Cancerio, Catur Rizkillah (2019) Pemodelan Inversi 2-D Data Magnetotelurik Menggunakan Rotasi Tensor Impedansi Pada Lapangan Panas Bumi Arjuno-Welirang. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Prospek panas bumi wilayah Gunung Arjuno dan Gunung Welirang memiliki potensi cadangan terduga sebesar 280 Mwe, namun potensi energi tersebut belum dikembangkan sebagai lapangan produksi panas bumi yang membangkitkan tenaga listrik. Metode MT adalah salah satu metode geofisika pasif yang digunakan dalam eksplorasi panas bumi. Karakteristik sifat pasif tersebut memungkinkan mengukur semua sinyal termasuk yang mengandung noise. Noise tersebut timbul karena kompleksitas dan ketidakhomogenan Bumi, hal tersebut mengakibatkan tensor impedansi yang terukur tidak tegak lurus dengan arah strike. Solusi dari permasalahan tersebut adalah melakukan rotasi terhadap struktur sebelum proses inversi 2D, hal itu dilakukan untuk memenuhi asumsi inversi 2D bahwa strukturnya memanjang. Pada penelitian ini akan melakukan rotasi tensor impedansi berdasarkan ¬geo-electrical strike sebelum pemodelan data. Hasil dari penelitian ini adalah nilai sudut geo-electrical strike yang didapatkan dengan cara analisis terhadap data tipper strike bernilai 500, sehingga dilakukan rotasi tensor impedansi sebesar 500. Sistem panas bumi arjuno-welirang berada pada wilayah Formasi Gunung api Kuarter Bawah (Qp) dan Gunung api Arjuna–Welirang (Qvaw) yang terdiri dari lapisan cap rock dengan nilai resistivitas 5-10 Ωm, batuan penudung pada Formasi Gunung api Arjuna–Welirang tersebut diperkirakan berasal dari produk lava welirang (Qlw) yang telah mengalami proses alterasi, sedangkan batuan penudung pada Formasi Kuarter Bawah diperkirakan berasal dari lava tua produk Welirang (Qlaw) yang masif dan belum terekahkan secara kuat. Lapisan reservoir dengan nilai resistivitas 11-60 Ωm, yang diperkirakan berasal dari batuan produk Vulkanik Arjuno-Welirang berupa aliran piroklastik (Qapaw). Lapisan heat Source dengan nilai resistivitas 80-300 Ωm yang diperkirakan berasal dari kegiatan vulkanisme lava tua produk Gunung Arjuno-Welirang (Qlaw).
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The geothermal prospect of the Mount Arjuno and Mount Welirang regions has a potential reserve of 280 Mwe, but the energy potential has not yet been developed as a geothermal production field that generates electricity. The MT method is one of the passive geophysical methods used in geothermal exploration. This characteristic of passivity allows to measure all signals including those containing noise. The noise arises because of the complexity and inhomogeneity of the Earth, this causes the measured impedance tensor not to be perpendicular to the direction of strike. The solution to this problem is to rotate the structure before the 2D inversion process, it is done to fulfill the 2D inversion assumption that the structure is elongated. In this study, the impedance tensor rotation will be based on geo-electrical strike before data modeling. The results of this study are that the geo-electrical strike angle value obtained by analysis of tipper strike data is 500, so that the impedance tensor rotation is 500. The arjuno-Welirang geothermal system is in the Lower Quaternary Volcano Formation (Qp) and Arjuna – Welirang (Qvaw) volcano which consists of a cap rock layer with a resistivity value of 5-10 Ωm, the cap rock in the Arjuna – Welirang Volcano Formation is estimated that originate from a lava welirang (Qlw) product which has undergone an alteration process, while the cap rock in the Lower Quaternary Formation it is estimated that originate from the massive Lava product of Welirang (Qlaw) which has not been strongly deformation. The reservoir layer has a resistivity value of 11-60 Ωm, which which is estimated that originate from Arjuno-Welirang volcanic rock products in the form of pyroclastic flow (Qapaw). Heat Source layer with a resistivity value of 80-300 Ωm which is estimated to originate from the activities of old lava volcanism products of Mount Arjuno-Welirang (Qlaw).
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSGf 538.3 Can p-1 2019 |
| Uncontrolled Keywords: | Geo-electrical strike, Metode magnetotelurik, Pemodelan inversi 2D, Rotasi tensor impedansi |
| Subjects: | Q Science > QC Physics > QC20.7.F67 Fourier transformations Q Science > QC Physics > QC446.3.H37 Harmonics (Electric waves) Q Science > QE Geology |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Catur Rizkillah Cancerio |
| Date Deposited: | 02 May 2024 03:18 |
| Last Modified: | 02 May 2024 03:18 |
| URI: | http://repository.its.ac.id/id/eprint/64431 |
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