摘要：Granite-basin geothermal systems show promise as renewable resources for heat and potential electricity production. Nevertheless, a deeper understanding of their structural relationships and heat accumulation patterns is crucial for enhancing the exploration and evaluation of their energy potential. The intricate granite-basin structure evident on the surface of the Pearl River Delta (PRD) in South China poses significant challenges and uncertainties for deep geothermal exploration. To offer a deeper understanding, we introduce a comprehensive three-dimensional (3-D) lithospheric-scale structural model of the PRD, leveraging gravity anomaly and other geophysical data. Subsequently, utilizing this model as a foundation, we successfully derived the three-dimensional steady-state conductive thermal field of the crust through numerical simulation techniques. Our findings reveal that the deep fault zones control the morphology of basins and intrusions. The model indicates that the granite has an average thickness of approximately 3.5 km, whereas the region proximate to Hong Kong and Macau exhibits the greatest thickness (～12 km). In forward modeling, the presence of significant gravity anomalies that cause challenges in accurately fitting within the Sanshui Basin and littoral region are attributed to basaltic intrusions located within the lower crust. The measured data reveals that the granites in the PRD have a high radiogenic heat production rate (average > 5 μW/m3). The thermal simulation result shows that the subsurface high-temperature areas are predominantly concentrated within the Sanshui Basin, Xinhui Basin, and Yunkai Massif. Notably, the surface heat flow exhibits considerable fluctuations, ranging from 68 and 122 mW/m2, with granitic intrusions contributing as much as 48%. This study reveals that mantle heat serves as the primary controlling factor in the thermal field. Moreover, over half of the regions examined possess the capability to generate high-temperature geothermal resources. ? 2024 Elsevier Ltd

ISSN号：0375-6505

卷、期、页：卷127

发表日期：2025-03-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Geothermics

通讯作者：廖珂琰

第一作者：邱楠生,冯乾乾,朱传庆,江强

论文类型：期刊论文

论文概要：廖珂琰,邱楠生,冯乾乾,朱传庆,江强，Crustal structure and deep geotherm of the Pearl River Delta in South China: Insights from gravity and thermal modeling，Geothermics，2025，卷127

论文题目：Crustal structure and deep geotherm of the Pearl River Delta in South China: Insights from gravity and thermal modeling