MAGNETIC BASEMENT MODELLING USING MAGB_INV PROGRAM IN TALU-TOMBANG GEOTHERMAL REGION, WEST SUMATRA
Subsurface structure modeling is crucial for hydrocarbon and mineral exploration activities. The presence of hydrocarbons, minerals and geothermal resources are usually found in sedimentary basins, but there are not many programs that can be used to estimate the depth and presence of sedimentary...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/63712 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Subsurface structure modeling is crucial for hydrocarbon and mineral exploration
activities. The presence of hydrocarbons, minerals and geothermal resources are
usually found in sedimentary basins, but there are not many programs that can be
used to estimate the depth and presence of sedimentary basins. The alternative is to
identify the magnetic basement. Magnetic methods can be used to determine
magnetic bedrock or magnetic basemnt. Basement modeling can be used for
geothermal exploration which is being intensively developed in the energy industry.
There have been many studies on geothermal manifestations, but not many have
investigated the magnetic basement, especially in Indonesia. In this study, modeling
with an anomaly inversion process in the Talu – Tombang geothermal area, West
Pasaman district, West Sumatra province will be carried out using a MATLABbased program called MagB_Inv. The MagB_Inv program has been proven to be
able to perform computations quickly with high precision, is able to process largescale data and can determine the three-dimensional structure of the magnetic
basement. This program utilizes the Fourier transform to generate the topography
of the basement surface. The data is presented with two-dimensional and threedimensional modeling of the results of a rapid iterative procedure on magnetic
anomaly data, initial input parameters, frequency, and convergence criteria to
produce a magnetic basement depth model. The result of the modeling is a
decreased magnetic basement relief on the East side of the research region with the
depth of 2 km from the earth's surface. The rock group that is thought to make up
the magnetic basement is a group of Pre-Tertiary rocks, namely Metamorphic rocks
composed of Quartzite and Gneiss rocks. |
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