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Study on Prospecting of Geothermal Reservoir by Seismic Noise Method.

地震噪声法勘探地热藏研究。

基本信息

批准号：
61550456
负责人：
SAITO Tokumi
金额：
$ 1.22万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550456/
关键词：
Geothermal reservoir Geophysical prospecting 地熱微動微動

项目摘要

A Seismic noise survey was carried out in the Takinoue (Kakkonda) geothermal area, Iwate prefecture. 80 survey points are included in an area 6Km wide along the EW direction and 3Km long along the NS direction, centered in the Takinoue hot spring, and 40 survey points on measuring line between the Takinoue and Matsukawa geothermal areas. The relation between noise amplitude, distribution of dominant frequency and geothermal activity was investigated. The results are summarised as follows.1). Large amplitudes of seismic noise are observed in an area centered in the recent development zone and surrounded by Shironuma, the point half-way of the mountaineering path of Mitsuishiyama, the entrance to Kakkonda forest road, and south Shirasawa. The frequency of 5-15Hz is dominant in this area. On the otherhand, very small amplitudes of seismic noise are distributed to the south-east side of the Takinoue tunnel, the entrance to mountaineering path of Hiragakuranuma, and the downstream of Kakkonda river. The seismic noise in the frequency band 0.8-0.5Hz, which is dominant in this area, is considered to constitute the microseisms.2) Activities of fumaroles and hot springs are recognised at the area showing loarge amplitudes. It seems that the zone of generation of seismic noise is shallower than the geothermal reservoir.3). The seismic noise in the frequency band 2-15Hz is generated by the stream of steam and hot water going upwards form deeper reservoir to the surface.

在岩手县Takinoue（Kakkonda）地热区进行了地震噪声调查。在以泷上温泉为中心的东西向沿着6 km宽，南北向沿着3 km长的区域内，包括80个测点，在泷上和松川地热区之间的测量线上包括40个测点。研究了噪声幅值、主频分布与地热活动的关系。结果总结如下：1）。在最近开发区的中心，被白沼、三石山登山路线的中途点、Kakkonda森林道路的入口和白泽南部所包围的地区，观察到了大幅度的地震噪音。5- 15 Hz频率在该区占主导地位。另一方面，在Takinoue隧道的东南侧、Hiragakuranuma登山路径的入口和Kakkonda河的下游，地震噪声的振幅非常小。在0.8-0.5Hz频带内的地震噪声是该区的主要地震噪声。2）在振幅较大的区域，可识别出洞穴和温泉活动。地震噪声的产生带似乎比地热噪声的产生带浅。2- 15 Hz频带的地震噪声是由蒸汽和热水从较深的储层向上流到地面而产生的。