Thermal reservoir modeling and resource assessment of deep high-temperature geothermal resources in sedimentary basins

Abstract

Deep high-temperature geothermal resources in sedimentary basins represent a promising source of clean energy with immense potential. The key to unlocking this potential lies in the precise identification of economically viable reservoirs and development sites. The Jiyang Depression boasts favorable geothermal conditions; however, its complex structural systems, deeply buried hot dry rocks, and pronounced heterogeneity pose significant challenges for resource exploitation. These challenges necessitate a transition from broad-scale resource assessments to refined analyses of thermal reservoirs. This study employs three-dimensional thermal reservoir modeling to quantify the multi-scale spatial distribution of key evaluation parameters, systematically characterize reservoir physical properties, accurately estimate regional geothermal resource potential, and optimize well placement and drilling strategies. Results identify the southern slope belt of the Jiyang Depression as the most extensive high-temperature zone, with temperatures reaching up to 210 °C at 5000 m depth. The Wangjiagang area, specifically the region between Well Guan 9 and Well Wang 661, stands out as the optimal site for Enhanced Geothermal System well placement. Reservoir analysis further reveals that the carbonate reservoirs from the Badou to Zhangxia Formations possess the highest geothermal resource potential, while the Xuzhuang to Mantou Formations demonstrate superior thermal-electric conversion efficiency for hot dry rock reservoirs. Additionally, the dolomites from the Yeli to Fengshan Formations and the shales of the Xuzhuang Formation exhibit excellent characteristics as hot dry rock reservoirs. These findings provide a robust scientific foundation and practical guidance for developing high-temperature geothermal resources.