Identifikasi Persebaran Litologi Bawah Permukaan Menggunakan Metode Geolistrik 2D Resistivitas Dengan Konfigurasi Wenner-Schlumberger dan Data Bor pada Daerah “Cikondang"

Sutedjo, Tantyo Trimulya (2024) Identifikasi Persebaran Litologi Bawah Permukaan Menggunakan Metode Geolistrik 2D Resistivitas Dengan Konfigurasi Wenner-Schlumberger dan Data Bor pada Daerah “Cikondang". Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Daerah Cikondang merupakan wilayah yang memiliki stratigrafi dengan mayoritas litologinya berasal dari material vulkanisme dan tersebar serta terendapkan di sekitar daerah penelitian. Secara umum sebaran litologi mengacu pada distribusi dan karakterisitik geologis dari berbagai jenis batuan dan material di bawah permukaan. Oleh karena itu, dilakukan penelitian ini yang bertujuan untuk mengidentifikasi susunan dan sebaran litologi bawah permukaan menggunakan metode geolistrik 2D resistivitas dengan konfigurasi Wenner-Schlumberger dan data pemboran pada daerah “Cikondang”. Metode Geolistrik 2D akan menghasilkan model penampang 2D berdasarkan variasi nilai resistivitas, sedangkan dari data pemboran dapat dilakukan analisis litologi. Data hasil pengukuran Geolistrik 2D konfigurasi Wenner-Schlumberger sebanyak 5 lintasan dan terdapat juga 3 titik pemboran di sekitar area lintasan geolistrik sebagai data korelasi. Dari hasil analisis korelasi data geolistrik 2D dan data bor, lapisan andesitic tuff terindikasi nilai resistivitas rendah dan lapisan breksi vulkanik terindikasi nilai resistivitas menengah hingga tinggi. Persebaran lapisan andesitic tuff terdapat di bawah lapisan penutup (top soil) yang cenderung merata di setiap lintasan pada kedalaman lebih dangkal sekitar 20 m di bawah permukaan hingga kedalaman yang lebih dalam terdapat sekitar 130 m dibawah permukaan. Sedangkan, persebaran lapisan breksi vulkanik berada di bagian bawah lapisan andesitic tuff pada kedalaman lebih dangkal 20 m dibawah permukaan hingga kedalaman yang lebih dalam sekitar 150 m. Dilakukan pemodelan 3D untuk mengetahui penyebaran litologi secara vertikal dan horizontal melalui model sayatan penampang 2D geolistrik. Model 3D menunjukkan sebaran lapisan andesitic tuff dan breksi vulkanik yang cukup merata di area penelitian dengan ketebalan yang bervariasi. Integrasi antara metode geolistrik 2D dan data log bor serta pemodelan inversi 3D resistivitas memberikan gambaran visual yang komprehensif mengenai struktur lapisan bawah permukaan sekaligus penyebaran litologi secara lateral dan vertikal, sehingga berguna dalam mengetahui kondisi litologi bawah permukaan daerah penelitian.
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The Cikondang area is an area that has a stratigraphy with the majority of its lithology derived from volcanic material and is scattered and deposited around the study area. In general, lithology distribution refers to the distribution and geological characteristics of various types of rocks and materials in the subsurface. Therefore, this research aims to identify the composition and distribution of subsurface lithology using 2D resistivity geoelectric method with Wenner-Schlumberger configuration and drilling data in the "Cikondang" area. The 2D Geoelectric method will produce a 2D cross-sectional model based on variations in resistivity values, while drilling data can be analyzed for lithology. The data from the 2D Geoelectric measurement of the Wenner-Schlumberger configuration are 5 passes and there are also 3 drilling points around the geoelectric track area as correlation data. From the results of the correlation analysis of 2D geoelectric data and drilling data, the andesitic tuff layer indicated low resistivity values and the volcanic breccia layer indicated medium to high resistivity values. The distribution of the andesitic tuff layer is under the top soil layer which tends to be evenly distributed in each track at a shallower depth of about 20 m below the surface to a deeper depth of about 130 m below the surface. Meanwhile, the distribution of the volcanic breccia layer is at the bottom of the andesitic tuff layer at a shallower depth of 20 m below the surface to a deeper depth of about 150 m. 3D modeling was carried out to determine the vertical and horizontal distribution of lithology through a 2D geoelectric cross section model. 3D modeling was carried out to determine the vertical and horizontal distribution of lithology through the 2D geoelectric cross section model. The 3D model shows a fairly even distribution of andesitic tuff and volcanic breccia layers in the study area with varying thickness. The integration of 2D geoelectric method and drill log data as well as 3D resistivity inversion modeling provides a comprehensive visual picture of the subsurface layer structure as well as the lateral and vertical distribution of lithology, making it useful in knowing the subsurface lithological conditions of the study area.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	andesitic tuff, breksi vulkanik, ilitologi, resistivitas, andesitic tuff, resistivity, lithological, volcanic breccia
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:	Tantyo Trimulya Sutedjo
Date Deposited:	12 Aug 2024 03:11
Last Modified:	12 Aug 2024 03:11
URI:	http://repository.its.ac.id/id/eprint/114641

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