Fitri, Waindini Nur (2019) Pemodelan Inversi 3-D Data Magnetotelurik Pada Lapangan Panas Bumi Arjuno-Welirang Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Gunung Arjuno-Welirang terletak di provinsi Jawa Timur yang merupakan jenis stratovolcano dengan ketinggian 3.339 m untuk Arjuno dan 3.156 m untuk Welirang. Sistem panas bumi Arjuno-Welirang adalah sistem panas bumi vulkanik. Magnetotelurik adalah metode eksplorasi geotermal yang paling umum digunakan karena penetrasi yang dalam dan sensitivitas terhadap zona konduktif. Metode magnetotelurik mengukur 103 titik MT di bidang sistem panas bumi di Selatan Gunung Arjuno-Welirang. Dalam penelitian ini, model 3D inversi data magnetotelurik digunakan untuk mengurangi ambiguitas data magnetotelurik inversi 2D. 3D Model Inversion menggunakan WinGlink dan 3DModEM. Langkah pemrosesan magnetotelurik terdiri dari konversi domain waktu ke domain frekuensi, pemilihan crosspower, data smoothing, koreksi efek statis, 2D dan static strip, interpolasi, masking, dan 3D Inversion, serta interpretasi model inversi. Inversi model 3D terdiri dari parameter grid 3D mesh yang digunakan Algoritma Non Linier Conjugate Gradien. Pemodelan Inversi 2D dilakukan dengan metode NLCG yang menghasilkan model 2D dengan nilai RMS error 1,7%. Pemodelan Inversi 3D dilakukan dengan metode NLCG yang menghasilkan model 2D dengan nilai RMS error 2,83%. Sistem panas bumi wilayah panas bumi Arjuno-Welirang yang terdiri dari lapisan batuan penudung dengan nilai tahanan jenis 5-11 Ωm, zona resistivitas tengah dengan rentang nilai 11-76 Ωm yang berperan sebagai reservoir, dan zona resistivitas tinggi dengan rentang nilai 76-500 Ωm atau biasa disebut dengan heat source. Hasil model inversi 3D menunjukkan terdapat sebuah kemenerusaan rentang nilai tahanan jenis rendah (lapisan batuan penudung) yang memiliki ketebalan dari 1200 m – 1700 meter, nilai tahanan jenis ini terdapat dibawah permukaan dengan ketebalan ± 500-600 m. Sehingga, dapat disimpulkan bahwa di daerah Mt. Arjuno-Welirang adalah daerah prospek panas bumi.
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Arjuno-Welirang Mountain is located in East Java province which is a type of stratovolcano with an altitude of 3,339 m for Arjuno and 3,156 m for Welirang. The Arjuno-Welirang geothermal system is a volcanic geothermal system. Magnetoteluric is the most commonly used geothermal exploration method because of deep penetration and sensitivity to conductive zones. The magnetoteluric method measures 103 MT points in the field of geothermal systems in the South of Mount Arjuno-Welirang. In this study, the 3D inversion model of magnetoteluric data was used to reduce the ambiguity of 2D magnetoteluric inversion data. 3D Model Inversion uses WinGlink and 3DModEM. The steps of magnetoteluric processing consist of time domain conversion to frequency domain, crosspower selection, data smoothing, static effect correction, 2D and static strips, interpolation, masking, and 3D inversion, and interpretation of inversion models. The 3D model inversion consists of 3D mesh grid parameters used by the Non Linear Conjugate Gradient Algorithm. 2D Inversion Modeling is done by the NLCG method which produces a 2D model with an RMS error of 1.7%. 3D Inversion modeling is done by the NLCG method which produces a 2D model with a value of RMS error of 2.83%. The geothermal system of the Arjuno-Welirang geothermal region which consists of a layer of veil rock with a type of resistivity value 5-11 Ωm, a middle resistivity zone with a value range of 11-76 yangm which acts as a reservoir, and a high resistivity zone with a range of 76-500 Ωm or commonly called heat source. The results of the 3D inversion model indicate that there is a range of low resistance types (hood rock layers) that have a thickness of 1200 m - 1700 meters, the value of this type of resistance is below the surface with a thickness of ± 500-600 m. So, it can be concluded that in the Mt. Arjuno-Welirang is a geothermal prospect area.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Magnetotelurik, Arjuno-Welirang, 3D Inversion, Non Linear Conjugate Gradien (NLCG) Algorithm |
| Subjects: | Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Waindini Nur Fitri |
| Date Deposited: | 23 Jul 2026 02:13 |
| Last Modified: | 23 Jul 2026 02:13 |
| URI: | http://repository.its.ac.id/id/eprint/64745 |
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