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High-temperature measurements in well WD-1A and the thermal structure of the kakkonda geothermal system, Japan

✍ Scribed by Ken Ikeuchi; Nobuo Doi; Yukihiro Sakagawa; Hiroyuki Kamenosono; Toshihiro Uchida

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
883 KB
Volume
27
Category
Article
ISSN
0375-6505

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✦ Synopsis

The New Energy and Industrial Technology Development Organ! ization "NEDO# drilled well WD!0a between 0883 and 0884 in the Kakkonda geothermal _eld as part of their {{Deep Seated Geothermal Resources Survey|| project[ High!temperature measurements were carried out in WD!0a[ Logging temperatures above 303>C were con_rmed at 2599 m and 2589 m depth after 71 h standing time[ Simple Horner extrapolations based on observed temperatures up to 71 h after shut!in suggested a temperature of about 499>C at 2499 m depth[ Temperatures between 499>C and 409>C were also con_rmed at 2619 m depth after 018Ð048 h standing time\ using calibrated melting tablets[ These are the highest temperatures measured in a geothermal well[ These results suggest a thermal structure consisting of three layers[ Layer one is a shallow permeable zone of the reservoir\ at less than 0499 m depth\ at 129>C to 159>C[ The second layer is a deep zone of the reservoir\ which is less permeable and has a tem! perature of 249>C to 259>C from 0499 m to about 2099 m depth[ The third layer is a zone of heat conduction[ The transition between the hydrothermal! convection zone and the deeper heat!conduction zone is at 2099 m depth in well WD!0a[ Þ 0887 CNR[ Published by Elsevier Science Ltd[ All ri`hts reserved Key words] logging\ temperature measurement\ thermal structure\ deep geo! thermal well\ Kakkonda\ Japan[

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