Homogenization Temperatures of Fluid Inclusions Versus Borehole Temperatures

Abstract

The Takigali area is located in the north-eastern part of the Hohi geothermal field which is one of the lost active geotherlal field in Japan. Many hot springs and alteration halos are distributed in the Hohi geotherlal field. but the Takigali area is characterized by no surface geotherlal lanifestation. Since 1974. more than 20 exploration wells have been drilled in this area. The highest leasured te.perature in these wells was 252C. Orill core and cutting salPles in these wells were studied by X-ray diffraction to clarify the nature of hydrothe.al alteration. The purpose of this report is to describe the distribution of alteration linerals and to discuss the geotherMal structure related to alteration zoning.