INVESTIGATION OF MAGNETIC ANOMALIES IN CAFERBEYLI GEOTHERMAL AREA (MANISA/TÜRKIYE) USING 3-D INVERSION AND RADIAL AMPLITUDE POWER SPECTRUM METHODS


Timur E.

MIDDLE EAST INTERNATIONAL CONFERENCE ON CONTEMPORARY SCIENTIFIC STUDIES-VIII, Adana, Turkey, 7 - 08 January 2023, pp.101-107

  • Publication Type: Conference Paper / Full Text
  • City: Adana
  • Country: Turkey
  • Page Numbers: pp.101-107
  • Dokuz Eylül University Affiliated: Yes

Abstract

The demand for geothermal energy is increasing due to its clean, sustainable use as a renewable resource. Geothermal energy may be used in many ways, such as in hot springs and spas, geothermal power plants, fishing and farming industry, and heating individual buildings and as well as the entire district. Geothermal energy is the accumulation of heat energy as hot water within hot and dry rocks, steam or gases under pressure within the earth's crust at various depths. The change in physical properties of rock with temperature may be determined using electrical, electromagnetic, gravity, magnetic, seismic, radiometric, well-logging and down hole geophysical methods. The Caferbeyli geothermal system is situated within the confines of the county of Manisa about 100 km east of İzmir. Increasing demand on thermal water requires exploring new fields. For this purpose, geophysical studies may assist in quantifying the geothermal energy potential of the area by delineating subsurface fractures. The major purpose of this magnetic survey is to locate the boudaries of active hydrothermal system in the South of Gediz Graben in Caferbeyli. The presence of the hydrothermal system had already been inferred from surface evidence of hydrothermal activity and drillings. Firstly, 3-D prismatic models were theoretically investigated and edge detection methods were utilized to define the boundaries and the parameters of the structure. In the first step of the application, it was necessary to convert the total field anomaly into a reduced-to-pole anomaly map. Then the geometric boudaries of the structures were determined by applying a MATLAB based software with 3 different edge detection algorithms, such as tilt angle, theta map and analytic signal methods. The exact location of the structures were obtained by using these boundary coordinates as initial geometric parameters in the inversion process. In addition to these methods, reduction to pole and horizontal gradient methods were applied to the data to achieve more information about the location and shape of the possible reservoir. As a result, the edge detection methods were found to be successful, both in the field and as theoretical data sets for delineating the boundaries of the possible geothermal reservoir structure. The depth of the geothermal reservoir was determined as 2,4 km from 3-D inversion and 2,32 km from radial amplitude power spectrum methods.