Integrated geophysical investigations in the Hisar geothermal field, Demirci, western Turkey

Ozurlan G., Sahin M.

GEOTHERMICS, vol.35, no.2, pp.110-122, 2006 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1016/j.geothermics.2005.11.004
  • Title of Journal : GEOTHERMICS
  • Page Numbers: pp.110-122


The shallow, low-temperature geothermal field of Hisar, in western Turkey, was studied by means of vertical electrical sounding (VES), Wenner, self-potential (SP) and very low-frequency electromagnetic (VLF-EM) profiling surveys. The VES survey, conducted along the valley in an E-W direction, provided lithological and structural information that is in good agreement with the well data, and suggests that the field is characterized by low-resistivity values (<= 30 Omega m). Because the resistivity structure in a N-S direction could not be investigated due to the rough topography towards the north, SP, Wenner and VLF-EM measurements were made to identify and characterize a possible hot-fluid carrying fault/fracture zone that forms one of the boundaries of the valley. There is a good correlation between the results of the SP, VLF-EM and Wenner surveys, which confirm the existence of the NE-SW striking fault zone that had been inferred from geologic information. Tensional fractures that developed perpendicular to the fault zone were also identified.