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On the study of comprehensive airborne survey system for geothermal structure

地热结构综合机载测量系统研究

基本信息

批准号：
07555613
负责人：
MOGI Toru
金额：
$ 1.98万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555613/
关键词：
airborne survey Electromagnetic survey magnetic survey infrared images geothermal exploration 地熱調査

项目摘要

We conducted fundamental study for improving the depth of investigation, resolving ability and accuracy of airborne electromagnetic, magnetic and infrared image survey aiming at practical application for a geothermal survey. The study was carried out to investigate practically some issues through field survey using helicopter at some geothermal fields. The major results of each method was indicated as follows.As for the airborne electromagnetic, we developed instrument and data processing method of grounded electrical source airborne electromagnetic to increase the depth of investigation up to several kilometers. To observe magnetic response of the ground in the air, we developed high accuracy flux-gate magnetometer. The fiber optic gyros attached to the attitude measurement equipment was used to measure pitch and roll of the magnetometer, which were using collection of the motion of magnetometer. We obtained expected data using practical set up in the field test survey.We improved proton magnetometer to detect small magnetic field change due to geothermal structure with the airborne magnetic survey. We also developed the method measuring vertical gradient of the field. To increase the accuracy, we developed new circuit for exciting strong proton signal. And we contrived a circuit to adjust timing of measurement between magnetic and electromagnetic methods.To improve the accuracy of estimating heat discharge using airborne infrared image, we investigated characteristics of the data obtained in the air in comparison with surface data. We also developed data processing method for wide data.

针对地热调查的实际应用，为提高机载电磁、磁力和红外成像测量的探测深度、分辨率和精度进行了基础性研究。本研究通过直升机在地热田的实地考察，对一些问题进行了实地调查。每种方法的主要成果如下：对于机载电磁，我们研制了接地电源机载电磁的仪器和数据处理方法，将探测深度增加到几公里。为了观测地面在空气中的磁场响应，我们研制了高精度磁通门磁力仪。姿态测量设备上安装了光纤陀螺，用于测量磁强计的俯仰和滚转，采集磁强计的运动。在野外试验测量中，利用实际布设获得了预期的数据。改进了质子磁强计，使之能够探测由于地热结构而产生的微小磁场变化。我们还发展了一种测量场地垂直梯度的方法。为了提高测量精度，我们研制了一种激发强质子信号的新电路。为了提高利用机载红外热像仪估算热流量的精度，我们研究了空气中的数据与地面数据的特性。我们还开发了适用于大范围数据的数据处理方法。