在地熱場域中，透過地質溫度計從地表熱液預測深部儲集層的溫度，已被廣泛的運用，如SiO2、Na/K地質溫度計等。然而，運用在不同岩性的地熱系統，地質溫度計往往獲得不一致或是偏差大的預測值，使得可信度面臨重大的挑戰，也強調多重地質溫度計互相驗證的重要性。本研究針對Na-Li元素在熱液系統相對穩定的化學特性，系統性地分析文獻資料、數據收集及討論影響Na-Li地質溫度計的因素。我們的結果顯示：岩性與熱液來源為影響流體log(Na/Li)最顯著的因素。因此，本研究針對台灣的地質岩性、熱液來源，發展出適用的Na-Li地質溫度計： T (℃) = 1000/ (0.50 (±0.02) log(Na/Li) +1.26(±0.04))-273.15 (r²= 0.7725, n = 223)。
其中，Na/Li單位為莫耳濃度，適用溫度範圍從33至300℃。新的Na-Li地質溫度計，透過清水地熱實測溫度的驗證，偏差為±5 %內；相比於文獻所提出地質溫度計偏差可高達±20%，預測精確度大幅提升。經過模型迴歸後，也證實岩性以及熱液起源是一個重要的影響。本研究進一步將新的Na-Li地質溫度計用於預測中崙與關子嶺的儲集層溫度；結果顯示中崙與關子嶺溫度分別為120-140℃及140℃，誤差為±4℃。此外，Na-Li地質溫度計受到天水混染導致偏差的程度較Na-K溫度計輕微，僅最濕季樣品表現出異常值。根據Mg/Na vs. Ca/Na、Giggenbach Na-K與K-Mg地質溫度計、氫氧同位素、Na/K及Na/Li進行水化學特徵分析，僅最濕季樣品化學特徵為天水，其餘log(Na/Li)保持恆定，證明Na-Li地質溫度計相對傳統常用的Na-K溫度計較不會受到乾、濕季的影響。本研究成果指出，Na-Li地質溫度計為可靠的地質溫度計，可作為SiO2、Na-K地質溫度計交互驗證的工具，以提升從地表熱液預測儲集層溫度的精確度與可信度。

In geothermal fields, geothermometers have been widely used to estimate reservoir temperatures from the chemistry of hot-spring surface fluids, such as SiO2 and Na-K geothermometers. However, when applied to geothermal systems with heterogeneous lithologies, geothermometers often yield inconsistent temperatures or exhibit significant bias. This study systematically analyzes reference data, sampling methods, and the influencing factors of the Na/Li geothermometer in geothermal fluids. Our results show that lithology and fluid origin are the most critical controlling factors. Therefore, we establish a regression-derived Na–Li geothermometer specifically adapted to the lithologies and fluid origins of the Taiwan orogenic belt: T (℃) = 1000/ (0.50 (±0.02) log(Na/Li) +1.26(±0.04))-273.15 (r²= 0.7725, n = 223).
Here, the Na/Li ratio is expressed in molar concentration, and the applicable temperature range is 33—300℃ with Cl- ≤ 0.55 M. The new Na-Li geothermometer, validated by measured temperatures in the Chingshui geothermal field, shows deviations within ±5%. It was further applied to predict reservoir temperatures in the Chunglun and Kuantzuling areas, yielding 120—140℃ and ~140℃, respectively. Based on the analysis of water chemistry, particularly the Mg/Na versus Ca/Na ratios, the Giggenbach ternary Na-K-Mg diagram, and hydrogen and oxygen isotopes, it is evident that the water undergoes significant mixing with meteoric water during the wet periods. This mixing results in the loss of chemical characteristics that typically define geothermal waters. Interestingly, despite this, the Na/Li ratios remain constant throughout the seasons. The results demonstrate that the Na-Li geothermometer is reliable and can be used alongside SiO2 and Na-K geothermometers to improve the accuracy and credibility of reservoir temperature predictions from surface fluids.

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