Pemetaan Struktur Bawah Permukaan di sekitar Manifestasi Panas Bumi  Desa Sungai Tutung Kerinci Menggunakan Metode Geomagnetik

Suci, Ratika Tri; Putra, Ardian

doi:10.25077/jfu.10.4.540-547.2021

Cited by 3 publications

(5 citation statements)

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“…Metode ini memiliki keunggulan dimana pengoperasiannya lebih sederhana dan ketelitian yang cukup baik. Data anomali medan magnet telah digunakan dalam memperkirakan keberadaan daerah panas bumi (Daud et al, 2018;Hadi et al, 2020;Maulana et al, 2014;Simbolon et al, 2020;Suci and Putra, 2021). Penggunaan metode ini akan memberikan gambaran umum keberadaan sistem panas bumi di Sumani.…”

Section: Iunclassified

“…Kontinuasi pada ketinggian 100 m digunakan untuk melakukan pemodelan 2D struktur bawah permukaan karena sudah terlihat anomali magnetik regional dan tidak menghilangkan seluruh pengaruh dari anomali magnetik lokal. Hal yang sama juga dilakukan oleh (Suci and Putra, 2021) di daerah panas bumi Desa Sungai Tutung. Hasil kontinuasi ke atas menunjukkan area anomali magnetik negatif atau rendah semakin dominan di daerah selatan Daerah penelitian yang dapat menjadi zona prospek panas bumi.…”

Section: Kontinuasi Ke Atasunclassified

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Interpretasi Sebaran Anomali Magnetik di Daerah Prospek Panas Bumi Sumani, Sumatera Barat

Refiani,

Pohan,

Putra

2023

JFU

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Penelitian ini dilakukan untuk mengetahui sebaran anomali magnetik di daerah panas bumi Jorong Padang Belimbing dengan menggunakan metode geomagnet. Pengambilan data dilakukan menggunakan magnetometer dengan titik amat di 186 titik pengamatan dengan 14 lintasan dan jarak antar titik adalah 100 m. Data anomali magnetik yang didapatkan dikoreksi dengan koreksi harian dan koreksi IGRF, selanjutnya dilakukan reduksi ke kutub dan kontinuasi ke atas. Setelah dilakukan proses pengolahan data, didapatkan nilai anomali total di daerah penelitian antara -1682,8 nT hingga 6739,9 nT yang memiliki beberapa nilai di bawah IGRF. Hal ini diduga karena adanya demagnetisasi batuan akibat adanya sumber panas di bawah permukaan. Pemodelan 2D dilakukan dengan menganalisa anomali medan magnet hasil kontinuasi ke atas dengan ketinggian 100 m. Berdasarkan pemodelan menunjukkan terdapat empat lapisan pada daerah penelitian. Lapisan pertama diindikasikan sebagai aluvium, lapisan kedua diindikasi sebagai aliran piroklastik, lapisan ketiga diindikasikan sebagai satuan lava dan vulkanik tersier yang merupakan batuan penudung (cap rock) dengan kedalaman rata-rata 225 meter hingga 1465 meter di bawah permukaan dan lapisan terakhir diindikasikan sebagai reservoir yang didominasi oleh satuan meta batu gamping. Sumber panas di daerah Padang Belimbing diduga berasal dari aktivitas vulkanik bukit Tinjau Laut. Kata kunci: anomali magnetik cap rock panas bumi sumber panas Keywords: cap rock geothermal hot rock magnetic anomalyThis research was conducted to determine the distribution of magnetic anomalies in the Jorong Padang Belimbing geothermal area using the geomagnetic method. Data collection was carried out using a magnetometer with very points at 186 observation points with 14 tracks and the distance between points was 100 m. The magnetic anomaly data obtained is corrected with daily corrections and IGRF corrections, then reduction is carried out to the poles and continuous upwards. After processing the data, a total anomaly value was obtained in the study area between -1682.8 nT to 6739.9 nT which had several values below the IGRF. This is presumably due to the demagnetization of the rock due to a heat source below the surface. 2D modeling is done by analyzing the magnetic field anomaly resulting from an upward continuation with a height of 100 m. Based on the modeling, it shows that there are four layers in the research area. The first layer is indicated as alluvium, the second layer is indicated as a pyroclastic flow, the third layer is indicated as a tertiary lava and volcanic unit which is a cap rock with an average depth of 225 meters to 1465 meters below the surface and the last layer is indicated as a reservoir. dominated by limestone meta units. The heat source in the Belimbing Padang area is thought to have originated from the volcanic activity of the Tinjau Laut hill.

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Interpretasi Sebaran Anomali Magnetik di Daerah Prospek Panas Bumi Sumani, Sumatera Barat

Refiani,

Pohan,

Putra

2023

JFU

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“…The rock units are as follows: (1) Mandalika Formation volcanic sandstone and breccia; (2) Arjosari Formation volcanic rock and sandstone; (3) igneous diorite rock as an intrusive body; and (4) sedimentary alluvial in the Pacitan River Basin [7]. Lestari [8] conducted a subsurface interpretation study of the Karangrejo hot spring and found volcanic and intrusive igneous rocks. The modeling by Lestari [8] corresponds with the Pacitan geological map which states that the study area consists of the Arjosari and Mandalika formations which are dominated by volcanic breccias and lava.…”

Section: Introductionmentioning

confidence: 99%

“…Lestari [8] conducted a subsurface interpretation study of the Karangrejo hot spring and found volcanic and intrusive igneous rocks. The modeling by Lestari [8] corresponds with the Pacitan geological map which states that the study area consists of the Arjosari and Mandalika formations which are dominated by volcanic breccias and lava. In addition, the andesitic lava was identified as the caprock of the Karangrejo-Tinatar geothermal system.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Subsurface Geological Setting Based on the Gravity Anomalies in Karangrejo-Tinatar Geothermal Area, Pacitan Regency, Indonesia

Puspita,

Aprilla,

Maryanto

et al. 2024

International Journal of Geophysics

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As per the Geothermal Potential Book published by the Ministry of Energy and Mineral Resources (MEMR) in 2017, Pacitan Regency in East Java Province, Indonesia, has the potential for geothermal energy. Two hot spring manifestations, namely, Karangrejo and Tinatar, located in the Arjosari and Punung districts of Pacitan Regency, respectively, have a combined resource of 25 MWe. We acquired ground-gravity data and evaluated gravity anomalies to explore the underlying geological structure in order to understand the geothermal system behind these manifestations. The results of the study show that the gravitational anomaly in the Karangrejo-Tinatar region ranges from 163 to 176 mGal. Additional analysis of the complete Bouguer anomaly (CBA) map, first horizontal derivative (FHD) map, and field observations points to the existence of three NW-SE trending faults. Two of the faults, which are the Karangrejo fault and the Tinatar fault, may be the flow paths for the manifestation of Karangrejo and Tinatar hot springs.

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“…The application of this method is based on the value and distribution of subsurface rock susceptibility which is closely related to the structure and geothermal system [9]- [14] in Kepahiang. The magnetic method is a very effective and efficient application for geothermal exploration because it can determine geothermal prospects by looking at the horizontal and vertical distribution based on rock susceptibility values [9], [11], [12], [14][15][16]. The specific objectives of this study were (1) to map the magnetic anomalies of the geothermal field in Kepahiang, (2) to determine the lithology and rock formations of each layer to the maximum depth obtained from measurements based on rock susceptibility values, (3) the geological structure and its distribution on the administrative map of Kepahiang and its relationship to the activity of Mount Kaba and the Sumatran fault, and (4) the zone of altered rock distribution.…”

Section: Introductionmentioning

confidence: 99%

3D Deliniation of Geological Structure of Kepahiang Geothermal Area, Indonesia

Sugianto¹,

Refrizon

Simbolon

2022

Gravitasi

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Deliniasi 3D struktur geologi daerah prospek Geothermal di Kabupaten Kepahiang telah dilakukan. Tujuan Penelitian adalah untuk mendapatkan gambaran subsurface dan geothermal system di Kepahiang serta memetakan zona alterasinya. Pemodelan kedepan dan inversi dilakukan kepada 194 data geomagnetik telah diukur menggunakan Proton Precission Magnetometer. Hasil analisi mendapati bahwa prospek lapangan geothermal di Kepahiang terdistribusi di Babakan Bogor, Barat Wetan, Pematang Donok, Tangsi Duren, Sido Makmur, dan Air Sempiang dengan kedalaman rata-rata reservoir 900 m dengan jenis batuan lapisan penudung yaitu gabro (ketebalan rata-rata 1100 m). Empat jenis formasi batuan ditemukan diantaranya batuan breksi gunung api, batuan basal, batuan gabro, dan batuan teralterasi. Anomali rendah yang berada di Babakan Bogor, Barat Wetan, Kuto Rejo, Pematang Donok, Tangsi Baru, Sido Makmur dan Air Sempiang diduga disebabkan oleh Sesar Segmen Musi yang masih aktif dan termagnetisasi secara induktif akibat reservoir panas bumi dari aktifitas Gunung Kaba

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Pemetaan Struktur Bawah Permukaan di sekitar Manifestasi Panas Bumi Desa Sungai Tutung Kerinci Menggunakan Metode Geomagnetik

Cited by 3 publications

References 0 publications

Interpretasi Sebaran Anomali Magnetik di Daerah Prospek Panas Bumi Sumani, Sumatera Barat

Interpretasi Sebaran Anomali Magnetik di Daerah Prospek Panas Bumi Sumani, Sumatera Barat

Preliminary Study of Subsurface Geological Setting Based on the Gravity Anomalies in Karangrejo-Tinatar Geothermal Area, Pacitan Regency, Indonesia

3D Deliniation of Geological Structure of Kepahiang Geothermal Area, Indonesia

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