Identifikasi Sistem Panas Bumi Lapangan "SK" Berdasarkan Nilai Resistivitas Hasil Pemodelan Inversi 1D dan 2D Data Magnetotelurik

Jasman, Andre Maries (2018) Identifikasi Sistem Panas Bumi Lapangan "SK" Berdasarkan Nilai Resistivitas Hasil Pemodelan Inversi 1D dan 2D Data Magnetotelurik. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lapangan panas bumi “SK” berada pada zona vulkanik yang didominasi oleh lava andesit-basaltik dan jatuhan piroklastik. Daerah ini memiliki potensi panas bumi ditandai dengan kemunculan manifestasi panas bumi berupa steam ground, air panas, dan fumarol. Pengolahan data magnetotelurik lapangan panas bumi “SK” dilakukan dengan tahapan sebagai berikut: FFT, robust processing, cross power correction, static shift correction, inversi 1D Occam, cross section modelling, inversi 2D NLCG, dan pendekatan model 2D dengan 1D untuk menghilangkan efek galvanik pada lapisan dangkal. Hasil pemodelan diintegrasikan dengan data geologi untuk diinterpretasi. Sistem panas bumi lapangan “SK” berada pada wilayah formasi Lava “B3”yang terdiri dari lapisan cap rock dengan nilai resistivitas 5-20 Ωm pada kedalaman 1000-2000 meter, lapisan reservoir dengan nilai resistivitas 150-350 Ωm di kedalaman 2000-2500 meter dan terdapat kelurusan sesar di wilayah di wilayah titik MTKM-19 dan MTKM-26 yang terlihat pada kontras resistivitas berdasarkan hasil pemodelan.===============================================The "SK" geothermal field is in a volcanic zone dominated by andesite-basaltic lava and pyroclastic fall. This area has geothermal potential characterized by the appearence of geothermal manifestations of steam ground, hot water, and fumaroles. Geothermal magnetotelluric data processing "SK" is done with the following stages: FFT, robust processing, cross power correction, static shift correction, 1D Occam inversion, cross section modelling, 2D inversion NLCG, and 2D model approach with 1D to eliminate effects galvanic in shallow layers. The final modeling results are integrated with geological data to be interpreted. The "SK" field geothermal system is in the "B3" Lava Formation region consist of a cap rock layer with a resistivity value of 5-20 Ωm at a depth of 1000-2000 meters, a reservoir layer with a resistivity value of 150-350 Ωm at depths from 2000 to 2500 meters and there is a fault in MTKM-19 and MTKM-26 areas seen in contrast resistivity based on the modeling results.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Galvanic, Magnetoteluric, NLCG, Occam, Resistivity.
Subjects: Q Science > QE Geology
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Andre Maries Jasman
Date Deposited: 09 Jul 2021 09:15
Last Modified: 09 Jul 2021 09:15
URI: https://repository.its.ac.id/id/eprint/56852

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