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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71603

    Title: 宜蘭三星地熱地下構造探勘;Exploration of the geothermal structures in Sansing, Ilan
    Authors: 鍾陳東;Chung,Chen-Tung
    Contributors: 地球科學學系
    Keywords: 宜蘭平原;反射震測;地熱;地球物理探勘;Ilan Plain;Reflection Seismic;Geothermal Energy;Geophysical Exploration
    Date: 2016-06-15
    Issue Date: 2016-10-13 13:21:51 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 宜蘭平原位於台灣的東北方,琉球隱沒系統中沖繩海槽的最西端,介於雪山山脈地質區和中央山脈地質區之間,上面覆蓋未固結的第四紀沉積物。宜蘭地區具有高的地溫梯度與多處溫泉,可能是鄰近山區之變質岩殘餘熱或沖繩海槽弧後擴張的火成活動所影響。本研究利用震測探勘法來探究大尺度的宜蘭平原、中尺度的蘭陽溪河兩岸和再連地區的地下構造,目的在於探測宜蘭三星地區高的地熱潛能。
    ;The Ilan Plain in northeast Taiwan is located at the southwestern tip of the Okinawa Trough, which extends westward into the Taiwan orogeny. The Ilan Plain covered by thick sediments is clipped by the Hsuehshan Range in the northwest side and the Central Range in the south side. High geothermal gradients with plenteous hot springs of this area may result from magmatism associated with the back-arc spreading of the Okinawa Trough. In this study, we use geophysical methods to explore underground structures in the whole Ilan Plain, especially around the LangYang river and the SanShin area. We aim to find high geothermal potential spots in the plain area.
    The research is divided into three parts. First, we use explosion sources with 119 Texan instruments to detect velocity structures by tomography mapping. Second, we use two mini-vibrators to investigate the area along the LangYang river by reflection seismics. Third, we explore a significant fault by refraction seismics and semi-reflection seismics with the impactor source. Finally, we combine with other geophysical and drilling data to analyze, compare and explain the high geothermal gradients in this area.
    The shallow part of Ilan Plain can be divided into three layer: 800 m/s for alluvial deposit, 3000 m/s for Kanko formation, 5700 m/s for Szeleng sandstone. The thickness of each layer are 100~800m, 800m, and 800m, respectively. From seismic survey, there is a Zailian fault with an offset of at least 1000m, along the north bank of LangYang river. After comparing with the drilling data around Sansing area, we find that the Taiyaqiao anticline in Hsuehshan Range has entered the Sansing area and is bounded by the Zhuoshui fault (south) and the Zailian fault (north). According to the report of the HCL-1 well, the formations predicted by seismic method agree well with the drill results. However, the temperature in HCL-1 well is only 70.7℃ at the 2200m deep. The low temperature may be due to the Szeleng sandstone which has very limited fractures. The geothermal reservoir system might be controlled by faults, instead of lithology. The heat sources from the magmatism formed in the upper mantle/ lower crust may come from the Ryukyu backarc system. The magma migrates into the Ilan Plain along the Lanyang river. Meteoric water flowing underground from the Hsuehshan Range to the Ilan Plain gets its temperature heated by the intruded igneous hot rock. The fault systems provide the paths of heat migrating into the shallow parts of the Ilan Plain, which may cause the high geothermal gradients in this plain area.
    Appears in Collections:[地球物理研究所] 博碩士論文

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