LN2处理后受热花岗岩孔隙结构变化：强化地热能提取的实验研究

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2025-03-20 DOI:10.1016/j.geothermics.2025.103326

Sotirios Nik. Longinos , Mohammad Asif , George Mathews

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引用次数: 0

摘要

本文对两种花岗岩样品进行了低温压裂，对其孔隙进行了表征，以加强地热能的提取。样品最初加热到600°C，随后进行液氮（LN2）处理，进行多次冷冻和冻融循环。汞侵入作用和低压氮吸附作用显示了花岗岩孔隙特征的显著变化。经LN2处理后，氮气吸附量由1.08 cc/g提高到1.52 cc/g。该研究还研究了孔隙体积的显著增加，孔隙体积增加了135 - 152%。此外，对花岗岩样品进行了XRD分析，研究了花岗岩样品中矿物的微观影响。样品1的XRD分析表明，LN 2处理增强了样品的孔隙连通性，样品1的长石和黑云母含量较高。相比之下，样品2由于石英含量高，压裂效果有限。因此，加热花岗岩样品的低温压裂具有研究孔隙结构改变以提高地热能采收率的巨大潜力。这项研究为推进地热能开采建立了一个基本框架，并有助于哈萨克斯坦可再生能源的发展。

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Pore structure alteration in heated granite after LN2 treatment: An experimental study for the enhanced geothermal energy extraction

The cryogenic fracturing of two granite samples was performed in this paper for the pore characterization to enhance geothermal energy extraction. The samples were heated initially to 600 °C and subsequently analyzed for liquid nitrogen (LN₂) treatment for multiple freezing and freezing-thawing cycles. The mercury intrusion and low-pressure nitrogen adsorption reveal a significant alternation in the pore characteristics of granite samples. The nitrogen adsorption capacity increases from 1.08 cc/g to 1.52 cc/g after LN₂ treatment. This study also examines a significant increase in pore volume as pore volume increases by 135–152 %. Furthermore, the XRD analysis of the samples was executed to study the microscopic effect of the minerals in the granite samples. The LN₂ treatment of the sample enhances pore connectivity, as evidenced by the XRD analysis of sample 1, which reveals a high feldspar and biotite content. In contrast, sample 2 experiences limited fracturing effects due to its high quartz content. Therefore, the cryogenic fracturing of heated granite samples demonstrates significant potential for investigating pore structure modifications to improve geothermal energy recovery. This study establishes a fundamental framework for advancing geothermal energy extraction and contributes to the development of renewable energy in Kazakhstan.

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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.