Proceedings of the 6th New Zealand Geothermal Workshop 1985. Fluid inclusion study in the Takinoue geothermal field, Iwate Prefecture, Japan : an application to the estimate of the present underground temperature. New Zealand Geothermal Workshop [7-9 Nov. 1984, New Zealand].

Muramatsu, Yoichi.

[1984]

CIENA
171

0-86869-056-2

Study has made to measure filling temperature and salinities of fluid inclusions in the cuttings of wells in the Takinoue geothermal field, Iwate Prefecture, Japan, by means of the heating and freezing stage microscope. Fluid inclusions are composed mainly of two-phase high density liquid inclusions. In almost wells, the minimum filling temperature has a tendency to increase abruptly from near the surface to about 400 m deep, and to be about constant from 212 to 236.C at the deeper parts. The minimum filling temperatures are in good agreement with the measured borehole temperatures. The salinities of fluid in primary and secondary inclusions are ranging from 0.1 to 1.5 wt. percent and 0.05 to 0.7 wt. percent NaC1 equivalent, respectively. The major results obtained are as follows: (1) The cap rock is existing at the northwestern part of the field, (2) At least about 900 m of overburden was possible eroded after minaralization had taken place, (3) The last trapping fluid is probably the present deep geothermal fluid.

Presenta diagrs., gráfs. y maps.

NUEVA ZELANDIA; ENERGIA GEOTERMICA; CAMPOS GEOTERMICOS; FLUIDOS GEOTERMICOS; TEMPERATURA; POZOS GEOTERMICOS; ANALISIS DE CONTENIDO; RECURSOS GEOTERMICOS;