Neo-tectonic fracturing after emplacement of quaternary granitic pluton in the Kakkonda geothermal field, Japan
Neo-tectonic fracturing after emplacement of quaternary granitic pluton in the Kakkonda geothermal field, Japan
复制标题
日本 Kakkonda 地热田第四纪花岗岩体侵位后的新构造断裂
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
K. Ishikawa
中科院分区：
文献类型：
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作者：
N. Doi;O. Kato;S. Kanisawa;K. Ishikawa
卡康达地热系统中发生的裂缝是中更新世至近代新花岗岩（第四纪卡康达花岗岩）侵位后的新构造应力作用下形成的。约1.5 km处的渗透率特征差异强烈地受到接触变质带的控制，特别是堇青石和较高品位的变质带，在这些变质带中形成了高温（320{°C<）和低渗透的深层储层。 5口2.5-3.0公里深的地热井表明，-1.0公里以下的微震区渗透率较高，特别是在Kakkonda花岗岩边缘，而微震区以外的渗透率较低。 Kakkonda 花岗岩是一种复合岩体，内部裂缝很少。因此，新构造断裂在非变质第三纪地层和 Kakkonda 花岗岩边缘发育。
The fracture which occurs in the Kakkonda geothermal system was formed by neo-tectonic stress after the emplacement of the neo-granite (Quaternary Kakkonda Granite) at middle Pleistocene to recent. The characteristic contrast in permeability at ca.1.5 km is strongly controlled by the contact metamorphic zone, especially cordierite and higher grade metamorphic zones, in which the high temperature (320{degrees}C<) and low permeable deep reservoir was created. The five geothermal wells 2.5-3.0 km deep have clarified that a microearthquake zone below -1.0 km shows high permeability especially at the margin of the Kakkonda Granite, and low permeability outside of a microearthquake zone. The Kakkonda Granite is a composite pluton which has very few fractures inside of it. Thus, neo-tectonic fracturing has developed in the non-metamorphosed Tertiary formations and the margin of the Kakkonda Granite.