华南珠江三角洲地壳结构与深部地热：来自重力和热模拟的启示

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2024-12-24 DOI:10.1016/j.geothermics.2024.103245

Keyan Liao , Nansheng Qiu , Qianqian Feng , Chuanqing Zhu , Qiang Jiang

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引用次数: 0

摘要

花岗岩盆地地热系统有望成为供热和潜在电力生产的可再生资源。然而，更深入地了解它们的结构关系和热积累模式对于加强它们的能量潜力的探索和评价至关重要。华南珠江三角洲表层复杂的花岗岩盆地构造给深部地热勘探带来了巨大的挑战和不确定性。为了提供更深入的理解，我们利用重力异常和其他地球物理数据，引入了珠江三角洲岩石圈尺度的综合三维（3-D）结构模型。随后，以该模型为基础，通过数值模拟技术成功推导出地壳三维稳态导电热场。研究结果表明，深断裂带控制着盆地和侵入体的形态。该模型表明，花岗岩的平均厚度约为3.5 km，而靠近香港和澳门的地区厚度最大（约12 km）。在正演模拟中，三水盆地及沿岸地区存在明显的重力异常，这给精确拟合带来了挑战，原因是位于下地壳的玄武岩侵入。实测资料表明，珠江三角洲花岗岩具有较高的放射性成因产热率(平均>；5μW / m3)。热模拟结果表明，地下高温区主要集中在三水盆地、新会盆地和云开地块内。值得注意的是，地表热流表现出相当大的波动，范围在68和122 mW/m2之间，花岗岩侵入贡献高达48%。研究表明，地幔热是热场的主要控制因素。此外，在审查的地区中，有一半以上具有生产高温地热资源的能力。

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

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.

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.