INTERPRETATION OF GRAVITY METHOD IN IDENTIFYING GEOTHERMAL POTENTIAL IN KADIDIA, SIGI DISTRICT, CENTER SULAWESI
The target for the use of new and renewable energy in Indonesia in 2025 is 23% and 31% in 2050. However, based on data from EBTKE-ESDM in 2020, the use of new and renewable energy is 10.9%. However, the target of 31% by 2050 is very large to achieve and geothermal is one of the alternative energy...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/66903 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The target for the use of new and renewable energy in Indonesia in 2025 is 23%
and 31% in 2050. However, based on data from EBTKE-ESDM in 2020, the use of
new and renewable energy is 10.9%. However, the target of 31% by 2050 is very
large to achieve and geothermal is one of the alternative energy sources that has
the potential to achieve this target. The Kadidia area, Sigi Regency, Central
Sulawesi is the object of study in this research, based on data from the geological
agency in 2012, it is predicted that there will be geothermal reserves of around 66
MWe. This study aims to model the geothermal system in the Kadidia area using
the gravity method. The gravity method is used because it is able to identify the
structure of the subsurface image by utilizing variations in the gravitational field
to determine geothermal potential based on variations in rock density. The Bouguer
anomaly map obtained illustrates the dominant structural pattern with a northwestsoutheast trend which is thought to be the controller of the emergence of hot springs
in the Kadidia area. Furthermore, anomaly separation is carried out using the
Gaussian method and Filter Assisted BEMD to generate regional and residual
anomalies. The results of the Gaussian filtering method, namely the residual
anomaly, show the distribution of the anomaly values that are considered to be in
accordance with the geological information so that they are used as input in
carrying out 2,5D forward modeling. The main components of the geothermal
system in the Kadidia area obtained are: apart from heat from magma, plutonic
granite rocks which are also estimated to be a heat source, volcanic rocks which
are predicted to be reservoirs, while those suspected to be caprock are sedimentary
layers in the form of lake deposits which are considered to have porosity and
permeability. The low one. |
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