information regarding reservoir distribution and fluid characteristics in several prospective areas remains limited and requires further investigation. This study aims to delineate geothermal potential and characterize the reservoir system in the “YRS” geothermal field by integrating three-dimensional magnetotelluric (MT) inversion and fluid geochemical analysis. The study area is located within a pull-apart basin formed by the activity of the Sumatra Fault and its subsidiary faults, which serve as migration pathways for hydrothermal fluids. MT data acquisition was conducted along three survey lines and processed through several stages, including time-series selection, Fourier transform, robust processing, cross-power selection, static shift correction, and three-dimensional inversion. Geochemical analysis was carried out on ion balance, water chemistry composition, and stable isotopes from several surface geothermal manifestations. The resistivity model reveals a conductive zone with resistivity values of <15 Ωm, interpreted as graben infill covering a medium-resistivity zone ranging from 16 to 63 Ωm, which is associated with the geothermal reservoir, with the top reservoir identified at a depth of approximately -500 meters above sea level. A high-resistivity zone (>158 Ωm) is interpreted as the basement rock, while the heat source is estimated to be located below -1500 meters elevation. Geochemical interpretation indicates immature water dominated by bicarbonate ions with strong evidence of mixing with meteoric water, reflecting an outflow system that has not yet reached equilibrium with the reservoir rocks. The integration of geophysical, geochemical, and geological data produces a conceptual model of a fault-controlled geothermal system within the pull-apart basin, governed by the activity of the Sumatra Fault. These findings are expected to serve as a basis for further exploration and to support the development of geothermal potential in the study area."