Ibrahim, Amanda Isranadha (2024) Pemodelan Data Magnetotelurik untuk Identifikasi Sistem Panas Bumi Lapangan "AMB": Pendekatan Gabungan dengan Data Pendukung Gravity Satelit. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sebuah sistem panas bumi dapat diidentifikasi dengan adanya keberadaan heat source atau sumber panas, reservoir, fluida panas, caprock dan struktur. Metode geofisika untuk mengidentifikasi komponen sistem panas bumi tersebut dapat menggunakan metode magnetotelurik dan metode gravity. Metode magnetotelurik adalah metode geofisika yang dapat melihat distribusi nilai resistivitas bawah permukaan, sedangkan metode gravity adalah metode geofisika yang memetakan persebaran densitas bawah permukaan dimana penelitian tugas akhir ini menggunakan data gravity satelit. Hasil pemodelan magnetotelurik menggambarkan sistem panas bumi lapangan “AMB” berkembang di dalam kaldera (diameter 9 km) dengan lapisan clay cap sebagai caprock memiliki ketebalan rata-rata 1500 m pada kedalaman dangkal dengan nilai resistivitas rendah yang memiliki rentang 0-13 Ohmm. Lapisan clay cap tersebar di dalam kaldera utama sistem panas bumi lapangan “AMB” hingga keluar batas kaldera. Zona reservoir memiliki rentang nilai resistivitas 13-114 Ohmm ditemukan menebal di dalam kaldera KLT. Sedangkan, nilai resistivitas tinggi >114 Ohmm diindentifikasi sebagai zona reservoir sistem panas bumi purba yang tersebar di luar kaldera KLT pada sistem panas bumi yang berkembang saat ini. Kenampakan kaldera KLT dapat terlihat dari pola sirkular anomali tinggi dengan rentang 0,1 mGal hingga 3,8 mGal pada bagian tengah peta anomali residual gravity. Selain itu, ditemukan kenampakan pola sirkular dengan dimensi yang lebih besar dan diidentifikasi sebagai kaldera sistem panas bumi purba lapangan “AMB”. Struktur sesar SGB yang membatasi sistem panas bumi di bagian barat terlihat dari kontras anomali densitas tinggi dan rendah pada peta anomali residual gravity.
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A geothermal system can be identified by the presence of a heat source, reservoir, hot fluid, caprock and structure. Geophysical methods to identify the components of the geothermal system can use the magnetotelluric method and the gravity method. The magnetotelluric method is a geophysical method that can see the distribution of subsurface resistivity values, while the gravity method is a geophysical method that maps the distribution of subsurface density where this final project research uses satellite gravity data. The results of magnetotelluric modeling describe the "AMB" field geothermal system developing in a caldera (diameter 9 km) with a clay cap layer as a caprock having an average thickness of 1500 m at shallow depths with low resistivity values ranging from 0-13 Ohmm. The clay cap layer is spread in the main caldera of the "AMB" field geothermal system to the outside of the caldera. The reservoir zone has a resistivity value range of 13-114 Ohmm found thickened in the KLT caldera. Meanwhile, high resistivity values >114 Ohmm are identified as ancient geothermal system reservoir zones spread outside the KLT caldera in the currently developing geothermal system. The appearance of the KLT caldera can be seen from the circular pattern of high anomalies with a range of 0.1 mGal to 3.8 mGal in the middle of the residual gravity anomaly map. In addition, the appearance of a circular pattern with a larger dimension was found and identified as the ancient geothermal system caldera of the "AMB" field. The SGB fault structure that limits the geothermal system in the west can be seen from the contrast of high and low density anomalies on the residual gravity anomaly map.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | gravity satelit, gravity satellite, geothermal system, magnetotelluric, magnetotelurik, modelling, pemodelan |
| Subjects: | Q Science > QB Astronomy > QB336 Gravity anomalies Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Amanda Isranadha Ibrahim |
| Date Deposited: | 12 Aug 2024 07:37 |
| Last Modified: | 12 Aug 2024 07:37 |
| URI: | http://repository.its.ac.id/id/eprint/113042 |
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