彰雲平原區之地溫分布及溫泉蘊藏推估

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標題:	彰雲平原區之地溫分布及溫泉蘊藏推估 Subsurface Temperature in Changhua and Yunlin and Assessment of hot spring resource, Taiwan
作者:	林沼吟
貢獻者:	觀光事業管理系陳文福
關鍵字:	濁水溪沖積扇溫度井測地溫溫泉 Well temperature measurement Subsurface temperature Hot spring Choshui alluvial fan
日期:	2016
上傳時間:	2016-12-21 15:36:06 (UTC+8)
摘要:	地溫指地面下的溫度，具有三維空間分布並隨時間改變的性質。地溫的量測通常經由鑽井的井孔溫度（borehole temperature）所得。井孔溫度可反應地底下之岩層（固定）及地下水（可流動）的溫度。臺灣位於板塊交接帶上，地熱資源豐富，地下溫度通常會隨深度增加。台灣的沉積岩區蘊藏著大量熱的地下水，許多地區的水質皆符合溫泉標準，若同時水溫大於30°C即為溫泉資源。本研究旨在調查彰雲平原地區的井溫，經由調查井的井孔溫度得出地溫分布狀況，以推估溫泉之蘊藏。本研究選擇經濟部水利署於民國80-86年間在彰雲沖積扇及八卦斗六丘陵所建之地下水觀測站中最深的67口觀測井量測井孔溫度。量測方法將美國In-situ 公司troll 200測棒放進入地下水面後，每間隔5 m測量一點水溫數據，每點停留至少2 min，量測時由上往下量一次，利用內差法將調查所得到的原始數據換算成間隔每一公尺的地溫，繪製出不同深度的等溫圖，藉以瞭解不同深度的地溫水平分布，再利用外差法推估達到30°C的井溫所需深度。研究發現地溫的水平分布情形為扇頂區溫度較低，推測應為地下水補注源頭；扇尾區溫度較高，推測此處的地下水流動性不佳，或過度抽取地下水使下部較熱的地下水往上流，因此造成溫度異常升高。在溫泉蘊藏推估方面，依地溫梯度推估達到溫泉標準的水溫所需鑿井深度及其空間分布為扇頂區大多需大於300 m 深，扇尾區200 m 深以內即能達到溫泉標準所規定的水溫。 The subsurface temperature distribution is important for hot spring exploration. Subsurface temperature is usually obtained by measuring the borehole temperature, which is assuming had reached the balance of rock and groundwater and usually increase with the depth. The purpose of this research is to investigate the subsurface temperature in Changhua and Yunlin plain, central Taiwan. The temperature measuring device is In-situ Troll 200 which was put into the monitoring wells downward for every 5 meters with stay 2 minute for reaching the temperature balance. I analyze the temperature data gathered from the deepest 67 wells constructed by Water Resources Agency from 1991 to 1997 in the study area. The 3D distribution of surface temperature is constructing from raw data by using interpolation. The depths of large than 30?C, according to the Taiwan Hot Spring Law's standard to be a legally hot spring, in the monitoring wells are identified. The result will show the distribution of subsurface temperature larger than 30?C that may be good for exploration for hot spring resource. The results show that the lowest subsurface temperature is located at the upper fan recharge area of the Choshuichi alluvial fan and the higher temperature is in the lower fan. I suggested that the lower fan's higher temperature was caused by over pumping of the shallow groundwater that forced the deeper and warmer groundwater flowed upward. For hot spring exploration in the Changhua and Yunlin plain, at least 300m depth is required in the upper fan and 100-200m depth in the lower fan.
關聯:	學年度：104，94頁
显示于类别:	[觀光事業管理系(含溫泉所)] 博碩士論文

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