PENDUGAAN STRUKTUR SESAR DAN LAPISAN RESERVOIR DAERAH MANIFESTASI PANAS BUMI DANAU LINTING BERDASARKAN PEMODELAN 3D DATA GRAVITY

Nadia, Nadia (2025) PENDUGAAN STRUKTUR SESAR DAN LAPISAN RESERVOIR DAERAH MANIFESTASI PANAS BUMI DANAU LINTING BERDASARKAN PEMODELAN 3D DATA GRAVITY. S1 thesis, UNIVERSITAS JAMBI.

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Abstract

Kawasan Danau Linting merupakan danau vulkanik yang indah dan unik memiliki luas permukaan danau sekitar 5.512 m². Danau Linting merupakan danau yang berada di daerah aliran panas bumi. Berdasarkan Peta Geologi Lembar Medan diduga terdapat sesar-sesar minor yang melintasi daerah penelitian, yang menyebabkan manifestasi Panas Bumi Danau Linting muncul ke permukaan. Maka dari itu diperlukannya penelitian metode gravity sebagai survey awal untuk diketahui struktur bawah permukaan yang kemudian digunakan untuk mengetahui sebaran reservoir dan sumber panas di daerah manifestasi panas bumi Danau Linting berdasarkan pemodelan 3D data gravity. Data Gravitasi bumi didapatkan dari citra satelit GGMplus. Berdasarkan nilai anomali gravitasi dapat dilakukan analisis untuk menentukan keberadaan dan karakteristik jenis sesar yang berada di bawah permukaan yaitu analisis derivative. Berdasarkan peta complete bouger anomaly nilai anomaly berada pada rentang -21.4 mGal sampai -15.2 mGal. Adapun anomali tinggi lebih dominan pada wilayah penelitian yang tersusun oleh batuan dengan densitas yang tinggi seperti batuan beku, sedangkan anomali rendah disebabkan oleh batuan yang memiliki densitas rendah seperti batuan sedimen. Danau linting berada pada nilai anomali yang sedang. Hasil dari analisis derivative First Horizontal Derivative (FHD) dan Second Vertical Derivative (SVD) dari 4 slicing yang dibuat terdapat dugaan sesar yang berada di dekat Danau Linting. Sesar tersebut merupakan sesar lokal yang menjadi penyebab munculnya manifestasi ke permukaan. Hasil pemodelan 3 dimensi, lapisan bawah permukaan tersusun atas kerikil, pasir dan lempung, Tufa Riodasit, Piroklastika batuapung bersusunan andesit sampai dasit, batuan Andesit, batuan Dasit dan batuan Piroklastik. Batupasir dan Konglomerat. Adapun dugaan lapisan reservoir yang menjadi tempat terakumulasi fluida thermal ialah Batupasir dari Formasi Bruksah (Nob) yang terdapat pada kedalaman 1.3 km sampai dengan 2.2 km dibawah permukaan dan batuan Tufa Riodasit sebagai caprock yang berasal dari Formasi Tufa Toba (Qvt). The Linting Lake area is a beautiful and unique volcanic lake with a lake surface area of around 5,512 m². Linting Lake is a lake located in a geothermal flow area. Based on the Geological Map of the Medan Sheet, it is suspected that there are minor faults that cross the research area, which cause the Linting Lake Geothermal manifestation to appear on the surface. Therefore, a gravity method study is needed as an initial survey to determine the subsurface structure which is then used to determine the distribution of reservoirs and heat sources in the Linting Lake geothermal manifestation area based on 3D gravity data modeling. Earth's gravity data is obtained from GGMplus satellite imagery. Based on the gravity anomaly value, an analysis can be carried out to determine the presence and characteristics of the type of fault below the surface, namely derivative analysis. Based on the complete bouger anomaly map, the anomaly value is in the range of -21.4 mGal to -15.2 mGal. The high anomaly is more dominant in the research area which is composed of rocks with high density such as igneous rocks, while the low anomaly is caused by rocks with low density such as sedimentary rocks. Linting Lake is at a moderate anomaly value. The results of the First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) derivative analysis of the 4 slicings made, there is an alleged fault near Linting Lake. The fault is a local fault that causes the appearance of manifestations to the surface. The results of 3-dimensional modeling, the subsurface layer is composed of gravel, sand and clay, Rhyodacite Tuff, Pyroclastic pumice composed of andesite to dacite, Andesite rock, Dacite rock and Pyroclastic rock. Sandstone and Conglomerate. The suspected reservoir layer where thermal fluids accumulate is the Sandstone from the Bruksah Formation (Nob) which is found at a depth of 1.3 km to 2.2 km below the surface and the Rhyodasite Tufa rock as a caprock originating from the Toba Tufa Formation (Qvt). Keywords: Geothermal, Gravity, First Horizontal Derivative, Second Vertical Derivative, and 3 Dimensional Modeling.

Type: Thesis (S1)
Uncontrolled Keywords: Panas Bumi, Gravity, First Horizontal Derivative, Second Vertical Derivative, dan Pemodelan 3 Dimensi
Subjects: L Education > L Education (General)
Divisions: Fakultas Sains dan Teknologi > Teknik Geofisika
Depositing User: Nadia
Date Deposited: 14 Mar 2025 08:09
Last Modified: 14 Mar 2025 08:10
URI: https://repository.unja.ac.id/id/eprint/76399

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