Estimasi Volume Batuan Andesit Menggunakan Metode Geolistrik Konfigurasi Wenner-Schlumberger pada Lapangan “ADC”, Bogor.

Chantilka, Asyuniva Dwi (2026) Estimasi Volume Batuan Andesit Menggunakan Metode Geolistrik Konfigurasi Wenner-Schlumberger pada Lapangan “ADC”, Bogor. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5017221075-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (2MB) | Request a copy

Abstract

Lapangan "ADC" yang terletak di Bogor merupakan wilayah dengan potensi sumber daya batuan andesit yang cukup besar, didukung oleh keberadaan Formasi Bojongmanik (Tmb), Formasi Batuan Gunungapi Muda (Qv), dan Formasi Andesit Gunung Sudamanik (Qvas). Seiring meningkatnya kebutuhan infrastruktur, diperlukan informasi yang lebih rinci mengenai persebaran dan estimasi volume batuan andesit di bawah permukaan. Penelitian ini bertujuan untuk mengidentifikasi persebaran batuan andesit, mengetahui karakteristiknya, serta mengestimasi volumenya berdasarkan pemodelan tiga dimensi (3D). Metode yang digunakan adalah geolistrik resistivitas dengan konfigurasi Wenner–Schlumberger menggunakan 12 lintasan sejajar, masing-masing sepanjang 470 m dengan spasi elektroda 10 m pada area seluas 100 ha. Data geolistrik diolah menggunakan perangkat lunak Res2DInv untuk menghasilkan penampang 2D, kemudian dilanjutkan dengan pemodelan 3D menggunakan Leapfrog. Validasi dilakukan menggunakan data bor pada empat titik yang tersebar di area penelitian. Hasil pengolahan data geolistrik menunjukkan rentang nilai resistivitas sebesar 1,22 hingga >51,0 Ωm dengan *Root Mean Square* (RMS) error berkisar antara 10% hingga 20%. Berdasarkan hasil pengeboran, litologi daerah penelitian diklasifikasikan menjadi empat satuan, yaitu *soil* (batuan penutup) atau batu lanau (<19,0 Ωm), batu pasir (19,0–37,0 Ωm), batuan andesit dengan tingkat pelapukan tinggi hingga sempurna (37,0–51,0 Ωm), serta batuan andesit dengan tingkat pelapukan menengah hingga rendah (>51,0 Ωm). Penampang geolistrik 2D menunjukkan bahwa area penelitian didominasi oleh batuan andesit dengan tingkat pelapukan tinggi hingga sempurna serta menengah hingga rendah. Interpretasi tersebut dikonfirmasi oleh data bor yang menunjukkan bahwa batuan andesit pada seluruh titik pengeboran telah mengalami tingkat pelapukan dari rendah hingga sempurna. Hasil pemodelan geolistrik 3D mengestimasi volume hipotetik batuan andesit dengan pelapukan tinggi hingga sempurna sebesar 4.825.000 m³, sedangkan batuan andesit dengan pelapukan menengah hingga rendah diperkirakan memiliki volume hipotetik sebesar 149.780.000 m³. Berdasarkan SNI 4726:2019, sumber daya hasil penelitian ini termasuk dalam klasifikasi sumber daya tereka.
=====================================================================================================================================
The "ADC" field, located in Bogor, has significant andesite rock resource potential, supported by the presence of the Bojongmanik Formation (Tmb), Young Volcanic Rock Formation (Qv), and Mount Sudamanik Andesite Formation (Qvas). With the increasing demand for infrastructure development, more detailed information regarding the subsurface distribution and estimated volume of andesite is required. This study aims to identify the distribution of andesite, characterize its weathering conditions, and estimate its volume through three-dimensional (3D) modeling. The research employed the electrical resistivity method using the Wenner–Schlumberger array. A total of 12 parallel survey lines, each 470 m in length with a 10 m electrode spacing, were conducted over an area of approximately 100 ha. The resistivity data were processed using Res2DInv software to generate 2D resistivity sections, followed by 3D geological modeling using Leapfrog. The interpretation was validated using borehole data from four drilling locations distributed across the study area. The resistivity inversion results showed values ranging from 1.22 to >51.0 Ωm, with *Root Mean Square* (RMS) errors between 10% and 20%. Based on borehole validation, the subsurface lithology was classified into four units: soil (overburden) or siltstone (<19.0 Ωm), sandstone (19.0–37.0 Ωm), highly to completely weathered andesite (37.0–51.0 Ωm), and moderately to slightly weathered andesite (>51.0 Ωm). The 2D resistivity sections indicate that the study area is predominantly composed of highly to completely weathered andesite and moderately to slightly weathered andesite. These interpretations are consistent with borehole data, which confirm that the andesite exhibits weathering grades ranging from slight to complete across all drilling locations. The 3D resistivity model estimates a hypothetical volume of approximately 4,825,000 m³ for highly to completely weathered andesite and 149,780,000 m³ for moderately to slightly weathered andesite. According to SNI 4726:2019, these estimated resources are classified as *Inferred Mineral Resources*.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Batuan Andesit, Geolistrik Resistivitas, Wenner-Schlumberger, Estimasi Volume, Data Bor. Andesite, Electrical Resistivity, Wenner-Schlumberger, Volume Estimation, Borehole Data.
Subjects:	Q Science > QE Geology T Technology > TN Mining engineering. Metallurgy > TN269 Prospecting--Geophysical methods
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Asyuniva Dwi Chantika
Date Deposited:	22 Jul 2026 07:20
Last Modified:	22 Jul 2026 07:20
URI:	http://repository.its.ac.id/id/eprint/136254

Actions (login required)

View Item