近年來為響應全球淨零碳排趨勢，臺灣積極推動再生能源發展，其中地熱能因具備穩定基載電力特性而備受重視。臺南關子嶺地區除擁有豐富的溫泉資源外，亦有多處天然氣與熱水湧出，顯示地底下蘊含活躍的地熱系統。然而此區域近地表地層主要由中新世晚期至更新世早期的頁岩或泥質砂岩組成，地層基質的孔隙率與滲透率隨著深度增加而顯著降低，使得地熱流體的移棲與儲存必須仰賴構造運動所產生的「裂隙系統」。由於關子嶺地區地質構造發達，受枕頭山斷層、六重溪斷層以及連續褶皺構造（如前大埔向斜、南寮背斜）影響，裂隙發育程度成為評估地熱儲集層效益的關鍵，故本研究選擇此地作為研究區域，旨在探討裂隙分布特徵及其對流體傳輸之影響。
本研究使用商業軟體Pix4Dmatic將以智慧型手機拍攝的野外露頭影像，轉換為高密度三維點雲，過程中使用到運動回復結構 (Structure from Motion, SfM) 與多視立體 (Multi-view Stereo, MVS) 等技術。前者透過多張高重疊度影像計算相機位置與姿態並生成稀疏點雲，後者則補強細節以生成密集點雲。相較於傳統人工測量或近景影像測量 (CRDP)，此方法突破了地形陡峭與露頭可及性之限制，具備更高的機動性與效率。之後利用開源程式Discontinuity Set Extractor（DSE）對密集點雲進行半自動不連續面辨識，提取裂隙之位態與密度等資訊。經對比DSE辨識結果及野外實地量測的裂隙資訊，顯示雙方結果高度一致，但DSE能提供更為全面且具統計代表性的數據，故以DSE辨識結果為主進行離散裂隙模擬及區域應力歷史解釋。最終，離散裂隙模擬使用開源程式ADFNE進行，將裂隙參數轉化為三維離散裂隙網路（DFN）模型，並計算線裂隙強度P10與體積裂隙強度P32以評估連通性。研究結果揭示了部分區域具備高強度正交裂隙網路與優異的等效裂隙孔隙率，期能透過此裂隙發育特性之解析，了解地下流體通道機制，為後續關子嶺地區地熱資源開發提供科學依據。

To support Taiwan's net-zero carbon goals, this study investigates the geothermal potential of the Guanziling area in Tainan, where abundant hot springs and gas seepages indicate an active subsurface system. Because the local Late Miocene to Early Pleistocene stratigraphy consists of low-permeability shale and muddy sandstone, geothermal fluid storage and transport rely heavily on fracture systems formed by regional tectonic activity, including the Zhentoushan and Liuchongxi faults.
To overcome the limitations of steep terrain, this research employed smartphone-based photogrammetry and Pix4Dmatic software, utilizing Structure from Motion (SfM) and Multi-view Stereo (MVS) to generate high-density 3D point clouds. The Discontinuity Set Extractor (DSE) was then used to semi-automatically extract fracture attitudes and density, providing more comprehensive data than traditional manual surveys. Finally, these parameters were integrated into the ADFNE program to construct 3D Discrete Fracture Network (DFN) models.
The results reveal specific zones with high-intensity orthogonal fracture networks and an equivalent fracture porosity of 2.0% to 2.5%. By elucidating these subsurface fluid pathways, this study provides a critical scientific basis for future geothermal resource development in the Guanziling region.

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