Abstract
The Dikili geothermal area, in the northern part of Izmir province, is one of the best known geothermal areas in Western Anatolia. This study attempts to analyze and interpret Bouguer gravity data to determine average structural depth values and assess geothermal resources using the Radial Amplitude Spectrum Method (RASM), based on 2D Fast Fourier Transform (FFT) analysis. We selected four different areas to apply the method. The greatest advantage of this method over the conventional power spectrum method is that it can determine the mean depth from 2D FFT spectra, not using a single cross-section taken in one direction. Thus, the user can select an area rather than a direction and average depth can be determined more accurately. The results show that average depth values of the top of the reservoir vary between 314 and 640 m in the region.
Highlights
Geothermal energy is environmentally friendly, costeffective, sustainable and reliable, but has historically been limited to areas near tectonic plate boundaries
Geothermal systems can be described as a combination of units in which water is used as a transport agent, through which the heat is taken from the sources in the ground and transmitted to the consumer
Various data processing and modeling methods such as edge detection and 3-D inversion were previously applied to data obtained from digitization with 0.05 km grid spacing of the Bouguer gravity anomaly map [6, 27] of the geothermal area at Dikili (Fig. 3) [41, 42]
Summary
Geothermal energy is environmentally friendly, costeffective, sustainable and reliable, but has historically been limited to areas near tectonic plate boundaries. Geothermal water production releases greenhouse gases trapped deep within the Earth These emissions are much lower per unit of energy production than those of fossil fuels. High arsenic contents pose an environmental problem, and the Structural features of geothermal systems are different from oil and gas systems where the fluids are stored in the pores of permeable formations and confined by impermeable rock. They are different from groundwater systems, which can be either confined, unconfined or in perched aquifers. The main objective of geophysical studies in geothermal exploration is to determine and model the physio-chemical properties of the geothermal system and its elements, the reservoir
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