Temperature. Pressure and kh Distribution in the Kirishima Geothermal Field

Abstract

Since 1979, active dri I lings and research have been conducted to define the geothermal resources in the Kirishima geothermal field, Geophysical logs and well tests were carTied out in all the wells, Pressure interference tests were introduced in the Ginyu area where a superior permeable reservoir exist. According to the resu I ts of these tests, temperature, pressure and permeabi lity-thickness product (khl distribution in the Kirishima geothermal field became clear. Two ENE-WSW trending permeable zones were detected in the Ginyu and the Shiramizugoe areas. The two permeable zones were estimated to be separate because of the difference in reservoir pressure, The highest temperature area I ies in the southeastern part of the area. II constant temperature area of 232C extends widely in the Ginyu area. Those reservoir characteristics are interrelated each other, and also related with the geological features of the field.