Penerapan Foward Modeling 2D pada Survey Geolistrik Tahanan Jenis Studi Kasus Model Anomali Batuan Intrusive, Cavity dan Thin Bed

Pratama, Yudi Rahmat (2019) Penerapan Foward Modeling 2D pada Survey Geolistrik Tahanan Jenis Studi Kasus Model Anomali Batuan Intrusive, Cavity dan Thin Bed. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Konfigurasi elektroda memiliki kelebihan dan kelemahan dalam pengukuran parameter model bawah permukaan. Masing-masing konfigurasi elektroda dapat memberikan respon data yang berbeda pada benda anomali yang sama. Oleh sebab itu, untuk menentukan konfigurasi elektroda dan parameter lapangan yang paling tepat dalam memetakan benda anomali berupa batuan intrusive, cavity dan thin bed dilakukan foward modeling. Proses foward modeling menggunakan software RES2DMOD dengan data keluaran berupa penampang 2D resistivitas semu. Selanjutnya dilakukan proses inversi modeling menggunakan software RES2DINV dengan metode inversi least square. Hasil akhir pemodelan berupa peta penampang 2D resistivitas yang akan dibandingkan berdasarkan %rms error. Dari hasil pemodelan yang telah dilakukan didapatkan konfigurasi Wenner paling baik dalam memetakan tubuh batuan intrusive sill dengan nilai rms error sebesar 22.3%. Konfigurasi Dipole-Dipole paling baik dalam memetakan tubuh batuan intrusive dyke dengan nilai rms error sebesar 13.28%. Jarak spasi elektroda optimal sebesar 3 meter dalam memetakan model anomali cavity dengan nilai rms error sebesar 11.52% dan jarak spasi elektroda optimal sebesar 0.1 meter dalam memetakan model anomali thin bed dengan nilai rms error sebesar 0.98%
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Application of electrode configurations in measuring subsurface have either advantages or disadvantages. Each electrode configuration might give different data responses to the same anomalous object. Therefore to determine what is the most appropriate electrode configuration and field parameters in mapping the anomalous objects in the form of intrusive, cavity and thin bed rocks, foward modeling was carried out in this study. The process of foward modeling uses RES2DMOD software which its output data is in the form of a 2D cross section of apparent resistivity. Then the modeling inversion process was carried out using RES2DINV software with the least square inversion method. The final result of the modeling is a 2D resistivity cross section map of each configuration and compared based on% rms error. From the modelling results obtained some following conclusion: the Wenner is the best configuration in describing intrusive sill rock bodies with% rms error of 22.3, the Dipole-Dipole is the best configuration in describing intrusive dyke rock bodies with a% rms error of 13.28, optimum electrode spacing is 3 meters in describing the cavity anomaly model with% rms error of 11.52 and optimum electrode spacing is 0.1 meters in describing the thin bed anomaly model with an% rms error of 0.98.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	: foward modeling, inverse modeling, electrode configurations, resistivity models
Subjects:	Q Science Q Science > QC Physics > QC610.3 Electric conductivity Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Yudi Rahmat Pratama
Date Deposited:	22 Jul 2026 08:56
Last Modified:	22 Jul 2026 08:57
URI:	http://repository.its.ac.id/id/eprint/64729

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