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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >Subsurface Structure in Oita Hot Spring Area Inferred from Gravity Data, Eastern Kyushu, Japan
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Subsurface Structure in Oita Hot Spring Area Inferred from Gravity Data, Eastern Kyushu, Japan

机译：从大雄春天区域，从重力数据，日本东部的重力数据推断

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The sustainability of hot springs in Japan has not been thoroughly explored. Only a few geochemical and geophysical surveys were conducted to interpret the subsurface structure of hot spring sites because of financial restrictions set by hot spring owners. This results in the depletion or drawdown of the hot spring water. For sustainable utilization of hot springs, it is important to understand the hydrothermal systems governing the hot spring activity. The hot spring area in the Oita plain, eastern Kyushu, Japan, contains many non-volcanic low-temperature hot spring wells. Some of them were formed by fluid extracted in the subduction of the Philippine Sea Plate. Such hot springs are rare in Japan; therefore, their hydrothermal system is not well known. Details of the subsurface structure are necessary to understand the hydrothermal system and to construct a hydrothermal model. This study outlines the shallow underground fault system and basement structure of the Oita hot spring area. Gravity surveys were conducted to understand the relationship between the low-temperature hydrothermal systems and the geophysical data of the area. Using data of dense gravity surveys of the Oita plain, we obtained a detailed Bouguer anomaly map and modelled the subsurface structure. Inversion analysis was performed using three-dimensional gravity analysis. The location and dip of the faults were clearly identified and the subsurface model was obtained. Based on our results and those of previous studies, a hot springs conceptual model of the hydrothermal system of the Oita plain hot springs was constructed.
机译：日本温泉的可持续性尚未彻底探索。由于温泉所有者设定的金融限制，仅进行了几种地球化学和地球物理调查以解释热泉站点的地下结构。这导致热泉水的耗尽或缩减。为了可持续利用温泉，重要的是要理解控制热弹簧活性的水热系统。日本九州东部的大分平原的温泉区包含许多非火山低温温泉井。其中一些是通过在菲律宾海底俯冲中提取的流体形成的。在日本，这种温泉很少见;因此，它们的水热系统是众所周知的。地下结构的细节是理解水热系统的必要和构建水热模型。本研究概述了大分炎热弹簧区域的浅地下故障系统和地下室结构。进行重力调查以了解该地区的低温水热系统与地球物理数据之间的关系。使用大分平原的密集重力调查数据，我们获得了详细的Bouguer异常地图并建模了地下结构。使用三维重力分析进行反演分析。清楚地识别出故障的位置和倾向，并获得了地下模型。基于我们的结果和先前研究的结果，构建了大分普通温泉水热系统的温泉概念模型。

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