ONE DIMENSIONAL CONTROLLED-SOURCE AUDIO-FREQUENCY MAGNETOTELLURICS (CSAMT) DATA INVERSION MODELING USING OCCAM METHODS
The Controlled-Source Audio-Frequency Magnetotellurics method is an active geophysical method that utilizes the physical properties of EM waves to measure rock resistivity values beneath the surface. Generally, CSAMT is used for geothermal, mining, or oil and gas exploration. In its use, CSAMT da...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/65778 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Controlled-Source Audio-Frequency Magnetotellurics method is an active
geophysical method that utilizes the physical properties of EM waves to measure
rock resistivity values beneath the surface. Generally, CSAMT is used for
geothermal, mining, or oil and gas exploration. In its use, CSAMT data needs to be
further processed with forward modeling or inversion modeling in order to be able
to image the actual subsurface conditions. This research was conducted to test the
accuracy of the development of the Levenberg-Marquardt inversion method into a
simple Occam method in performing the inversion process of CSAMT data. This
inversion modeling applies the basic properties of the Occam inversion method by
looking for a smooth model that can be described in detail the original conditions
of the subsurface profile. In this study, the modeling version tested on synthetic data
refers to 4 types of sounding curve conditions, namely types A, H, K, and Q. The
synthetic data used in this research has accommodated the actual conditions of the
field data with the addition of a 5% noise parameter. on the impedance value
generated from the forward modeling. The results of the inversion modeling test
using the Occam approach are considered good, achieving optimal results with an
ERMS value of less than 5%. |
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