Analisis Anomali Gravitasi Sebagai Acuan Dalam Penentuan Struktur Geologi Bawah Permukaan Dan Daerah Potensi Panas Bumi (Studi Kasus Gunung Api Ijen)

Dwi, Shine Eliza (2024) Analisis Anomali Gravitasi Sebagai Acuan Dalam Penentuan Struktur Geologi Bawah Permukaan Dan Daerah Potensi Panas Bumi (Studi Kasus Gunung Api Ijen). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Daerah panas bumi Gunung Api Ijen yang termasuk (Geothermal Working Area / GWA) merupakan salah satu daerah berpotensi panas bumi yang terletak di Blawan-Ijen (Gunung Api Ijen), yang secara geografis terletak di 7°59'9"S - 114°10'32"E di desa Kalianyar, Kecamatan Sempol, Kabupaten Bondowoso dengan manifestasi permukaan berupa mata air panas yang diduga merupakan sumber panas bumi. Penelitian ini menggunakan metode gravity dengan data sekunder TOPEX. Data tersebut selanjutnya diolah untuk mendapatkan anomali Bouguer Lengkap yang kemudian dipisahkan menggunakan filter Butterworth dan Bandpass sehingga diperoleh anomali regional dan residual. Anomali Bouguer Lengkap digunakan sebagai input pemodelan inversi 3D. Anomali Bouguer Lengkap (ABL) di daerah Kompleks Gunung Api Ijen bernilai 18 – 153,5 g/cm3 . Lalu untuk hasil inversi 3D, ditemukan adanya batuan beku intrusif yang diperkirakan menjadi sumber panas memiliki nilai densitas tinggi antara 2,72 – 3 g/cm3 yang berada di bagian selatan dan timur dengan kedalaman >2 km, sedangkan batuan yang berdensitas rendah ditemukan di beberapa tempat diinterpretasikan sebagai zona patahan memiliki nilai densitas antara 1,9 – 2,17 g/cm3 . Keduanya menunjukkan adanya struktur geologi berupa kawah pada kerucut gunung Api mengindikasikan keberadaan heat source di bagian selatan kaldera. Struktur geologi lain berupa sesar atau rekahan menjadi faktor utama pembentuk permeabilitas sekunder sehingga dapat diperkirakan terdapat daerah reservoir
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The Ijen Volcano geothermal area which is included (Geothermal Working Area / GWA) is one of the geothermal potential areas located in Blawan-Ijen (Ijen Volcano), which is geographically located at 7°59'9"S - 114°10 '32"E in Kalianyar village, Sempol District, Bondowoso Regency with surface manifestations in the form of hot springs which are thought to be geothermal sources. This research uses the gravity method with TOPEX secondary data. The data is then processed to obtain Complete Bouguer anomalies which are then separated using Butterworth and Bandpass filters to obtain regional and residual anomalies. Complete Bouguer Anomalies are used as input for 3D inversion modeling. Complete Bouguer Anomaly (ABL) in the Ijen Volcano Complex area has a value of 18 – 153.5 g/cm3. Then for the 3D inversion results, it was found that there were intrusive igneous rocks It is estimated to be a heat source with a high density value of between 2.72 – 3 g/cm3 in the southern and eastern parts with a depth of >2 km, while low density rocks found in several places are interpreted as a fault zone with a density value of between 1.9 – 2.17 g/cm3. Both show the presence of a geological structure in the form of a crater on the volcanic cone, indicating the presence of a heat source in the southern part of the caldera. Other geological structures in the form of faults or fractures are the main factors forming secondary permeability so that it can be estimated that there is a reservoir area

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Anomali Bouguer, Gunung Ijen, Metode Gravitasi, Panas Bumi, Pemodelan 3D, Potensi Panas Bumi; Bouguer Anomaly, Mount Ijen, Gravity Method, Geothermal, 3D Modeling, Geothermal Potential
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1199.5 Geothermal resources
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Shine Eliza Dwi
Date Deposited:	16 Feb 2024 02:48
Last Modified:	16 Feb 2024 02:48
URI:	http://repository.its.ac.id/id/eprint/107335

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