Pemodelan Inversi 3D Struktur Bawah Permukaan Area Panas Bumi Cisolok, Jawa Barat Berdasarkan Data Gayaberat

Nuriyah, Syafiatun (2021) Pemodelan Inversi 3D Struktur Bawah Permukaan Area Panas Bumi Cisolok, Jawa Barat Berdasarkan Data Gayaberat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu area yang memiliki potensi panas bumi di Provinsi Jawa Barat yakni Cisolok. Didukung dengan ditemukannya beberapa manifestasi berupa mata air panas dan sesar dapat memperkuat pendugaan adanya potensi di area tersebut. Cakupan pengukuran metode gaya berat sebesar 70 km2 dengan 116 data pengukuran. Tujuan dari penelitian ini untuk menganalisis struktur bawah permukaan berdasarkan pemodelan inversi 3D dan 2D dari data anomali residual. Proses pengerjaan yang dilakukan meliputi reduksi data gaya berat untuk mendapatkan anomali bouguer lengkap, dilanjutkan dengan proses gridding dan filtering untuk mendapatkan anomali residual, setelah itu dilakukan proses inversi 3D dengan menggunakan inversi Singular Value Decomposition (SVD) dan inversi Occam untuk mendapatkan model densitas 3D yang akhirnya dilakukan interpretasi dan analisis lebih lanjut. Didapatkan peta anomali residual dengan jenis anomali tinggi bernilai antara 5,2 mGal hingga 36,2 mGal diinterpretasikan sebagai lava andesit dan lava basalt. Anomali sedang bernilai -9,8 mGal hingga 5,2 mGal diinterpretasikan sebagai susunan batuan vulkanik lapuk. Anomali rendah memiliki nilai -45,2 mGal hingga -9,8 mGal diinterpretasikan sebagai batuan terubahkan akibat panas dan keberadaan struktur sesar. Berdasarkan hasil sayatan 2D nilai densitas rendah 1,4-1,7 gr/cm3 diinterpretasikan batuan yang berasosisasi dengan zona sesar untuk mengontrol manifestasi permukaan. Pada densitas sedang 1,7-2,4 gr/cm3 diinterpretasikan sebagai batuan breksi vulkanik. Sedangkan densitas tinggi 2,4-2,8 gr/cm3 diinterpretasikan sebagai intrusi andesit.
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One area that has geothermal potential in West Java Province is Cisolok. Supported by the discovery of several manifestations in the form of hot springs and faults, that can strengthen the estimation of potential in the area. The measurement coverage of the gravity method is 70 km2 with 116 measurement data. The purpose of this study is to analyze the subsurface structure based on 3D and 2D inversion modeling of residual anomaly data. The processing carried out includes reducing the gravity data to obtain a complete bouguer anomaly, followed by a gridding and filtering process to obtain residual anomaly, after which a 3D inversion process is carried out using Singular Value Decomposition (SVD) inversion and Occam inversion to obtain a 3D density model that finally, further interpretation and analysis were carried out. A residual anomaly map with high anomaly types was obtained with values between 5.2 mGal to 36.2 mGal is interpreted as andesitic lava and basalt lava. The moderate anomaly of -9.8 mGal to 5.2 mGal is interpreted as a weathered volcanic rock composition. The low anomaly has a value of -45.2 mGal to -9.8 mGal is interpreted as an altered rock due to heat and the presence of fault structures. Based on the results of the 2D incision, the low-density value of 1.4-1.7 gr/cm3 is interpreted as rock associated with the fault zone to control the surface manifestations. At medium density 1.7-2.4 gr/cm3 is interpreted as volcanic breccia rocks. While the high-density of 2.4-2.8 g/cm3 is interpreted as andesite intrusion.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Anomali residual, densitas, inversi, panas bumi, struktur Residual anomaly, density, inversion, geothermal, structure
Subjects:	Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Syafiatun Nuriyah
Date Deposited:	27 Aug 2021 02:40
Last Modified:	27 Aug 2021 02:40
URI:	http://repository.its.ac.id/id/eprint/89868

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