以熱動力學模式探討地熱潛能區之地下水資源的路徑及評估其儲集層溫度

Application The Thermodynamic Modeling on The Groundwater Flow Path and Evaluate Temperature of the Reservoir in Geothermal Potential Area

江家榕(Chia-Jung Chiang) ； 劉佳玫(Chia-Mei Liu) ； 郭欽慧(Ching-Huei Kuo) ； 蔡裕偉(Yu-Wei Tsaia)

《農業工程學報》 63卷1期 (2017/03) Pp. 22-34

https://doi.org/10.29974/JTAE.201703_63(1).0004

摘要

本研究為國內首次以熱動力學模式探討地熱潛能區之地下水資源路徑並評估其儲集層溫度之文章，目前是全世界新興的技術。本研究區位於宜蘭平原、宜蘭平原南側山麓及清水地熱。本研究結果顯示，宜蘭平原東側屬於含鈣濃度較高碳酸氫水體，宜蘭山麓地帶屬於含鈉濃度較高碳酸氫水體，清水地熱的水體屬於碳酸氫鈉泉。以多成份地質溫度計估算地熱儲集層溫度時，宜蘭平原儲集層溫度為31°C-96°C，宜蘭平原南側山麓儲集層溫度為31°C-91°C，清水地熱儲集層溫度為151°C-248°C。一般而言，多成份地質溫度計是用來估算地熱儲集層之溫度，從本研究中利用多成份地質溫度計，除了能估算地熱儲集層的溫度之外，這個方法還能快速得知所採集的水體受到現今水體的影響程度。

關鍵字

熱動力學 ； 地熱潛能 ； 儲集層溫度 ； 宜蘭 ； 地下水

並列摘要

In Taiwan, this study first apply thermodynamic model on groundwater flow path and evaluate temperature of the reservoir in geothermal potential area. We collected groundwater and hot spring samples from Ilan Plain, the southern foothill area of Ilan Plain and Chingshui geothermal area for chemical and isotopic analysis. The results of this study shows that the waters belong to Ca-HCO_3 in the western Ilan Plain, and other waters are Na-HCO_3 in the eastern Ilan Plain. The oxygen and hydrogen stable isotope of waters close to the meteoric water line of northeastern Taiwan in Ilan Plain and south foothill area of Ilan Plain, and the waters far away the meteoric water line in the Chingshui geothermal field. Finally, this study applies the multicomponent geothermometer on modeling flow path and evaluating the reservoir temperature. The estimated reservoir temperatures are 31-96°C, 31-91°C and 151-248°C in the southern foothill of Ilan Plain and Chingshui geothermal area, respectively. The results of the multicomponent geothermometer of this study with chemical analysis demonstrate that this geothermometer not only can estimate the reservoir temperature but also may implicate the fluid flow path.

並列關鍵字

Thermodynamics ； Geothermal potential area ； Reservoir temperature ； Ilan Plain ； Groundwater