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IDENTIFIKASI SISTEM KELURUSAN DI TAPAK BANTEN MENGGUNAKAN DATA CITRA SATELIT SPOT-5 Yuliastuti Yuliastuti; Heni Susiati; Yunus Daud; Achmad Sarwiyana Sastratenaya
Jurnal Pengembangan Energi Nuklir Vol 15, No 1 (2013): Juni 2013
Publisher : Pusat Kajian Sistem Energi Nuklir, Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jpen.2013.15.1.1613

ABSTRAK IDENTIFIKASI SISTEM KELURUSAN DI TAPAK BANTEN MENGGUNAKAN DATA CITRA SATELIT SPOT-5. Telah dilakukan studi identifikasi sistem kelurusan di tapak Banten menggunakan data citra satelit SPOT-5. Berdasarkan hasil survei tapak regional di Pulau Jawa, Banten merupakan salah satu calon tapak potensial. Tujuan studi untuk menentukan arah dan kronologi pembentukan kelurusan morfologi regional yang berhubungan dengan sesar atau pensesaran di calon tapak tersebut. Metodologi yang digunakan mencakup pemotongan citra satelit, pemilihan band, edge enhancement filtering, ekstraksi kelurusan dan analisis kelurusan. Hasil studi menunjukkan adanya tiga kelompok arah kelurusan regional yang cukup dominan, yaitu arah Utara-Selatan, Baratlaut-Tenggara, dan Timur-Barat. Berdasarkan kronologinya, kelompok kelurusan Utara-Selatan merupakan kelompok kelurusan yang paling tua diikuti arah Timur-Barat dan yang termuda adalah arah Baratlaut-Tenggara. Kelompok-kelompok kelurusan tersebut dapat dikonfirmasi sebagai manifestasi dari sistem sesar. Kata kunci: Citra satelit, kelurusan, sesar, survei tapak ABSTRACT LINEAMENT SYSTEMS INDENTIFICATION IN BANTEN SITE USING SPOT 5 SATTELITE IMAGE. Lineament systems identification in Banten site using SPOT 5 satellite image has been performed. Based on regional site survey in Java Island, Banten is one of the potential candidate sites. The objective of this study was to determine direction and chronology of regional lineament morphology which was consider as fault or faulting in Banten site. The methodology used in this study covered satellite image cropping, band selection, edge enhancement filtering, lineament extraction and lineament analysis. Result of the study showed that there were three dominant lineament groups, namely N-S, NW-SE, and E-W. Based on the forming chronology of the lineament, N-S group was the oldest one, followed by E-W group and NW-SE as the youngest group. These lineament groups have been confirmed as a manifestation of fault system structure. Keywords: Faults, lineaments, site survey, satellite image

Identifikasi Potensi Sistem Panasbumi Berdasarkan Korelasi Data Geologi Dan Data Gravitasi Dengan Menggunakan Teknik Filtering First Horizontal Derivative (FHD) - Second Horizontal Derivatif (SVD) Syafrima Wahyu; Yunus Daud; Tony Rahadinata; Sari Sekar Ningrum
Jurnal Teknologi Vol 7, No 1 (2019): Jurnal Teknologi
Publisher : Universitas Jayabaya

Daerah panasbumi “Z” dalam tatanan tektoniknya termasuk pada jalur back-arc Sumatera, tepat pada salah satu segmen sesar Sumatera bagian selatan, disusun oleh batuan vulkanik dan sedimen klastik yang berumur Tersier hingga Kuarter (Andesit-Basalt). Gejala adanya potensi sistem panasbumi pada daerah penelitian ditandai dengan kemunculan manifestasi permukaan berupa alterasi dan lima mata air panas bersuhu 44,4 – 92,5 oC dan pH antara 8,19 – 9,43. Pengolahan Data gravitasi menggunakan teknik pemisahan Complete Bouguer Anomali (CBA), filtering First Horizontal Derivative (FHD) dan filtering Second Vertical Derivative (SVD) untuk mengetahui kemungkinan lokasi sumber panas dan letak bidang kontak terjadinya anomali serta jenis sesarnya. Berdasarkan slicing lintasan FHD dan SVD, struktur pada peta geologi didominasi oleh sesar naik dan sesar normal yang bersifat regional, serta struktur dengan kompleksitas tinggi yang bersifat lokal. Kemunculan manifestasi permukaan sistem panasbumi berada disekitar nilai anomali residual gravitasi tinggi (8 – 24 mgal) yang mengindikasikan terdapatnya batuan yang kompak dan massif. Diperkirakan sistem panasbumi daerah penelitian termasuk jenis tektonik fracture zone serta anomali tinggi yang berada di sekitar APZ1-APZ2-APZ3 tersebut terdapat batuan intrusi yang berperan penting sebagai sumber panas.

Delineasi Zona Prospek Sistem Panasbumi Daerah ‘P’ Menggunakan Pemodelan Multi Dimensi Data Magnetotelurik Terintegrasi Data Geologi dan Geokimia Puji Suharmanto; Yunus Daud; ahmad zarkasyi
Faktor Exacta Vol 11, No 3 (2018)
Publisher : LPPM

A study for delineating geothermal system of prospect area “P” has been done by using multi-dimensional modeling of magnetotelluric data. Physiographycally, geothermal prospect of “P” area is located at non-volcanic Banda inner arc hosted by Malihan Sekis rock complex with Perm-Trias age. The existance of geothermal system in this area is indicated by the presence of thermal manifestations in form of 6 chloride-bicarbonate hot springs with temperature in the the range of 37-67oC, and pH of 6-7. The development of geothermal system is most probably associated with strong tectonic activity caused by the collision between Seram island plate and Australian plate that ignite the occurence of intrussive body as heat source. In order to know the subsurface information of prospect area, magnetotelluric (MT) survey has been done. The processing of MT data was started from time-series data, continued by noise filtering, rotation of strike orientation and static shift correction to obtain better MT curve. The data were then being inversed by means of 1-Dimensional, 2-Dimensional and 3-Dimensional inversion methods. Reservoir temperature is estimated to be around 160-180 oC and classified as moderate temperature. The result of MT data inversions shows the presence of conductive layer (<15 ?m) with 500-1000 m thickness that is interpreted as clay cap og geothermal system. High resistivity zone (>300 ?m) with updome shape appears underneath the manifestations occurence (MAP1, MAP2, MAP4, and MAP5), indicating that the heat source is located in northern part and elongate to souteast direction. The conceptual model of geothermal system was built based on integrated interpretation of geological, geochemical and geophysical data. The prospect area and recommendation of drilling location is estimated to be ± 3 km2 around upflow zone.Keywords: Prospect zone, geothermal system, magnetotelluric method, multi-dimension modeling

KARAKTERISTIK GEOTEKNIK STASIUN ACCELEROMETER TANJUNG PRIOK (JATA) DAN DEPOK (JAUI) Widjojo A. Prakoso; Yunus Daud; Surya Aji Pratama
Jurnal Meteorologi dan Geofisika Vol 12, No 2 (2011)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v12i2.98

Karakteristik geoteknik hingga kedalaman 30 m lokasi accelerometer yang berada di lingkungan Stasiun Meteorologi Maritim Klas I Tanjung Priok, Jakarta (JATA) dan yang berada di lingkungan Fakultas Matematika dan Pengetahuan Alam Universitas Indonesia, Depok (JAUI) dibahas dalam makalah ini. Karakteristik geoteknik ditentukan melalui uji fisik berupa uji cone penetrometer, deskripsi visual-manual contoh tanah dari hasil bor dalam, dan uji standard penetration serta melalui uji geofisik berupa uji seismic downhole. Keempat uji tersebut kemudian dievaluasi untuk membuat model dan melakukan analisis karakteristik geoteknik. Kecepatan rambat gelombang geser rata-rata berbobot stasiun JATA adalah 188,1 m/s dan termasuk dalam jenis "Tanah Sedang", tetapi analisis lebih lanjut perlu dilakukan. Kecepatan rambat gelombang geser rata-rata berbobot stasiun JAUI adalah 239,8 m/s dan termasuk dalam jenis "Tanah Sedang". Geotechnical characteristics to a depth of 30 m for accelerometer location within Stasiun Meteorologi Maritim Klas I Tanjung Priok, Jakarta (JATA) and for accelerometer location within FMIPA Campus of Universitas Indonesia, Depok (JAUI) are discussed in this paper. Geotechnical characteristics were evaluated based on phyisical test results of cone penetration tests, visual-manual soil evaluation, standard penetration tests, and geophysical test results of seismic downhole tests. From these four tests, for each location, a geotechnical characteristic model was developed and a geotechnical characteristic analysis was performed. Weighted average of shear-wave velocity of JATA station was found to be 188,1 m/s and can be classified as "Stiff Soil", but it appears that a further characterization study needs to be conducted. Weighted average of shear-wave velocity of JAUI station was found to be 239,8 m/s and can be classified as "Stiff Soil".

RELOKASI GEMPABUMI MENGGUNAKAN METODE TELESEISMIK DOUBLE DIFFERENCE DI WILAYAH JAWA Tio A. P. Setiadi; Yunus Daud; Agustya Adi Martha; Supriyanto Rohadi
Jurnal Meteorologi dan Geofisika Vol 23, No 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v23i1.842

Relokasi hiposenter penting dilakukan untuk mendapatkan lokasi gempabumi yang akurat untuk studi relostruktur tektonik secara detail, seperti identifikasi pola bidang patahan, pola zona subduksi, dan identifikasi batas lempeng. Salah satu metode relokasi hiposenter terbaru adalah metode teleseismic Double-Difference (teletomoDD) yang menggunakan koordinat spherical model dan kecepatan seismik 3D. Penelitian ini dilakukan dengan merelokasi gempabumi yang terjadi di sekitar wilayah Jawa. Jumlah gempabumi yang direlokasi sebanyak 3570 dari 3653 event. Hasil dari relokasi hiposenter menunjukkan hiposenter yang lebih baik, yaitu gempabumi dengan kedalaman tertentu (fixed depth = 10 km) telah terelokasi dan distribusi hiposenter yang didapat menunjukkan pola penunjaman yang berasosiasi dengan pola subduksi dan patahan aktif di Pulau Jawa.

Bahasa Inggris KORELASI ANTARA PEMODELAN INVERSI 3-D MAGNETOTELLURIK DENGAN DATA SUMUR DI LAPANGAN PANAS BUMI PATUHA: CORRELATION BETWEEN 3-D MAGNETOTELLURIC INVERSION MODEL WITH DRILLING DATA IN PATUHA GEOTHERMAL FIELD Chevy Iskandar; Yunus Daud
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): 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.v17i1.328

The Patuha geothermal field is located in West Java Province, Indonesia and developed by state owned company PT Geo Dipa Energi (Persero). The Commercial Operation Date (COD) for Patuha was in September 2014 with plant capacity of 1x60 MW. Until now, Patuha Unit I geothermal field has been running for almost 7 years. The current production wells have experienced a natural decline, which is showed by a reduction in production capacity to the initial production. This causes the steam supply to the Power Plant Unit I to be not optimal, so a make-up well program is needed. Furthermore, to support the addition of electricity production capacity from geothermal energy in Indonesia, the development of the Patuha Geothermal Field is planned to be carried out for the next Power Plant Unit’s expansion (Unit 2 and Unit 3). Nevertheless, determining the location for both make-up and development drilling might still pose high risks. This is especially because the development area (where production and injection wells are located) is only concentrated in the eastern area of the contract area. Geophysical data especially Magnetotelluric (MT) has an indispensable role considering the limited data and the limited number of existing wells that cover the entire Patuha prospect area. To understanding the subsurface feature and see the correlation between MT model with well results in Patuha Geothermal Field, MT and TDEM survey were conducted in the eastern and western parts of Patuha area with total 100 stations. Considering the complexity of the subsurface condition in volcanic area, 3-D inversion of the MT data will be the most representative approach to investigate geothermal system in Patuha Geothermal Field. An obvious subsurface resistivity distribution revealed by the 3-D inversion showed a good agreement with well results especially in mapping the temperature distribution both vertically and horizontally. Generally, the resistivity distribution consists of a conductive zone (1–10 ohm-m) at the shallow part overlying a reservoir zone with a rather higher resistivity range (20–60 ohm-m). The conductive zone (<10 ohm-m) is correlated with Base of Conductor (BOC) of the wells that indicated by the presence of the argillic mineral. Meanwhile, the resistivity value around 15-20 ohm-m is correlated with Top of Reservoir of the production or injection well which is characterized by the presence of a convective temperature. In addition, from the results of resistivity mapping there is a very good correlation also in determining of reservoir boundary which is characterized by the presence of reverse temperature from the well. These results can be used as a guidance for better development strategy and drilling prognosis for the next drilling campaign especially in the area which limited number of wells.

KARAKTERISASI STRUKTUR PATAHAN PADA LAPANGAN PANAS BUMI X (SUMATRA) BERDASARKAN PEMETAAN GEOLOGI, PENGINDERAAN JAUH, DAN DATA GAYA BERAT: FAULTS CHARACTERIZATION IN X GEOTHERMAL FIELD (SUMATRA) BASED ON GEOLOGICAL MAPPING, REMOTE SENSING AND GRAVITY DATA Sri Mulyani; Yunus Daud; Riza G. Pasiki; Haris Siagian
Buletin Sumber Daya Geologi Vol. 17 No. 2 (2022): 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.v17i2.327

Fault structure plays an important role in a geothermal system. Faults can be weak zones that are the location of intrusions that are related with heat sources, the location of permeability for reservoar, and as the fluid flow path to the surface that appears as manifestation. By understanding the characterization and distribution of geological structures in geothermal fields, the conceptual model of geothermal systems can be better understood, so the risk of counter-inaccuracies in the development of geothermal at the subsurface can be minimized. Field X is located on the Sumatra Island, known as development field that still trying to get the optimal well location for production. This study reveals how to identify faults in Geothermal Field X using gravity data analysis, remote sensing and geological mapping results. In detail, the gravitational data analysis includes checking the quality data, calculating and mapping of the residual and regional data, FHD, SVD, and 3D gravity modelling. Remote sensing data that analysed in the form of LIDAR rendering data, data used from geological mapping results are location and strike of faults. The results of this study are model and map of the faults distribution in geothermal field X that can be used as reference to understand the geothermal system, as well as the guidance for the well targeting.

RELOKASI GEMPABUMI MENGGUNAKAN METODE TELESEISMIK DOUBLE DIFFERENCE DI WILAYAH JAWA Tio A. P. Setiadi; Yunus Daud; Agustya Adi Martha; Supriyanto Rohadi
Jurnal Meteorologi dan Geofisika Vol. 23 No. 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v23i1.842

Relokasi hiposenter penting dilakukan untuk mendapatkan lokasi gempabumi yang akurat untuk studi relostruktur tektonik secara detail, seperti identifikasi pola bidang patahan, pola zona subduksi, dan identifikasi batas lempeng. Salah satu metode relokasi hiposenter terbaru adalah metode teleseismic Double-Difference (teletomoDD) yang menggunakan koordinat spherical model dan kecepatan seismik 3D. Penelitian ini dilakukan dengan merelokasi gempabumi yang terjadi di sekitar wilayah Jawa. Jumlah gempabumi yang direlokasi sebanyak 3570 dari 3653 event. Hasil dari relokasi hiposenter menunjukkan hiposenter yang lebih baik, yaitu gempabumi dengan kedalaman tertentu (fixed depth = 10 km) telah terelokasi dan distribusi hiposenter yang didapat menunjukkan pola penunjaman yang berasosiasi dengan pola subduksi dan patahan aktif di Pulau Jawa.

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