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Direct Exploration of Geothermal Reservoir by Mise-a-la-masse Method

Mise-a-la-masse法直接勘探地热藏

基本信息

批准号：
61550467
负责人：
USHIJIMA Keisuke
金额：
$ 0.96万
依托单位：
Kyushu 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-61550467/
关键词：
The mise-a-la-masse method Line source of current Casing pipe of well Geothermal resources Geothermal reservoir Electrical resistivity 物理探査法差分近似法鉱体流電法物理探査

项目摘要

The mise-a-la-masse method was firstly applied to the geothermal investigations by the present authors in Japan. The method using a casing pipe as a current electrode inside or nearby a conductive mass, then the established potential distribution of ground surface is measured similarly with the self potential method. This study has been designed and improved to prospect a conductive body like a geothermal reservoir directly by taking notice of the high contrast of resistivities between the geothermal resources and the surrounding formations. The present study stars from the tank model experiments in the laboratory, through numerical simulation by the electronic computer, and reach to the actual field application to the geothermal area. In the numerical calculation, the surface responses has been obtained by the finite difference method with different locations of a line source of current electrode over the various models.The field survey was carried out using a casing pipe of HT-8 well … More in the well known geothermal area in the Hatchobaru in order to delineate the geothermal reservoirs. The measurement produced the sharply contoured residual anomaliesdue to high contrast of resistivities among the geothermal fluid, hydrothermally altered zones and surrounding formations. The contour maps derived from the data processing clearly indicated several promissing low resistivity zones of interest, including the present production zone of 55 MW capacity where the almost all of productive wells located in.It was confirmed that the apparent resistivity contour map obtained by the mise-a-la-masse method showed a good correlation with the low resistivity layer distribution derived from the inversion analysis of the Schlumberger resistivity and the magneto-telluric (MT) surveys made in the same zones of Hatchoburu geothermal area. The similarities between the mise-a-la-masse result and the interpreted result from the surface geophysical methods are striking in particular of the data over the present production zone in the Hatchobaru geothermal field.It is concluded that the mise-a-la-masse method can be adequately applied to the geothermal investigations while the method has been used for the ore prospecting in the mining industry. Less

Mise-a-la-Masse方法在日本首次应用于地热调查。该方法使用套管作为导电物质内部或附近的电流电极，然后与自然电位法类似地测量地面已建立的电位分布。这项研究的设计和改进是通过注意到地热资源与周围地层之间的高对比度来直接勘探地热储之类的导电体。本研究从实验室的储罐模型实验出发，通过电子计算机的数值模拟，达到了在地热区的实际现场应用。在数值计算中，用有限差分方法得到了不同模型下不同位置的电流源的表面响应，现场测量是以…井的一根套管为例更多的是在Hatchobaru众所周知的地热区，以圈定地热储。由于地热流体、热液蚀变带和周围地层之间的高电阻率对比度，测量产生了轮廓清晰的残余异常。数据处理得到的等高线图清楚地显示了几个有希望的低电阻层，包括目前产能为55兆瓦的生产区，几乎所有的生产井都在那里。经证实，Mise-a-la-Masse方法获得的视电阻率等高线与在哈乔布鲁地热区同一地区进行的斯伦贝谢电阻率和大地电磁(MT)测量的反演分析得到的低阻层分布具有很好的相关性。MISE-A-MASSE方法的结果与地表地球物理方法解释的结果有很大的相似性，特别是在Hatchobaru地热田现今产区的数据上。因此，MISE-A-MASSE方法可以很好地应用于地热调查，而该方法已被用于矿业找矿。较少