ANALYSIS OF THE SUBSURFACE STRUCTURE OF THE GEOTHERMAL POTENTIAL AREA BASED ON MAGNETIC DATA (CASE STUDY IN BLUE MOUNTAIN-NORTH NEVADA)
Energy is an absolute necessity that is needed in human life and its availability has a major influence on the progress of development. Renewable energy sources that exist all the time and are widely available in Indonesia, one of which is geothermal. The magnetic method is one of the advanced ex...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71628 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Energy is an absolute necessity that is needed in human life and its availability has
a major influence on the progress of development. Renewable energy sources that
exist all the time and are widely available in Indonesia, one of which is geothermal.
The magnetic method is one of the advanced exploration techniques in geothermal
observations. Magnetic methods are used to determine the magnetic properties of
rocks and subsurface geological structures based on magnetic field anomalies.
Knowing the subsurface geological structure will be very helpful in interpreting the
basic structure and faults that may be used as a path for geothermal fluids to
escape. In this study, an analysis of the magnetization of the earth's surface was
carried out to determine the composition of rocks below the earth's surface from
the acquisition of magnetic susceptibility values. Geothermal causes the value of
the magnetic anomaly to be low because there is a demagnetization process that
removes the magnetic properties of the rock. Mag2dc software is used to determine
the subsurface structure of the earth in 2 dimensions, and Rockwork software. The
Mag2dc device uses a trial and error method in modeling the magnetic
susceptibility of rocks. If the susceptibility is negative, then there is a magnetic
anomaly which indicates there is a potential for a geothermal reservoir. The initial
step of modeling is the selection of areas that have moderate to low magnetic
anomalies. In modeling, a negative magnetic susceptibility value is obtained at a
depth close to the earth's core. This area indicates the presence of geothermal
sources. In modeling, sedimentary rock types are obtained (sandstone), granite
rocks (granite, diorite, and gabbro), and basalt volcanic rocks |
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