High-temperature measurements in well WD-1A and the thermal structure of the Kakkonda geothermal system, Japan
High-temperature measurements in well WD-1A and the thermal structure of the Kakkonda geothermal system, Japan
复制标题
日本 WD-1A 井的高温测量和 Kakkonda 地热系统的热结构
DOI：
10.1016/s0375-6505(98)00035-2
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发表时间：
1998
期刊：
影响因子：
3.9
通讯作者：
T. Uchida
中科院分区：
文献类型：
--
作者：
K. Ikeuchi;N. Doi;Y. Sakagawa;Hiroyuki Kamenosono;T. Uchida
新能源和工业技术开发组织（NEDO）于1994年至1995年在Kakkonda地热田钻探了WD-1a井，作为其深层地热资源调查项目的一部分。在WD-1a中进行了高温测量。在3600 m和3690 m深度，静置82 h后，确认测井温度高于414°C。根据关井后82小时内观察到的温度，简单的Horner推断，3500 m深处的温度约为500°C。在3720 m深处，使用校准的熔融片，静置129-159 h后，也证实了温度在500°C和510°C之间。这是在地热井中测量到的最高温度。这些结果表明由三层组成的热结构。第一层是储层的浅渗透带，深度小于1500 m，温度为230°C至260°C。第二层是储层的深层，渗透性较低，从1500 m到约3100 m深度的温度为350° C到360°C。第三层是热传导区。在WD-1a井中，热液对流区和更深的热传导区之间的过渡在3100 m深度处。
The New Energy and Industrial Technology Development Organization (NEDO) drilled well WD-1a between 1994 and 1995 in the Kakkonda geothermal field as part of their Deep Seated Geothermal Resources Survey project. High-temperature measurements were carried out in WD-1a. Logging temperatures above 414°C were confirmed at 3600 m and 3690 m depth after 82 h standing time. Simple Horner extrapolations based on observed temperatures up to 82 h after shut-in suggested a temperature of about 500°C at 3500 m depth. Temperatures between 500°C and 510°C were also confirmed at 3720 m depth after 129–159 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 1500 m depth, at 230°C to 260°C. The second layer is a deep zone of the reservoir, which is less permeable and has a temperature of 350°C to 360°C from 1500 m to about 3100 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 3100 m depth in well WD-1a.